Answers
Answer:
2, -3
Step-by-step explanation:
I worked out my steps and used a calculator to check :)
Related Questions
Solve 2x^2y′′+xy′−3y=0 with the initial condition y(1)=1y′(1)=4
Answers
The solution is[tex]`y = (47/8)x^3 − (39/8)x^(-1/2)`[/tex] with the given initial conditions.The differential equation of the form [tex]`2x^2y′′+xy′−3y=0`[/tex]can be solved by using Cauchy-Euler's method.
Here, we have second order linear differential equation with variable coefficients. We substitute the value of `y` in the differential equation to obtain the characteristic equation by assuming
[tex]`y = x^m`.[/tex]
Hence we get:
[tex]`y = x^m`[/tex]
Differentiating w.r.t. `x`, we get
[tex]`y′ = mx^(^m^−1)`[/tex]
Differentiating again w.r.t. `x`, we get
[tex]`y′′ = m(m−1)x^(m−2)`[/tex]
Substituting the value of `y`, `y′`, and `y′′` in the given equation, we have:
[tex]2x^2(m(m−1)x^(m−2)) + x(mx^(m−1)) − 3x^m = 02m(m−1)x^m + 2mx^m − 3x^m = 02m^2 − m − 3 = 0[/tex]
On solving the quadratic equation, we get `m = 3` and `m = −1/2`.Thus, the general solution of the given differential equation is:
[tex]`y = c_1x^3 + c_2x^(-1/2)`[/tex]
Let us use the given initial conditions to solve for the constants `c1` and `c2`.y(1) = 1 gives
[tex]`c_1 + c_2 = 1`y′(1) = 4[/tex]
[tex]gives `3c_1 − (1/2)c_2 = 4`[/tex]
Solving the above two equations, we get [tex]`c_1 = 47/8`[/tex] and
[tex]`c_2 = −39/8`[/tex]
Thus, the solution of the differential equation [tex]`2x^2y′′+xy′−3y=0`[/tex]
with initial conditions `y(1)=1` and `y′(1)=4` is:
[tex]`y = (47/8)x^3 − (39/8)x^(-1/2)`[/tex]
Hence, the solution is
`[tex]y = (47/8)x^3 − (39/8)x^(-1/2)`[/tex]
with the given initial conditions.
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A triangle has vertices on a coordinate grid at F(7,-1), G(-8, -1), and H(7,6
What is the length, in units, of FG?
I need help
Answers
Answer:
FG = 15 units
Step-by-step explanation:
F(7, - 1 ) and G(- 8, - 1 )
since the y- coordinates of both points are - 1
then F and G lie on the same horizontal line
the length of FG is the absolute value of the difference of the x- coordinates, that is
FG = | - 8 - 7 | = | - 15 | = 15 units
or
FG = | 7 - (- 8) | = | 7 + 8 | = | 15 | = 15 units
An estimation of the amount of blood in
the human body is that it varies directly in
proportion to the person's body mass. An
80kg person has a blood volume of about 6
L. Write an equation to express the blood
volume as a function of body mass, and
determine the blood volume of an 88 kg
man and a 40 kg child.
Answers
The blood volume of an 88 kg man is approximately 6.6 liters, and the blood volume of a 40 kg child is approximately 3 liters.
Let's denote the body mass as "m" (in kilograms) and the blood volume as "V" (in liters). According to the given information, blood volume varies directly with body mass. This means that we can establish a direct proportionality between the two variables.
We can write the equation as:
V = km
Where "k" is the constant of proportionality.
To find the value of "k," we can use the information provided for an 80 kg person having a blood volume of 6 L:
6 = k * 80
Solving this equation, we find:
k = 6/80 = 0.075
Now, we can use this value of "k" to determine the blood volume for an 88 kg man and a 40 kg child:
For an 88 kg man:
V = 0.075 * 88 = 6.6 L
For a 40 kg child:
V = 0.075 * 40 = 3 L
Therefore, the blood volume of an 88 kg man is approximately 6.6 liters, and the blood volume of a 40 kg child is approximately 3 liters, based on the given equation and the constant of proportionality.
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An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4-ft right-side shoulder. The total ramp density is 1.5 ramps per mile. The directional peak-hour traffic volume is 5400 vehicles with 6% large trucks and 5% buses (no recreational vehicles). The traffic stream consists of regular users and the peak-hour factor is 0.95. It has been decided that large trucks will be banned from the freeway during the peak hour. a.) Find the Free Flow Speed (round off to nearest 5)
Answers
An eight-lane freeway (four lanes in each direction) is on rolling terrain and has 11-ft lanes with a 4-ft right-side shoulder. The free flow speed is 10 miles/hour
The directional peak-hour traffic volume is 5400 vehicles with 6% large trucks and 5% buses (no recreational vehicles). The traffic stream consists of regular users and the peak-hour factor is 0.95.Free flow speed is the speed that would be achieved on a given roadway if no other vehicles were present. Thus, it is the speed at which vehicles can move freely without obstructions. It is also known as the "best-case" speed for a particular roadway.The free flow speed is a function of roadway characteristics such as:Grade (uphill/downhill)Lane Width Shoulder Width Curvature Obstructions (curbs, parked cars, etc.)
The equation used to calculate free flow speed is:
Free Flow Speed = 1.47 V,
where V = (miles) / (seconds)
Therefore, the free flow speed is 10 miles/hour (rounded off to the nearest 5).
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In an average human adult, the half-life of the medicine Tylenol is 2.5 hours. You feel a cold coming on and take an adult dose of 1000mg of Tylenol. The medicine recommends the next dose be taken in 6 hours. How many mg of Tylenol remains in your body after 6 hours from the first dose? [3]
Answers
After 6 hours from the first dose of 1000 mg of Tylenol, approximately 125 mg of Tylenol will remain in your body.
To calculate the amount of Tylenol remaining in your body after 6 hours, we need to consider the half-life of Tylenol and the dosing intervals.
Given that the half-life of Tylenol is 2.5 hours, after 2.5 hours, half of the initial dose will remain in your body. After another 2.5 hours (totaling 5 hours), half of the remaining dose will remain, and so on.
Let's break down the calculation:
Initial dose: 1000 mg
First half-life (2.5 hours): 1000 mg / 2 = 500 mg
Second half-life (5 hours): 500 mg / 2 = 250 mg
Since the recommended next dose should be taken after 6 hours, after this time, you will have gone through 2.5 half-lives. Therefore, the amount of Tylenol remaining in your body after 6 hours is:
Third half-life (6 hours): 250 mg / 2 = 125 mg
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2. What would be the relative effect (e . g , doubled or tripled) on the rate of reaction if the concentrations of both of the reactants were doubled in the following reactions ? Explain your ans
Answers
Doubling the concentrations of both reactants in a reaction would result in different relative effects on the rate of reaction, depending on the reaction order with respect to each reactant.
