Answer:
Natural selection is a simple mechanism that causes populations of living things to change over time. Organisms that are more adapted to their environment are more likely to survive and pass on the genes that aided their success.
A boy throws a ball vertically up. It returns the ground after seconds. Find the maximum height reached by the ball.
Answer:
If he throws the ball with speed V then (vertical speed)
V / g is the time to reach maximum height (V2 - V1) / a
The total time to again reach the ground is then
T = 2 V / g
H = 1/2 g t^2 where t = V / g
H = 1/2 g (V / g)^2 = V^2 / (2 g)
This is the familiar formula
V = (2 g H)^1/2 for the initial upwards speed
How many years does it take for pluto to orbit the sun.
Answer:
248 years
Explanation:
The last time this happened was from 1979 to 1999. It won't happen again until 2227.
Write equations for both the electric and magnetic fields for an electromagnetic wave in the red part of the visible spectrum that has a wavelength of 725 nm and a peak electric field magnitude of 2. 9 V/m. (Use the following as necessary: t and x. Assume that E is in volts per meter, B is in teslas, t is in seconds, and x is in meters. Do not include units in your answer. Assume that E
The peak magnetic field of the electromagnetic wave in the red part of the visible spectrum is 9.67 x 10⁻¹⁰ T.
Relationship between electric and magnetic field
The relationship between electric and magnetic field at a given peak electric field is given as;
c = (E₀) / (B₀)
where;
c is speed of lightE₀ is the peak electric fieldB₀ is the peak magnetic fieldB₀ = E₀ / c
B₀ = (2.9) / (3 x 10⁹)
B₀ = 9.67 x 10⁻¹⁰ T
Thus, the peak magnetic field of the electromagnetic wave in the red part of the visible spectrum is 9.67 x 10⁻¹⁰ T.
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true or false. Revolution is the movement of Earth around the sun.
This is science
Answer:
True
Explanation:
REVOLUTION is the time it takes to REVOLVE around the sun
ROTATION is the arth spinning on its axis every 24 hrs to make a day
Current 1 of 8.4 A runs for 240 seconds and then stops. Current 2 is 10.5 A. How long does current 2 have to run to deliver the same amount of charge as current 1? 88.2 s 192 s 2016 s 21,000 s
Answer:
The charge of a current in a given period of time is calculated by multiplying the current and the duration of that current. Since in the problem charge would be constant, we can relate the first conditions to the second conditions.
q = IT
q1 = q2
I1T1 = I2T2
8.4(240)=(10.5)(T2)
T2 = 192 seconds
if a plane is flying in the air and it crashes on the border of america and canada where do u bury the survivors
Answer:
Why would you bury the survivors? LOL
Answer:
you dont bury the surviors because they are alive.
Explanation:
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Explanations based on supernatural forces, values or ethics can never be disproved and thus do not fall under the realm of science.
options:
True
False
Answer:
true, since science does not believe and agree to the supernatural.
A collision is elastic only when kinetic energy and momentum are conserved through the collision. Group of answer choices True False
Answer:
Both momentum and kinetic energy are conserved quantities in elastic collisions.
Explanation:
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision.
Lesson 18, Physical Science
Please help!! I'll mark you as Brainlest
Q1. Describe how the skater's kinetic and potential energy change as the skater descends. Explain what happens to the total energy (potential energy + kinetic energy) in terms of the Law of Conservation of Energy.
Change the skater with the "Choose Skater" button.
Q2. Describe any changes to the bar graphs you see when you change skaters. Is the Law of Conservation of Energy still obeyed?
Reset the half-pipe and click on the "Show Grid" check box. Grab the track (drag the track with a right-click) and set the bottom of the track at "zero" height.
Select the default, 75 kg, PhET skater and set him at 5.0 meters above the zero and allow him to skate.
Q3. How much potential energy does the skater have at 5.0 meters? How much kinetic energy does the skater have at 0.0 meters?
Q4. If a 20.0 kg skater started his skate at 10 meters height (on Earth):
How much potential energy would the skater have at the start of skating?
How much kinetic energy would the skater have at the start of skating?
How much potential energy would the skater have at zero height?
How much kinetic energy would the skater have at zero height?
Create this skate path:
Start the skater on the left side and observe. Then answer the following question:
Q5. Does the skater have enough energy to make it all the way to the right side? Explain why or why not.
If the skater starts on the left on the following path:
Q6. Answer the parts of this question based upon the above skater path. If the skater starts at point "A":
Where does the skater have the maximum potential energy?
Where does the skater have the minimum potential energy?
Where does the skater have the minimum kinetic energy?
Where does the skater have the maximum kinetic energy?
At which two points would the skater have about the same kinetic energy?
Q7. Based upon the equation for potential energy, how do you expect the potential energy to change when the gravity is lower than it is on Earth (for example, gravity on the moon is 1.6 m/s2 )?
