Yes, the flow near a cylindrical rod of infinite length can be described by the method in example 4.1-l. This example uses the method of images to calculate the velocity field of the axial flow around a cylindrical rod of infinite length.
To calculate the velocity field, we need to take the velocity potential of the image sources and double integrate it with respect to the cylindrical coordinates. This will yield the axial velocity.
The image sources are chosen such that the fluid flow is symmetric about the centerline of the rod. Therefore, when the axial flow is suddenly set in motion, the image sources also have a velocity in the axial direction. This velocity will be equal to the velocity of the original flow at the same position.
Once the velocity of the image sources is known, the velocity potential of the entire flow can be calculated. This velocity potential is then used to calculate the velocity field in the axial direction around the rod.
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a track star runs a 400-m race on a 400-m circular track in 45 s. what is his angular velocity assuming a constant speed?
The angular velocity assuming a constant speed for a track-star who runs 400 m circular track in 45 s is 0.139 radians/s.
To calculate the angular velocity first the circumference of the track is 400 meters.
This means that the angular displacement of the track star during the race is:
θ = s / r
where θ is the angular displacement,
s is the distance traveled by the track star (which is equal to the circumference of the track), and
r is the radius of the circular track.
2.) Since the radius of the circular track is half of its diameter, we have:
r = 400 m / 2 = 200 m
Plugging this into the equation for angular displacement, we get:
θ = 400 m / 200 m = 2π radians
3.) Next, we can use the formula for angular velocity:
ω = θ / t
where ω is the angular velocity and
t is the time it takes for the track star to complete the race.
4.)Plugging in the values we have:
ω = θ / t
ω = 2π radians / 45 s
Therefore, the angular velocity of the track star is:
ω = 0.139 radians/s (rounded to three significant figures)
Therefore, the track star's angular velocity assuming a constant speed is approximately 0.139 radians/s
The angular displacement of the track star is equal to one complete revolution around the circular track, which is equal to 2π radians.
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a person whose weight is 509n is being pulled up vertically by a rope from the bottom of a cave that is 33.1m deep. the maximum tension that a rope can withstand without breaking is 571n. what is the shortest time, starting from rest, in which the person can be brought out of the cave?
A person whose weight is 509n is being pulled up vertically by a rope from the bottom of a cave that is 33.1m deep. the maximum tension that a rope can withstand without breaking is 571n. The shortest time to bring the person out of the cave, starting from rest is: 3.74 seconds, this time is determined by the tension of the rope and the acceleration due to gravity.
The shortest time to bring a person whose weight is 509n out of a 33.1m deep cave is determined by the maximum tension that the rope can withstand without breaking.
First, calculate the total weight of the person plus the rope tension: 509n + 571n = 1080n.
Second, calculate the acceleration due to gravity (g): g = 1080n / 33.1m = 32.6 m/s^2.
Third, calculate the acceleration time: t = √ (2 * 33.1m) / 32.6 m/s^2 = 3.74 seconds.
Therefore, the shortest time to bring the person out of the cave is 3.74 seconds, starting from rest. This time is determined by the tension of the rope and the acceleration due to gravity.
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a driver, traveling at 22 m/s, slows down her 2000 kg truck to stop for a red light. what work is done on the truck by the friction force of the road?
The work done on the truck by the friction force of the road is -484,000 J. This work is done by the friction force of the road. Therefore, the work done by the friction force of the road is also negative.
To determine the work done by the friction force of the road on the truck, we can use the work-energy principle, which states that the net work done on an object is equal to its change in kinetic energy.
The initial kinetic energy of the truck is:
[tex]K_1 = \frac{1}{2} . m . v_1^2\\K_1= \frac{1}{2} .(2.000 kg). (22 m/s)^2\\K_1 = 484,000 J[/tex]
Since the truck comes to a stop, its final kinetic energy is zero. Therefore, the net work done on the truck is equal to its initial kinetic energy:
[tex]Net work = K_ - K_2\\Net work = 484,000 J - 0\\Net work = 484,000 J[/tex]
The friction force of the road acts opposite to the direction of motion of the truck and causes it to slow down. Therefore, the work done by the friction force is negative:
Work by friction force = -484,000 J
Therefore, the work done on the truck by the friction force of the road is -484,000 J.
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an elevator suspended by a cable is descending at constant ve-locity. how many force vectors would be shown on a free-body diagram? name them
When an elevator is descending at a constant velocity, the forces acting on it can be represented by two force vectors on a free-body diagram.
What is a free-body diagram (FBD)?A free-body diagram (FBD) is a graphical representation of the forces acting on a system. They are:
Gravity force or weight force: This force vector acts downward and is equal to the weight of the elevator. This force is determined by the mass of the elevator and the acceleration due to gravity.