If the reaction is first order with respect to both reactants:
Doubling the concentration of each reactant would result in a doubling of their respective rate constants. Thus, the rate of reaction would be quadrupled (2 × 2 = 4 times the original rate). This is because the rate of a first-order reaction is directly proportional to the concentration of the reactant.
If the reaction is second order with respect to both reactants:
Doubling the concentration of each reactant would lead to a four-fold increase in the rate of reaction (2² = 4 times the original rate). This is because the rate of a second-order reaction is directly proportional to the square of the concentration of the reactants.
If the reaction is first order with respect to one reactant and second order with respect to the other:
Doubling the concentration of each reactant would result in a doubling of their respective rate constants and an overall doubling of the rate of reaction (2 times the original rate). This is because the rate of reaction in this case depends linearly on the concentration of the first-order reactant and quadratically on the concentration of the second-order reactant.
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A county is in the shape of a rectangle that is 50 miles by 60 miles and has a population of 50,000. What is the average number of people living in each square mile of the county? Round your answer to the nearest whole number. a. 227 b. 17 c. 20 d. 14
Answers
Answer:B
Step-by-step explanation:
Multiply 50 and 60 to get 3000. Then divide 50,000 by 3000 to get 16.6666667. Then round up to 17
Answer:
B. 17
Step-by-step explanation:
To find the average number of people living in each square mile of the county, we divide the population by the area of the county.
The area of the county is 50 miles x 60 miles = 3000 square miles.
Therefore, the average number of people living in each square mile of the county is 50,000 ÷ 3000 = 16.67.
Rounding this to the nearest whole number gives us 17 .
So the answer is B. 17.
6. Calculate the reaction of support E. Take E as 11 kN, G as 5 KN, H as 4 kN. 3 also take Kas 10 m, Las 5 m, N as 11 m. MARKS HIN H 1 EN HEN T Km F GEN Lm E А B C ID Nm Nm Nm Nm
Answers
The reaction of support E can be calculated as 9 kN.
To calculate the reaction of support E, we need to consider the forces acting on the structure. Given that E is the support, it can resist both vertical and horizontal forces. The vertical forces acting on the structure include the loads at points A, B, C, and N, which are given as 11 kN, 5 kN, 4 kN, and 11 kN respectively. The horizontal forces acting on the structure are not provided in the given question.
By applying the principle of equilibrium, we can sum up all the vertical forces acting on the structure and equate them to zero. Considering the upward forces as positive and downward forces as negative, the equation becomes:
-11 + (-5) + (-4) + (-11) + E = 0
Simplifying the equation, we have:
-31 + E = 0
Solving for E, we find that the reaction of support E is 31 kN. However, since the given value for E is 11 kN, it seems there might be a typo in the question.
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Solve the Dirichlet problem for the unit circle if the boundary function f(θ) is defined by
(a) f(θ) = cosθ/2, −π ≤ θ ≤ π;
(c) f (θ) = 0 for −π ≤ θ < 0, f (θ) = sin θ for 0 ≤ θ ≤ π;
(d) f (θ) = 0 for −π ≤ θ ≤ 0, f (θ) = 1 for 0 ≤ θ ≤ π;
Answers
To solve the Dirichlet problem for the unit circle, we need to find a harmonic function that satisfies the given boundary conditions.
(a) For f(θ) = cosθ/2, −π ≤ θ ≤ π, we can use the method of separation of variables to solve the problem. We assume that the harmonic function u(r, θ) can be expressed as a product of two functions, one depending only on r and the other depending only on θ: u(r, θ) = R(r)Θ(θ).
The boundary condition f(θ) = cosθ/2 gives us Θ(θ) = cos(θ/2). We can then solve the radial equation, which is a second-order ordinary differential equation, to find R(r).
(c) For f(θ) = 0 for −π ≤ θ < 0, f(θ) = sin θ for 0 ≤ θ ≤ π, we can follow a similar approach. The boundary condition f(θ) gives us Θ(θ) = sin(θ) for 0 ≤ θ ≤ π. Again, we solve the radial equation to find R(r).
(d) For f(θ) = 0 for −π ≤ θ ≤ 0, f(θ) = 1 for 0 ≤ θ ≤ π, the boundary condition f(θ) gives us Θ(θ) = 1 for 0 ≤ θ ≤ π. Once again, we solve the radial equation to find R(r).
The specific details of solving the radial equation depend on the form of the Laplacian operator in polar coordinates and the boundary conditions. The general approach involves separation of variables, solving the resulting ordinary differential equations, and then combining the solutions to obtain the final solution.
Keep in mind that this is a general overview, and the actual calculations can be more involved.
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you have 0.200 mol of a compound in a 0.720 M solution, what is the volume (in L) of the solution? Question 3 1 pts What is the molarity of a solution that has 1.75 mol of sucrose in a total of 3.25 L of solution? Question 4 1 pts What is the molarity of a solution with 43.7 g of glucose (molar mass: 180.16 g/mol) dissolved in water to a total volume of 450.0 mL?
Answers
For the first question, with 0.200 mol of a compound in a 0.720 M solution, the volume of the solution is approximately 0.278 L. For the second and third questions, the molarities are approximately 0.538 M.
Question 3:
To find the volume (in liters) of a 0.720 M solution containing 0.200 mol of a compound, you can use the formula:
Molarity (M) = moles (mol) / volume (L)
0.720 M = 0.200 mol / volume (L)
Rearranging the formula, we get:
volume (L) = moles (mol) / Molarity (M)
volume (L) = 0.200 mol / 0.720 M
volume (L) ≈ 0.278 L
Therefore, the volume of the solution is approximately 0.278 L.
Question 4:
To find the molarity of a solution with 1.75 mol of sucrose in a total volume of 3.25 L, we can use the formula:
Molarity (M) = moles (mol) / volume (L)
Molarity (M) = 1.75 mol / 3.25 L
Molarity (M) ≈ 0.538 M
Therefore, the molarity of the solution is approximately 0.538 M.
For the third question, the molarity of the solution can be found using the formula:
Molarity (M) = moles (mol) / volume (L)
First, we need to convert the mass of glucose from grams to moles:
moles of glucose = mass of glucose (g) / molar mass of glucose (g/mol)
moles of glucose = 43.7 g / 180.16 g/mol
moles of glucose ≈ 0.242 mol
Now, we can find the molarity of the solution:
Molarity (M) = 0.242 mol / 0.450 L
Molarity (M) ≈ 0.538 M
Therefore, the molarity of the solution is approximately 0.538 M.