Use the option boxes to move the skater to Jupiter, where acceleration due to gravity is 26 m/s2.
Q8. Describe any differences you see in potential and kinetic energy between the Earth and Jupiter.
Use the option boxes to move the skater to the moon where the acceleration from gravity is 1.6 m/s2.
Q9. Describe any differences you see in potential and kinetic energy between the Earth and the moon.
Q10. Does this agree with the prediction you made in Q7?
Q11. How high must a 20 kg skater start at to have a kinetic energy of 360 joules at a height of 0 meters?
Q12. What is the total energy of the 60.0 kg skater before she starts her ride, 12 meters above the ground?
Q13. If you throw a 2.0 kg basketball straight up in the air, at what height will the basketball have 160 J of potential energy?
Q14. Describe what happens to the bar graphs when you change the amount of friction. Is the Law of Conservation of Energy still obeyed?
The kinetic energy of the skater would increase while his potential energy would decrease as he descends from top to bottom.
What is the law of conservation of energy?The law of conservation of energy states that the energy possessed by a physical body can neither be created nor destroyed, but it can only be converted (transformed) from one form of energy to another.
Based on the law of conservation of energy, the total energy (potential energy + kinetic energy) would always remain constant because it is conserved.
The potential energy of this skater at a height of 5.0 meters is given by:
PE = mgh
PE = 75 × 9.8 × 5.0
PE = 3,675 Joules.
Also, the kinetic energy of this skater at a height of 0.0 meters would be equal to zero assuming it is at rest.
In conclusion, the potential energy possessed by a physical body is highly dependent on its height while kinetic energy depends only on motion, regardless of height.
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A wave along a guitar string has a frequency of 440 hz and the wavelength of 1. 25m. What is the speed of the wave?
Answer:
550 m/s
Explanation:
Speed of wave = wl * f wl = 1,25 m f = 440 Hz (given)
1.25 m * 440 = 550 m/s
What direction would the north pole of a bar magnet point if you were to hang the bar magnet from a thin string?.
Answer:
TOWARD the North pole.
Explanation:
PHYSICS GIVING LOTS OF POINTS!!! 100
The number of protons in the nucleus of an atom determines the species of the atom, i.e., the element to which the atom belongs. An atom has the same number of protons and neutrons. But the electron number cannot be used instead because
electrons are not within the nucleus
electrons are negatively charged
electrons can be removed from or added to an atom
electrons are lighter than protons
Answer:
electrons can be removed or added creating ions of the element
Explanation:
A boy holds a toy soldier in from of a concave mirror. The focal length of the mirror is 0.45 m and the boy holds the toy soldier at a distance of 0.25m from the mirror. Find the image distance.
Because sound waves vibrate longitudinally, what can result?
A Disruptions of fixed waves
B. Changes in the density of air
С. Pressure differences where compressions are rarefied
D Regions of high pressure and low pressure
I NEED HELP ASAPPP!!!!!!!! someone help me!!! :(
What do Jupiter, Neptune, and Saturn have in common?
Answer:
There are not close to the sun, outer planets, and have rings
Explanation:
A student uses the right-hand rule as shown. an illustration with a right hand with fingers curled and thumb pointed up. what is the direction of the magnetic field in front of the wire closest to the student? up right down left
The direction of the magnetic field in front of the wire closest to the student is on the left. The direction is found by the right-hand rule.
What is the right-hand rule?The right-hand rule is a popular mnemonic for remembering how axes in three-dimensional space are oriented.
The fact that the three axes of three-dimensional space have two different orientations gives birth to the majority of the many left-hand and right-hand rules.
Using the right-hand rule, we can recall this diagram. Your thumb points in the direction of the magnetic force pushing on the moving charge
If you point your pointer finger in the direction of the positive charge and then your middle finger in the direction of the magnetic field.
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Answer:
left
Explanation:
edge 2022
The strength of the electric field 0.5 m from a 6 µc charge is n/c. (use k = 8.99 × 109 n•meters squared per coulomb squared and round answer to the nearest whole number.)
53....................................
Explanation:
If an asteroid with a diameter of 1 km strikes the earth, how big of a crater will it make?.
An asteroid with diameter of 1 km will have a crater of 5.236 x 10⁸ m³ volume when it strikes the earth.
Volume of crater made by the asteroidThe impact created by an asteroid when it strikes the earth depends on several factors such as the size of the asteroid.
The bigger the diameter of the asteroid the bigger the crater volume it will make when it strikes the earth.
Assuming the asteroid to be spherical, volume of the crater is calculated as follows;
V = 4/3πr³
Where;
r is radius of the sphere = 500 mV = 4/3π(500)³
V = 5.236 x 10⁸ m³
Thus, an asteroid with diameter of 1 km will have a crater of 5.236 x 10⁸ m³ volume when it strikes the earth.
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The shared attitudes, values, goals, and practices that characterize groups is defined as
A. family
B. parenting
C. genetics
D. culture
Please select the best answer from the choices provided
Ο Α.
OB
Ос
OD
Glass does not transmit ultraviolet radiation. Suggest what happens to ultraviolet radiation when it is incident on glass. (1 mark)
Answer:
Most of UV radiation is stopped by glass & this is why you will not get sunburns behind a glass. The glass simply filters out the UV radiation that is responsible for the sunburns & protect your skins from these energetic & somewhat harmful radiation
Explanation:
UV radiation with a 200 nm wavelength shines on a gold electrode in a photoelectric cell. What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
For a UV radiation with a 200 nm wavelength is mathematically given as the maximum kinetic energy, in eV, of photoelectrons ejected from the gold
K.E=1.779*10^{19}J
K.E=1.112ev
What is the maximum kinetic energy, in eV, of photoelectrons ejected from the gold?
Generally, the equation for the photo electric equation is mathematically given as
[tex]hc/\lambda=K.E+\phi[/tex]
Therefore
K.E=(6.626*10^{-34}*3*10^8/2*10^{-7})-5.1*1.6*10^{-19}
K.E=1.779*10^{19}J
In conclusion, in eV, of photoelectrons ejected from the gold
K.E=1.112ev
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True or False
1. Conduction occurs only when molecules are in contact with each other.
2. Fast moving particles will take heat from slow moving particles.
3. Energy is carried in waves during conduction.
4. Conduction can transfer heat through space.
5. Warmer particles will give heat to cool particles.
6. During conduction, the movement of the molecules is important.
7. Light is a form of conduction heat transfer.
8. A carrier is needed for conduction to occur - something must carry the heat.
9. Fast moving particles will speed up slow moving particles.
#1
True#2
No it happens opposite as heat transfers from high to low
False#3
True#4
No it can't be happened in vaccum
False#5
True(Stated in no 2)#6
TrueFaster the movement faster the heat transfer
#7
Light particles get transferred from low to high (sun light)
True#8
True#9
FalseWhen looking at a velocity vs. time graph, the ___ is equal to the displacement .
Answer:
area bound by the line and the axes???
Explanation:
What type of corrective lenses would an eye doctor most likely prescribe for a patient with astigmatism?.
Evelynn is measuring the pitch of a piano note. What unit of measurement is she most likely recording her value
in?
O hertz
decibels
Ofrequency
amplitude
Answer:
hertz
Explanation: play piano
This property of matter describes
a substance's ability to be
stretched thin?
Answer:
Ductility
Explanation:
is the physical property of a material associated with the ability to be hammered thin or stretched into wire without breaking. A ductile substance can be drawn into a wire.
The signs of cognitive (mental) stress include all of the following except: a. loss of memory b. loss of concentration c. poor judgment d. isolation please select the best answer from the choices provided. a b c d
All of the above-mentioned symptoms of cognitive stress except for isolation. Option d is correct.
What is cognitive mental stress?Mental (cognitive) stress is an emotional/physical strain that causes a person to feel irritated, depressed, angry, anxious, and so on.
Cognitive stress is marked by a variety of moods and/or emotions linked to excessive anxiety about money, overall health, job loss, and so on.
All of the above-mentioned symptoms are markers of cognitive stress. In some circumstances, this condition may exacerbate stress.
Loss of memory, loss of concentration, and poor judgment are symptoms that are markers of cognitive stress.
Social isolation has been linked to a variety of mental illnesses, including increased stress, despair, and anxiety.
Hence all of the above-mentioned symptoms of cognitive stress except isolation. Option d is correct.
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Answer:
D
Explanation:
Question :- If a spring of spring constant ‘m’ is divided into 5:3 ratio, then what will be the spring constant of the larger piece of spring?
Answer :- 8m/5
I need explanation!
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Here we go ~
As we have been given, The spring of spring constant " m " was cut to form 2 new springs in ratio of 5 : 3.
we have to find out the spring constant of the longer spring which was formed, and it's given that spring constant of the main spring was " m "
Now, let the length of main spring be " l "
So, lengths of the resultant springs will be :
[tex]\qquad \cal \dashrightarrow \: \dfrac{5l}{8} \: \: and \: \: \dfrac{3l}{8} \: \: \: \: respectively[/tex]
And we know that spring constant is inversely proportional to length of spring so, we infer that :
[tex]\qquad \cal \dashrightarrow \: m\propto \dfrac{1}{l} m \: \: \: \: \: - (1)[/tex]
where, m is spring constant of main spring and l is its length.