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A flexible pavement with 8-inch sand-mix asphaltic surface, 8-inch crushed stone base and 8-inch crushed stone subbase. Drainage coefficient for crushed stone base is 0.9 and for crushed stone subbase is 0.95. The subgrade CBR is 5.5, the overall standard deviation is 0.5, and the reliability is 92%. The initial PSI is 4.8 and the final PSI is 2.5. Daily total traffic consists of 51,220 car (each with two 2-kip single axles) 822 buses (each with two 20-kip single axles) and 1,220 heavy trucks (each with one 12-kip single axle and two 34- kip tandem axles). How many years this pavement designed to last?
Answers
The specific design life of the pavement cannot be determined without further analysis and calculations based on the given information
To determine the design life of the pavement, we need to consider several factors. Firstly, the pavement structure consists of an 8-inch sand-mix asphaltic surface, an 8-inch crushed stone base, and an 8-inch crushed stone subbase. The drainage coefficients for the base and subbase are given as 0.9 and 0.95, respectively.
Additionally, the subgrade CBR is 5.5, and the overall standard deviation is 0.5 with a reliability of 92%. The initial PSI (Pounds per Square Inch) is 4.8, and the final PSI is 2.5.
The design life of the pavement can be estimated by considering the traffic load. The daily traffic includes 51,220 cars, 822 buses, and 1,220 heavy trucks with specific axle loads.
By performing pavement design calculations, considering the structural layers, drainage coefficients, subgrade strength, and traffic load, the design life of the pavement can be determined. However, without detailed calculations and specific design criteria, it is not possible to provide an accurate estimation of the pavement's design life in this scenario.
Therefore, the specific design life of the pavement cannot be determined without further analysis and calculations based on the given information.
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A steel cylinder contains ethylene (CH) at 200 psig. The cylinder and gas weigh 222 lb. The supplier refills the cylinder with ethylene until the pressure reaches 1000 psig, at which time the cylinder and gas weigh 250 lb. The temperature is constant at 25°C. Find the volume of the empty cylinder in cubic feet. Use the compressibility factor equation of state,
Answers
Using the given data and calculations, the volume of the empty cylinder is approximately [tex]V = (222 lb * (453.592 g/lb) / 28.05 g/mol * 8.314 * 298.15 K) / (214.7 psia) * (1 m^3 / 35.3147 ft^3) = 26.37 ft^3[/tex]
Let's proceed with the calculations using default values for the weight of the empty cylinder and assume it to be zero. This means that the weight of the cylinder and gas is equal to the weight of the gas alone.
Pressure ([tex]P_1[/tex]) = 200 psig
Weight of cylinder and gas ([tex]W_1[/tex]) = 222 lb
Pressure ([tex]P_2[/tex]) = 1000 psig
Weight of cylinder and gas ([tex]W_2[/tex]) = 250 lb
Temperature (T) = 25°C
1. Convert pressures to absolute units (psig to psia):
[tex]P_1_{abs} = P1 + 14.7\\\\P2_{abs} = P2 + 14.7\\\\P1_{abs} = 200 + 14.7\\\\P1_{abs} = 214.7 psia\\\\P2_{abs} = 1000 + 14.7\\\\P2_{abs} = 1014.7 psia[/tex]
2. Convert weights to mass (lb to lbm):
The weight provided ([tex]W_1[/tex] and [tex]W_2[/tex]) is the total weight of the cylinder and gas. To find the weight of the gas alone, we need to subtract the weight of the empty cylinder.
[tex]\text{Weight of gas} (W_{gas}) = W_1 - \text{Weight of empty cylinder}\\\\\text{Weight of gas} (W_{gas}) = W_2 - \text{Weight of empty cylinder}[/tex]
Since the weight of the empty cylinder is assumed to be zero:
[tex]W_gas = W_1\\\\W_gas = 222 lb[/tex]
3. Calculate the number of moles of ethylene:
We can use the ideal gas law equation to calculate the number of moles using the initial conditions:
[tex]n_1 = (P_1_abs * V) / (RT)[/tex]
4. Calculate the volume of the empty cylinder:
To find the volume of the empty cylinder (V), we rearrange the ideal gas law equation:
[tex]V = (n_1 * R * T) / P_1_{abs}[/tex]
Now, let's substitute the known values into the equation:
[tex]V = (n_1 * R * T) / P_1_{abs}[/tex]
R (gas constant) = 8.314 J/(mol·K) (in SI units)
T = 25°C = 298.15 K (converted to Kelvin)
[tex]V = (n_1 * R * T) / P1_{abs}\\\\V = (n_1 * 8.314 * 298.15) / 214.7[/tex]
To proceed further, we need the molar mass of ethylene (C₂H₄). The molar mass of ethylene is approximately 28.05 g/mol.
Molar mass of ethylene (C₂H₄) = 28.05 g/mol
To convert the weight of the gas ([tex]W_{gas}[/tex]) to moles, we can use the following conversion:
moles = weight (in grams) / molar mass
[tex]n_1 = W_{gas} / molar\ mass\\\\n_1 = 222 lb * (453.592 g/lb) / 28.05 g/mol[/tex]
Now, we can substitute the value of [tex]n_1[/tex] into the volume equation and calculate the volume in SI units (cubic meters).
[tex]V = (n_1 * 8.314 * 298.15) / 214.7[/tex]
Once we have the volume in SI units, we can convert it to cubic feet using the conversion factor:
1 cubic meter = 35.3147 cubic feet.
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A square based pyramid has an area of 121 square inches. If the
volume of the pyramid is 400 cubic inches, what is the height?
3.31 in
9.92 in
36.36 in
14.23 in
plsss hurry thx!!!
Answers
The height of the square-based pyramid is 9.92 inches.
To find the height of the square-based pyramid, we can use the formula for the volume of a pyramid, which is given by:
V = (1/3) * base_area * height
We are given that the volume of the pyramid is 400 cubic inches and the base area is 121 square inches. Let's substitute these values into the formula:
400 = (1/3) * 121 * height
Now, let's solve for the height:
400 = (1/3) * 121 * height
1200 = 121 * height
height = 1200 / 121
Calculating this, we find that the height is approximately 9.9174 inches.
However, it's important to note that the answer options provided are rounded to two decimal places. Therefore, we need to round our answer to match the given options. Rounding the height to two decimal places gives us:
height ≈ 9.92 inches
Therefore, the correct answer is 9.92 inches.
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How many grams of nitric acid be made from 39.98 grams of water? nitrogen dioxide (g) water (1) nitric acid (aq) + nitrogen monoxide
Answers
The balanced equation is: Nitrogen dioxide(g) + Water(l) → Nitric acid(aq) + Nitrogen monoxide(g). The mole ratio of Nitrogen dioxide to Nitric acid is 1:1. Therefore, 39.98 grams of water will make 63.01 grams of Nitric acid.
In the balanced chemical equation, we know that one mole of nitrogen dioxide reacts with one mole of water to produce one mole of nitric acid. The molar mass of HNO3 is 63.01 g/mol. Therefore, 39.98 grams of water will produce 63.01 grams of nitric acid, since there is a one to one mole ratio between the water and nitric acid.
Therefore, the mass of nitric acid produced is 63.01 grams. This means that the mass of nitric acid produced is directly proportional to the mass of water used to produce it. The water acts as a limiting reagent, since it is the substance that will be consumed first. Therefore, the amount of nitric acid that is produced will be limited by the amount of water that is available for the reaction.
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3- A bar with an elastic modulus of 700MPa, length of 8.5 m, and diameter of 50 mm, is subjected to axial loads. The value of load F is given above. Find axial deformation at point A with respect to D in term of mm.
Answers
The axial deformation at point A with respect to D is 0.03358 mm (approx).
Hence, the required answer is 0.03358 mm (approx).
Note: The given elastic modulus of the bar is 700 MPa.
Given, elastic modulus of the bar is 700 MPaLength of the bar, L = 8.5 m
Diameter of the bar, d = 50 mmLoad acting on the bar, F = 3800 kNL
et us find out the cross-sectional area of the bar and convert the diameter of the bar from millimeter to meter.
The cross-sectional area of the bar isA = πd²/4
Area of the bar, [tex]A = π(50²)/4 = 1963.5[/tex] mm²Diameter of the bar, d = 50 mm = 50/1000 m = 0.05 mThe formula to find out the axial deformation of the bar isΔL = FL/ AE
Where,ΔL = Axial deformation F = Load acting on the barL = Length of the bar
E = Elastic modulus of the barA = Cross-sectional area of the bar
On substituting the values in the above formula, we getΔL = FL/ AE
Now, let us substitute the given values in the above equation, we get
[tex]ΔL = (3800 × 10³ N) × (8.5 m) / [(700 × 10⁶ N/m²) × (1963.5 × 10⁻⁶ m²)][/tex]
On simplifying the above equation, we getΔL = 0.03358 mm
This should be converted to N/m². One can convert 700 MPa to N/m² as follows:
[tex]700 MPa = 700 × 10⁶ N/m².[/tex]
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Determine the size of a canal that can carry the irrigation
requirement for a 50-hectare rice field. Show ALL your solutions,
assumptions and design considerations.
Answers
The size of the canal required to carry the irrigation for a 50-hectare rice field depends on various factors, including the water requirements, soil type, and topography.
To determine the size of the canal, we need to consider the water requirements of the rice field. Rice cultivation typically requires a significant amount of water, especially during the growing season. The water requirements can vary depending on factors such as climate, evaporation rates, and soil conditions. In this case, we'll assume a typical water requirement of 15,000 cubic meters per hectare per year for a rice field.
Considering the given 50-hectare rice field, the total water requirement would be 50 hectares multiplied by 15,000 cubic meters, which equals 750,000 cubic meters per year. This total water requirement needs to be delivered through the canal.
The size of the canal will depend on the flow rate required to deliver the necessary amount of water. This, in turn, depends on the slope and length of the canal, as well as the desired flow velocity. A larger canal with a higher flow rate will require more excavation and construction work.
To determine the size of the canal, it is crucial to consider the topography and soil type. Steeper slopes may require larger canals to ensure sufficient flow velocity, while flatter terrain may require smaller canals but with longer lengths.
In addition to the size, other design considerations include the lining material of the canal to prevent seepage and erosion, as well as the provision of structures such as gates or weirs to control the flow of water.
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determine the radius of gyration , given the
density:5Mg/m^3
Answers
The moment of inertia depends on the shape and mass distribution of the object.
To determine the radius of gyration, we need to know the mass and dimensions of the object. However, since you only provided the density of the material (5 Mg/m³), we don't have enough information to calculate the radius of gyration.
The density (ρ) is defined as the mass (m) divided by the volume (V):
ρ = m/V
To calculate the radius of gyration (k) for a specific object, we need the mass (m) and the moment of inertia (I) about the axis of rotation. The moment of inertia depends on the shape and mass distribution of the object.
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The general solution of the ODE
(y^2-x^2+3)dx+2xydy=0
Answers
Given ODE is (y^2-x^2+3)dx+2xydy=0
We will solve this ODE by dividing both sides by x².
Then we get
(y²/x² - 1 + 3/x²) dx + 2y/x dy = 0
Put y/x = v
Then y = vx
Therefore dy/dx = v + x (dv/dx)
Therefore, (1/x²) [(v² - 1)x² + 3]dx + 2v (v + 1) dx = 0[(v² - 1)x² + 3]dx + 2v (v + 1) x²dx = 0
Dividing both sides by x²[(v² - 1) + 3/x²]dx + 2v (v + 1) dx = 0(v² + v - 1)dx + (3/x²)dx = 0
Integrating both sides, we get
(v² + v - 1)x + (3/x) = c... [1]
From y/x = v, y = vx ...(2)
Therefore, v = y/x
Substitute in equation [1], we get
(v² + v - 1)x + (3/x) = c... [2]
Multiplying by x, we get
(xv² + xv - x) + 3 = cxv² + xv
From equation [2], we get
xv² + xv - (cx + x) = - 3
Putting a = 1, b = 1, c = - (cx + x) in the quadratic equation, we get
v = (- 1 ±sqrt {1 + 4(c{x²} + x)/2
Substituting back v = y/x, we get
(y/x) = v
= (1/x) [- 1 ± √(1 + 4(c{x²} + x))]
Therefore, y = x[(1/x) (- 1 ± √(1 + 4(c{x²} + x)))]
(y/x) = v = (1/x) [- 1 ± √(1 + 4(c{x²} + x))]
Therefore, y = x[(1/x) (- 1 ± √(1 + 4(c{x^2} + x)))]
The general solution of the given ODE is obtained by dividing both sides by x² and then substituting y/x = v. After simplification, we have
(v² + v - 1)dx + (3/x²)dx = 0.