[tex]\qquad \cal\dashrightarrow \: m_1 \propto \dfrac{8}{5l} \: \: \: \: \: \: \: - (2)[/tex]
where, m1 is spring constant of longer spring, and 5l/8 is its length.
let's divide (2) by (1), we will get ~
[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5l} \div \dfrac{1}{l} [/tex]
[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5l} \times \dfrac{l}{1} [/tex]
[tex]\qquad \cal \dashrightarrow \: \dfrac{m_1}{m} = \dfrac{8}{5} [/tex]
[tex]\qquad \cal \dashrightarrow \: {m_1}{} = \dfrac{8}{5} m [/tex]
So, the spring constant of equivalent longer strong formed will be 8/5 m
prove:
[tex]m_2 = \frac{8m}{5} [/tex]
Explanation:
Given:
Spring constant of spring= m
The ratio of spring = 5:3
To find:
spring constant of the larger piece of spring?
Solution:
Let the length of larger piece L2 be 5x and smaller piece L1 be 3x with spring constant m2 and m1 respectively.
now,
spring constant (m) inversely proportional to the length of spring i.e.
[tex]m \propto \: \frac{1}{l} {,}\: m_1 \propto \: \frac{1}{l_1} {,}\: m_2 \propto \: \frac{1}{l_2}[/tex]
Also,
The spring is connected in series hence,
[tex] \frac{1}{m} = \frac{1}{m_1} + \frac{1}{m_2} [/tex]
and
[tex] \frac{m_1}{m_2} = \frac{l_2}{l_1} \\ {m_1} = {m_2} \cdot \frac{l_2}{l_1} \\ {m_1} = {m_2} \cdot \frac{5}{3} \\ [/tex]
Substituting above value in,
[tex] \frac{1}{m} = \frac{1}{m_1} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{1}{{m_2} \cdot \frac{5}{3}} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{3}{5m_2} + \frac{1}{m_2} \\ \frac{1}{m} = \frac{3m_2 + 5m_2}{5 {m_2}^{2} } \\ \frac{1}{m} = \frac{8m_2}{5 {m_2}^{2} } \\ \frac{1}{m} = \frac{8 \cancel {m_2}}{5 \cancel{m_2}^{2} } \\ \frac{1}{m} = \frac{8}{5m_2} \\ m_2 = \frac{8m}{5} [/tex]
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What is a mutation? *
A) a type of molecule that genes and chromosomes are made of
B) a random change to a gene that sometimes results in a new trait
C)the process in which two parents pass on their genes to create offspring
D)a characteristic that all members of a species have
Three liquids are at temperatures of 13 ◦C, 19◦C, and 40◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 15◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 36.9 ◦C. Find the equilibrium temperature when equal masses of the first and third are mixed. Answer in units of ◦C.
Answer:
2 C1 = 4 C2 heat loss = heat gain
C1 = 2 C2
17.9 C2 = 3.1 C3 mixing second and third
17.9 / 2 C1 = 3.1 C3 C1 for C2
17.9 C1 = 6.2 C3
C3 = 2.89 C1
C1 (T - 13) = C3 (40 - T) heat loss = heat gain
T - 13 = 2.89 (40 - T) = 115.5 - 2.89 T
3.89 T = 128.5
T = 33 deg C
When liquids A and D is added the temperature of the mixture will be θ= 36.71°C.
What is Temperature ?
Temperature is a physical quantity which measures hotness and coldness of a body. Temperature measures the degree of vibration of molecule in a body. Temperature is measured in centigrade (°C), Fahrenheit (°F) and Kelvin (K) in which Kelvin (K) is a SI unit of temperature. Absolute scale of temperature means Kelvin scale of temperature. relation between Kelvin(K) and centigrade (°C), °C= K - 273.15 from equation, 273.15 K means 0 °C, which is freezing point of water (ice).
Let m be the mass of each liquid and C₁,C₂,C₃ Be specific heat of liquid A,B,C Respective. When A and B are mixed. The final temperature is 15°C
∴ Heat gained by A= heat lost by B
i.e. mC₁(15−13)=mC₂(19-15)
5C₁ = 4C₂
C₂ = 5/4 C₁ ________1)
When B and C are mixed. The final temperature is 36.9°C
∴ Heat gained by B= heat lost by C
i.e. mC₂(36.9−19)=mC₃(40-36.9)
C₂17.9 = C₃3.1
C₃=5.77C₂_____2)
from equa. 1) and 2)
We get,
C₃=5.77(5/4 C₁)
C₃ = 7.21 C₁
When A and C is mixed let the final temperature be θ.
C₁(θ-13) = C₃(40-θ)
C₁(θ-13)=7.21 C₁(40-θ)
(θ-13)=7.21 (40-θ)
θ-13= 288.4-7.21θ
8.21 θ=288.4+13
8.21 θ= 301.4
θ= 36.71°CTo know more about temperature :
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