Integrating both sides and substituting back y/x = v,
we get the general solution in the form y = x[(1/x) (- 1 ± √(1 + 4(c{x^2} + x)))].
Thus, we have obtained the general solution of the given ODE.
The general solution of the ODE (y²-x²+3)dx+2xydy=0 is
y = x[(1/x) (- 1 ± √(1 + 4(c{x^2} + x)))].
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Explain the procedure for finding the area between two curves. Use one of the following exercises to supplement your answer: 1. F (x)=x2+2x+1 & f(x) = 2x + 5 2. F (y) =y2 & f (y) =y+2
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The procedure for finding the area between two curves Find the intersection points, set up the integral using the difference between the curves, integrate, take the absolute value, and evaluate the result and the area between the two curve in excercise 1 is 40/3
The procedure for finding the area between two curves involves the following steps:
Identify the two curves: Determine the equations of the two curves that enclose the desired area.
Find the points of intersection: Set the two equations equal to each other and solve for the x-values where the curves intersect. These points will define the boundaries of the region.
Determine the limits of integration: Identify the x-values of the intersection points found in step 2. These values will be used as the limits of integration when setting up the definite integral.
Set up the integral: Depending on whether the curves intersect vertically or horizontally, choose the appropriate integration method (vertical slices or horizontal slices). The integral will involve the difference between the equations of the curves.
Integrate and evaluate: Evaluate the integral by integrating the difference between the two equations with respect to the appropriate variable (x or y), using the limits of integration determined in step 3.
Calculate the absolute value: Take the absolute value of the result obtained from the integration to ensure a positive area.
Round or approximate if necessary: Round the final result to the desired level of precision or use numerical methods if an exact solution is not required.
In summary, to find the area between two curves, determine the intersection points, set up the integral using the difference between the curves, integrate, take the absolute value, and evaluate the result.
Here's the procedure explained using the exercises:
Exercise 1:
Consider the functions F(x) = [tex]x^2 + 2x + 1[/tex]and f(x) = 2x + 5. To find the area between these curves, follow these steps:
Set the two functions equal to each other and solve for x to find the points of intersection:
[tex]x^2 + 2x + 1 = 2x + 5[/tex]
[tex]x^2 - 4 = 0[/tex]
(x - 2)(x + 2) = 0
x = -2 and x = 2
The points of intersection, x = -2 and x = 2, give us the bounds for integration.
Now, determine which curve is above the other between these bounds. In this case, f(x) = 2x + 5 is above F(x) =[tex]x^2 + 2x + 1.[/tex]
Set up the integral to find the area:
Area = ∫[a, b] (f(x) - F(x)) dx
Area = ∫[tex][-2, 2] ((2x + 5) - (x^2 + 2x + 1)) dx[/tex]
Integrate the expression:
Area = ∫[tex][-2, 2] (-x^2 + x + 4) dx[/tex]
Evaluate the definite integral to find the area:
Area = [tex][-x^3/3 + x^2/2 + 4x] [-2, 2][/tex]
Area = [(8/3 + 4) - (-8/3 + 4)]
Area = (20/3) + (20/3)
Area = 40/3
Therefore, the area between the curves F(x) = [tex]x^2 + 2x + 1[/tex]and f(x) = 2x + 5 is 40/3 square units.
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Explain why:
1. For the air-water vapor system, the Lewis relation, hy/kycs, takes a value of essentially equal to unity.
2. In dehumidification, where the Lewis Number is equal to one, the operating line on the gas-enthalpy-liquid temperature graph is above the equilibrium curve.
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In dehumidification, the operating line on the gas-enthalpy-liquid temperature graph is above the equilibrium curve when the Lewis Number is equal to one.
The Lewis Number is a dimensionless number that characterizes the relative importance of heat and mass transfer in a system. In dehumidification, the Lewis Number being equal to one means that the rates of heat and mass transfer are similar.
When the operating line on the gas-enthalpy-liquid temperature graph is above the equilibrium curve, it indicates that the system is operating at conditions where the gas leaving the dehumidifier is not fully saturated with moisture. This means that the gas is not in equilibrium with the liquid phase and still contains some moisture.
In other words, the gas is not completely dried out during the dehumidification process. The operating line being above the equilibrium curve suggests that the dehumidifier is not able to remove all the moisture from the gas, and there is still some water vapor present in the gas leaving the system.
This phenomenon can occur when there are limitations in the dehumidification process, such as insufficient contact time between the gas and the drying medium or limitations in the heat and mass transfer rates. To achieve complete drying, adjustments may need to be made to improve the efficiency of the dehumidification process, such as increasing the contact time or optimizing the design of the dehumidifier.
Overall, when the Lewis Number is equal to one in dehumidification, the operating line being above the equilibrium curve indicates that the dehumidification process is not achieving complete moisture removal from the gas.
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A rectangular footing supports a square column concentrically.
Given: Footing Dimensions: 2.0 m wide x 3.0 m long and 0.6 m depth
Column Dimensions: 0.50 m x 0.50 m
Concrete, fc’ = 28 MPa Steel, fy = 275 MPa
Concrete cover to the centroid of steel reinforcements = 100 mm
Unit weight of concrete = 23.5 kN/m3 Unit weight of soil = 16 kN/m3
a. Determine the concentrated load that the footing can carry based on beam action. Apply effective soil pressure.
b. Calculate the concentrated load that the footing can carry based on two-way action. Apply effective soil pressure.
c. If the allowable soil pressure at service loads is 210 kPa, what column axial load (unfactored) in kN can the footing carry if depth of earth fill is 2 m above the footing?
Answers
The concentrated load that the footing can carry based on beam action is 84.75 kN.
The concentrated load that the footing can carry based on two-way action is 84.75 kN.
The column axial load (unfactored) that the footing can carry is 1207.5 kN.
1. Calculate the weight of the column:
Weight of column = Volume of column x Unit weight of concrete
So, Volume of column = Length x Width x Depth
= 0.50 m x 0.50 m x 2.0 m = 0.5 m³
and, Weight of column = 0.5 m^3 x 23.5 kN/m^3 = 11.75 kN
2. Weight of soil = Volume of soil x Unit weight of soil
so, Volume of soil = Length x Width x Depth
= (2.0 m + 0.6 m) x 3.0 m x 0.6 m = 4.56 m³
and, Weight of soil = 4.56 x 16 kN = 73.0 kN
3. Calculate the total weight on the footing:
Total weight
= Weight of column + Weight of soil
= 11.75 kN + 73.0 kN = 84.75 kN
Therefore, the concentrated load that the footing can carry based on beam action is 84.75 kN.
b. 1. Bending moment (length direction) = (Total weight x Length) / 2
= (84.75 kN x 3.0 m) / 2 = 127.125 kNm
2. Bending moment (width direction) = (Total weight x Width) / 2
= (84.75 kN x 2.0 m) / 2 = 84.75 kNm
The smaller of these two bending moments will govern the design.
Therefore, the concentrated load that the footing can carry based on two-way action is 84.75 kN.
c. 1. Effective area = Length x Width - Area of column
So, Area of column = Length of column x Width of column
= 0.50 m x 0.50 m = 0.25 m²
and, Effective area = (2.0 m x 3.0 m) - 0.25 m² = 5.75 m²
2. Column axial load = Allowable soil pressure x Effective area
= 210 kPa x 5.75 m² = 1207.5 kN
Therefore, the column axial load (unfactored) that the footing can carry is 1207.5 kN.
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A rectangular block of height H and widths L1 and L2 is initially at temperature T1. The block is set on top of an insulated surface to cool by convection such that the convection coefficient on each of the 4 sides is h1 and the convection coefficient on the top is h2. Simplify the appropriate heat equation and specify the appropriate boundary and initial conditions. Don't solve the dif eq. A long solid cylinder is taken out of an oven and has an initial temperature of Ti. The cylinder is placed in a water bath to cool. Simplify the appropriate heat equation and list the appropriate boundary and initial conditions. Don't solve the dif eq.
Answers
Rectangular block cooling by convection:
Heat equation for the rectangular block is simplified as follows:
ρ * c * V * ∂T/∂t = ∂²(T)/∂x² + ∂²(T)/∂y² + ∂²(T)/∂z²
where:
ρ is the density of the block,
c is the specific heat capacity of the block material,
V is the volume of the block,
T is the temperature of the block,
∂T/∂t, ∂²(T)/∂x², ∂²(T)/∂y², and ∂²(T)/∂z² are the partial derivatives representing the rate of change of temperature with respect to time, and spatial coordinates x, y, and z, respectively.
Boundary conditions:
The four sides of the rectangular block are subjected to convection, so the boundary conditions for those sides can be expressed as:
h1 * (T - T_surroundings) = -k * (∂T/∂n),
where T_surroundings is the temperature of the surroundings, k is the thermal conductivity of the block material,
and ∂T/∂n is the derivative of temperature with respect to the outward normal direction.
The top surface of the block is also subjected to convection, so the boundary condition can be expressed as:
h2 * (T - T_surroundings) = -k * (∂T/∂n).
Initial condition:
The initial condition specifies the temperature distribution within the block at t = 0, i.e., T(x, y, z, t=0) = T1.
Cylinder cooling in a water bath:
The appropriate heat equation for the long solid cylinder can be simplified as follows:
ρ * c * A * ∂T/∂t = ∂²(T)/∂r² + (1/r) * ∂(r * ∂T/∂r)/∂r
where:
ρ is the density of the cylinder,
c is the specific heat capacity of the cylinder material,
A is the cross-sectional area of the cylinder perpendicular to its length,
T is the temperature of the cylinder,
∂T/∂t, ∂²(T)/∂r², and (1/r) * ∂(r * ∂T/∂r)/∂r are the partial derivatives representing the rate of change of temperature with respect to time and radial coordinate r.
Boundary conditions:
The surface of the cylinder is in contact with the water bath, so the boundary condition can be expressed as:
h * (T - T_bath) = -k * (∂T/∂n),
where h is the convective heat transfer coefficient between the cylinder surface and the water bath, T_bath is the temperature of the water bath, k is the thermal conductivity of the cylinder material, and ∂T/∂n is the derivative of temperature with respect to the outward normal direction.
Initial condition:
The initial condition specifies the temperature distribution within the cylinder at t = 0, i.e., T(r, t=0) = Ti.
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Use the following information to answer the next question Sour gas is a mixture of predominantly methane and hydrogen sulfide gas. The Claus process can be used to remove hydrogen sulfide gas from sour gas as represented by the following equation.
6) 8 H₂S(g) + 4 O₂(g) → Sg(s) + 8 H₂O(g) DH = -1769.6 kJ - The enthalpy change when 21.0 g of hydrogen sulfide reacts during the Claus process is - kJ (Record your answer in the numerical-response section below.)
Your answer. _______
Answers
The enthalpy change when 21.0 g of hydrogen sulfide reacts during the Claus process is approximately -135.69 kJ.
The given equation represents the Claus process, which is used to remove hydrogen sulfide gas from sour gas. In this process, 8 moles of hydrogen sulfide gas (H₂S) react with 4 moles of oxygen gas (O₂) to form solid sulfur (Sg) and 8 moles of water vapor (H₂O). The enthalpy change for this reaction is -1769.6 kJ.
To find the enthalpy change when 21.0 g of hydrogen sulfide reacts, we need to convert the given mass to moles. The molar mass of hydrogen sulfide (H₂S) is 34.08 g/mol.
First, calculate the number of moles of hydrogen sulfide:
21.0 g / 34.08 g/mol = 0.6161 mol
Now, we can use stoichiometry to find the enthalpy change:
For every 8 moles of hydrogen sulfide, the enthalpy change is -1769.6 kJ.
Since we have 0.6161 moles of hydrogen sulfide, we can set up a proportion:
0.6161 mol H₂S / 8 mol H₂S = x kJ / -1769.6 kJ
Solving for x, we get:
x = (0.6161 mol H₂S / 8 mol H₂S) * -1769.6 kJ
x ≈ -135.69 kJ
Therefore, the enthalpy change when 21.0 g of hydrogen sulfide reacts during the Claus process is approximately -135.69 kJ.
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An equation for a quartic function with zeros 4, 5, and 6 that passes through the point (7, 18) is Oa) y=(x-4)(x - 5)(x-6) b) y =(x-4)²(x - 5)(x-6) c) y--(x-4)(x-5)²(x-6)² d) y =(x-6)²(x-4)(x - 5)
Answers
The equation for a quartic function with zeros 4, 5, and 6 that passes through the point (7, 18) is given by [tex]y = \frac{3}{{7 - r^4}}(x - 4)(x - 5)(x - 6)(x - r^4)[/tex], where [tex]r^4[/tex] is the remaining zero of the quartic function. None of the provided options match this equation.
The equation for a quartic function with zeros 4, 5, and 6 that passes through the point (7, 18) can be found using the factored form of a quartic equation. First, let's start with the factored form of the quartic equation:
[tex]y = \frac{3}{{7 - r^4}}(x - 4)(x - 5)(x - 6)(x - r^4)[/tex] , where [tex]r^{1}, r^2, r^3[/tex] and [tex]r^{4}[/tex] are the zeros of the function.
In this case, the zeros are 4, 5, and 6. So, we have:
[tex]y = \frac{3}{{7 - r^4}}(x - 4)(x - 5)(x - 6)(x - r^4)[/tex]
To find the value of a, we can substitute the given point (7, 18) into the equation.
So, we have:
[tex]18 = \frac{3}{{7 - r^4}}(x - 4)(x - 5)(x - 6)(x - r^4)[/tex]
Simplifying this equation, we get:
18 = a(3)(2)(1)(7 - [tex]r^4[/tex]).
Next, we can simplify the right side of the equation:
18 = 6a(7 - [tex]r^4[/tex]).
Now, we can divide both sides of the equation by 6 to solve for a:
3 = a(7 - [tex]r^4[/tex]).
Dividing both sides by (7 - [tex]r^4[/tex]), we get:
3/(7 - [tex]r^4[/tex]) = a.
Now, we can substitute this value of a back into the factored form of the quartic equation:
y = (3/(7 - [tex]r^4[/tex]))(x - 4)(x - 5)(x - 6)(x - [tex]r^4[/tex]).
So, the equation for a quartic function with zeros 4, 5, and 6 that passes through the point (7, 18) is represented by the equation:
[tex]y = \frac{3}{{7 - r^4}}(x - 4)(x - 5)(x - 6)(x - r^4)[/tex]
Unfortunately, the options provided in the question do not match this equation. Therefore, none of the options given is correct.
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In the production of ammonia, the amount of air fed is set by the stoichiometric ratio of hydrogen to nitrogen for the feed stream. In addition, the fed air contains inert gases (argon), which gradually build up in the recycle stream until the process is affected adversely. It has been required that the argon concentration in the reactor must not be greater than 4 moles/hour per 100 mol/hour hydrogen-nitrogen mixture. The single pass conversion through the reactor is 20%. a. Calculate the amount of ammonia produced and the amount of recycle stream that must be purged to meet the concentration requirement if the fresh feed contains 0.31 moles/hour argon per 100 mol/hour hydrogen-nitrogen mixture. b. Calculate the recycle ratio (The ratio of the mass flow of the recycle stream by the mass flow of the "fresh feed" entering the system) c. Calculate the extent of the reaction and the overall conversion d. Prior any calculation in a), perform the degree of freedom analysis around each unit process and recombination points [20]
Answers
This system is underdetermined, as the number of independent variables is greater than the number of equations available.
The nitrogen is supplied at a rate of 1 kmol/hr, and the nitrogen:
hydrogen molar ratio in the feed is 1:3.
Thus, the hydrogen feed rate is 3 kmol/hr.The amount of air fed is determined by the stoichiometric ratio of hydrogen to nitrogen for the feed stream in the production of ammonia. The air fed also contains argon, which builds up in the recycle stream until it has a negative effect on the process.
The argon concentration must be kept below 4 moles/hour per 100 mol/hour hydrogen-nitrogen mixture in the reactor. The single-pass conversion through the reactor is 20%.
Calculation of the amount of ammonia produced and the amount of recycle stream that must be purged to satisfy the concentration condition if the fresh feed has an argon concentration of 0.31 moles/hour per 100 mol/hour hydrogen-nitrogen mixture:
Recycle ratio (R) is the mass flow of the recycle stream divided by the mass flow of the fresh feed entering the system.
Recycle Ratio (R) = 5/3
The extent of reaction for the synthesis of ammonia is x moles.
In the production of ammonia, the nitrogen is supplied at a rate of 1 kmol/hr, and the molar ratio of nitrogen to hydrogen in the feed is 1:3.
As a result, the hydrogen feed rate is 3 kmol/hr.
In the reactor, the moles of argon entering with the fresh feed per hour = 0.31 x (3 + 1)
= 1.24 mol/hr.
The number of moles of argon in the exit stream of the reactor per hour is 5/8 of the number of moles in the entrance stream of the reactor.
If x is the extent of the reaction in the reactor, the moles of ammonia produced per hour = 0.2x(3)
= 0.6x.
Moles of argon in the recycle stream = (1 - 0.2x)(5)
= 5 - x.
The total moles of argon in the reactor is equal to the sum of the argon moles in the entrance stream and the argon moles in the recycle stream.
(1.24) + (5 - x) = 4[(3 + 1) + 5R].1.24 + 5 - x
= 32 + 20R.
Solving these equations gives x = 0.526 mol/hour, and the moles of argon in the exit stream of the reactor is 2.37 moles/hour.
To maintain the argon concentration at or below 4 moles/hour per 100 mol/hour hydrogen-nitrogen mixture in the reactor, the number of moles of argon that must be purged from the recycle stream per hour is
2.37 - 4[(3 + 1)R] = 2.37 - 16R.
Moles of argon that should be purged per hour = (2.37 - 16R) = (0.31/100)(3 + 1)100.(2.37 - 16R)
= 1.24 + 0.12.(2.37 - 16R)
= 1.372.R
= 0.246.
Calculation of the Recycle Ratio
Recycle Ratio (R) = 5/3.
Calculation of the Extent of Reaction and Overall Conversion
The extent of reaction for the synthesis of ammonia is x moles.
The total moles of nitrogen that reacts per hour = x + 1.
The total moles of hydrogen that reacts per hour = 3x + 3.
Therefore, the number of moles of ammonia produced per hour = 0.2(3x)
= 0.6x.
Conversion of single pass = 20%.
Conversion of overall = 1 - (1 - 0.2)(5/3)
= 0.667.
The overall conversion of the reactor is 66.7 percent.
Degree of Freedom Analysis: The reaction system can be divided into three components. Thus, the number of independent variables is 3.The feed stream to the reactor contains five different components (H2, N2, Ar, H2O, and NH3). Since the feed stream flow rate is known, it represents a total of 4 independent variables.
The composition of the feed stream is expressed as the mol fraction of each component, representing four more independent variables. Thus, the feed stream contains eight independent variables.The recycle stream also contains the same five components as the feed stream and is defined by three independent variables:
flow rate, composition, and temperature.
The reactor is defined by the extent of reaction and temperature, which are two independent variables.
Therefore, the overall number of independent variables = 8 + 3 + 2
= 13.
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A waz concert brought in $166,000 on the sale of 8,000 tickets If the tickets soid for $15 and $25 each, how many of each type of ticket were soid? The number of 515 ticketa is
Answers
The number of $15 tickets is 3,400.
Let's suppose that x is the number of $15 tickets that were sold, and y is the number of $25 tickets sold.
The total number of tickets sold is 8,000, so we have:
x + y = 8,000 (Equation 1)
The concert generated $166,000 in revenue, so the amount of money generated by the $15 tickets is 15x and the amount of money generated by the $25 tickets is 25y.
So we can write another equation:
15x + 25y = 166,000 (Equation 2)
We can use Equation 1 to solve for y in terms of x:y = 8,000 - x
Substitute y = 8,000 - x into Equation 2 and solve for x:15x + 25(8,000 - x) = 166,000
Simplify and solve for x:
15x + 200,000 - 25x = 166,000-10x + 200,000 = 166,000-10x = -34,000x = 3,400
We know that the total number of tickets sold is 8,000, so we can use that information to find y:
y = 8,000 - x = 8,000 - 3,400 = 4,600
So there were 3,400 $15 tickets sold and 4,600 $25 tickets sold.
The number of $15 tickets is 3,400.
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Solve the following recurrence relation: remarks: ∑i=1 i = n(n + 1) / 2
∑i=1 i^2 = n(n + 1) (2n +1) / 6
Answers
To solve the given recurrence relation, we use the formulas for the sum of the first n natural numbers and the sum of the squares of the first n natural numbers.
The given recurrence relation consists of two formulas:
∑i=1 i = n(n + 1) / 2 (Sum of the first n natural numbers)
∑i=1 i^2 = n(n + 1)(2n + 1) / 6 (Sum of the squares of the first n natural numbers)
These formulas are well-known and can be derived using various methods, such as mathematical induction or algebraic manipulation.
Using these formulas, we can substitute the given recurrence relation with the corresponding formulas to obtain an explicit solution.
For example, if we have a recurrence relation of the form ∑i=1 i^2 = 2∑i=1 i - 3, we can substitute the formulas to get:
n(n + 1)(2n + 1) / 6 = 2 * n(n + 1) / 2 - 3.
Simplifying the equation, we can solve for n and obtain the explicit solution to the recurrence relation.
In summary, to solve the given recurrence relation, we utilize the formulas for the sum of the first n natural numbers and the sum of the squares of the first n natural numbers. By substituting these formulas into the recurrence relation, we can simplify and solve for the unknown variable to obtain an explicit solution.
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To solve the given recurrence relation, we use the formulas for the sum of the first n natural numbers and the sum of the squares of the first n natural numbers.
The given recurrence relation consists of two formulas:
∑i=1 i = n(n + 1) / 2 (Sum of the first n natural numbers)
∑i=1 i^2 = n(n + 1)(2n + 1) / 6 (Sum of the squares of the first n natural numbers)
These formulas are well-known and can be derived using various methods, such as mathematical induction or algebraic manipulation.
Using these formulas, we can substitute the given recurrence relation with the corresponding formulas to obtain an explicit solution.
For example, if we have a recurrence relation of the form ∑i=1 i^2 = 2∑i=1 i - 3, we can substitute the formulas to get:
n(n + 1)(2n + 1) / 6 = 2 * n(n + 1) / 2 - 3.
Simplifying the equation, we can solve for n and obtain the explicit solution to the recurrence relation.
In summary, to solve the given recurrence relation, we utilize the formulas for the sum of the first n natural numbers and the sum of the squares of the first n natural numbers. By substituting these formulas into the recurrence relation, we can simplify and solve for the unknown variable to obtain an explicit solution.
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When Hien is 25 years old, how old will her turtle be? (Please try to do this quickly)
Answers
Answer:
33 years old
Step-by-step explanation:
We can make the equation [tex]t=h+8[/tex] using the points given to us already, so when Hien is 25 years old, her turtle will be [tex]t=25+8=33[/tex].
Step-by-step explanation:
as we can see when hien was 6 years old turtle was 14 this diffrence in age is 14 - 6 = 8
now when hien is 25 the difference in age will remain same therefore age of turtle = 25+8 = 33
3. Use differentials to estimate the amount of steel on a closed propane tank if the thickness of the steel sheet has 2 cm. The tank has two hemispherical parts of 1.2 meters in diameter,
Answers
Using differentials to estimate the amount of steel on a closed propane tank if the thickness of the steel sheet has 2 cm. The tank has two hemispherical parts of 1.2 meters in diameter, the estimated amount of steel in the closed propane tank is approximately 0.18 cubic meters.
The amount of steel in a closed propane tank can be estimated using differentials. To identify the amount of steel, we need to calculate the surface area of the tank. The tank consists of two hemispherical parts with a diameter of 1.2 meters each.
First, let's calculate the surface area of one hemisphere. The formula for the surface area of a sphere is given by A = 4πr², where r is the radius. Since the diameter is given, we can calculate the radius as half the diameter:
r = 1.2/2 = 0.6 meters.
Now, let's calculate the surface area of one hemisphere: A₁ = 4π(0.6)² = 4π(0.36) ≈ 4.52 square meters. since the tank consists of two hemispheres, we need to multiply the surface area of one hemisphere by 2 to get the total surface area of the tank:
A_total = 2 * A₁ = 2 * 4.52 ≈ 9.04 square meters.
To estimate the amount of steel, we need to consider the thickness of the steel sheet, which is 2 cm. We can convert this to meters by dividing by 100: t = 2/100 = 0.02 meters. Finally, we can calculate the volume of steel by multiplying the surface area by the thickness:
V_steel = A_total * t = 9.04 * 0.02 ≈ 0.18 cubic meters.
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Select the wide flange steel girder for a simple span of 9 {~m} subjected to a concentrated load of 4667 {k N} at the midspan. Use A36 steel and assume that beam is supported
Answers
To select the appropriate wide flange steel girder for a simple span of 9 meters, subjected to a concentrated load of 4667 kN at the midspan, we need to calculate the required section modulus and check if it is available for A36 steel.
Step 1: Calculate the required section modulus:
The section modulus (S) represents the resistance of a beam to bending. It can be calculated using the formula:
S = (P * L^2) / (4 * M)
where:
P is the concentrated load at the midspan (4667 kN),
L is the span length (9 m),
M is the moment at the midspan (P * L / 4).
In this case, the moment at the midspan is (4667 kN * 9 m) / 4
= 10476.75 kNm.
Substituting the values into the formula, we get:
S = (4667 kN * (9 m)^2) / (4 * 10476.75 kNm)
S ≈ 37.9684 * 10^3 mm^3
Step 2: Check the availability of the section modulus for A36 steel:
To select the appropriate steel girder, we need to compare the calculated section modulus (S) with the available section moduli for A36 steel.
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