Tension force: This force vector acts upward and is equal to the force exerted by the cable that suspends the elevator. This force is equal in magnitude to the weight force but in the opposite direction.
The system’s internal and external forces, as well as its forces of interaction with other systems, are all included in the FBD. It is essential to understand these forces before solving a physics problem.
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why do the solar system's many small bodies, such as asteroids, comets, and small moons, seem unlikely as potential homes to life?
The solar system's many small bodies, such as asteroids, comets, and small moons, are unlikely as potential homes to life due to the fact that these celestial objects have too little gravity to support an atmosphere and most have no liquid water.
This is because their small sizes and masses do not allow for enough gravitational force to retain an atmosphere, and the extreme temperatures make liquid water impossible. Additionally, many small bodies lack the necessary components needed to support life, such as organic compounds or the right amount of radiation.
Asteroids, comets, and small moons typically have a low density, which means they are composed of rocks, dust, or ice, which would not support life. Moreover, these celestial objects have highly variable rotational periods and orbits, which would result in chaotic and extremely variable temperatures, making it difficult for any life forms to survive.
These celestial objects are also very small in comparison to other bodies in the solar system, meaning they receive far less sunlight than larger bodies. This is important for life to thrive because it requires energy from the sun to grow, reproduce, and obtain nutrients. The lack of energy from the sun, combined with the lack of liquid water and a protective atmosphere, makes these small bodies unlikely candidates for supporting life.
Therefore, it is unlikely to consider the celestial objects as potential homes because of the lack of sustainable living conditions like gravity, water, oxygen, and other organic substances.
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in which disorder of the eye does the optic axis become too long, resulting in the light coming to a focus in front of the retina?
The disorder of the eye is known as Myopia.
The medical term for this disorder is called “near-sightedness”. Myopia is a type of refractive error of the eye that causes distant objects to appear blurred while nearby objects remain in focus.
The eye’s ability to focus on objects at different distances is due to the refraction or bending of light as it passes through the eye’s cornea and lens. The light is then focused onto the retina, a layer of light-sensitive cells located at the back of the eye.
In the case of myopia, the eyeball is too long, and the lens or cornea is too curved, causing the light to come to a focus in front of the retina instead of directly on it. This leads to blurred vision when viewing distant objects.
There are many causes of myopia, including genetic factors, environmental factors, and lifestyle factors such as reading or working on a computer for prolonged periods. Myopia can also worsen over time if left untreated, which can lead to a higher risk of eye conditions such as cataracts, glaucoma, and retinal detachment.
Treatment for myopia includes corrective lenses such as glasses or contact lenses, refractive surgery, or orthokeratology, which involves using specially designed contact lenses to reshape the cornea overnight. Regular eye exams are important to diagnose and manage myopia to prevent complications and maintain healthy vision.
Therefore, the disorder of the eye in which the optic axis becomes too long, resulting in the light coming to a focus in front of the retina is Myopia or Near-sightedness.
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a square in plastic with 10 cm length is charged uniformly with an extra 1011 electrons. what is the electric field 1.0 mm above the surface at a point near the center?
The electric field 1.0 mm above the surface at a point near the center is 1.13 × 10⁵ [tex]\frac{N}{C}[/tex] . This is taken out by coulomb ' s law .
What is electric field ?An electric field (also known as an E-field is a physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, attracting or repelling them. It also refers to the physical field of a charged particle system.
Electric fields play an important role in many fields of physics and are used in electrical technology. For example, in atomic physics and chemistry, the electric field is the attractive force that holds the atomic nucleus and electrons together in atoms. It is also the driving force behind chemical bonding between atoms, which results in molecules.
use formula E = σ /ε
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suppose a 20.0-kg monkey climbs a vine. what is the tension in the vine if they climbs at a constant speed?
The tension in the vine if a monkey climbs a vine at a constant speed is 0 Newton.
The magnitude of tension force depends on the amount of force applied to the ends of the string or rope, as well as the properties of the string or rope itself, such as its length, thickness, and elasticity.
Tension force is often used in mechanical systems to transfer forces or transmit power. For example, a cable used to lift a heavy object will experience tension forces as it resists the weight of the object. Similarly, a belt in a car engine experiences tension forces as it transfers power from the engine to the wheels.
Mass of the monkey, m = 20 kg.
Let the tension in the vine be T.
The acceleration of the monkey is zero since the speed is constant.
Using the second law of motion,F = ma
Here, acceleration, a = 0F = 0N = ma= 20 x 0= 0 N
Tension in the vine is zero.
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what is the value of the acting force between the coils if current is 30 a, separation between the coils is 5 cm, and the radius is 50 cm
The value of the acting force between the two coils is approximately 5.65 N.
F = (μ₀/4π) * (2I₁I₂*l)/d
Substituting these values into the method, we get:
F = (4π × [tex]10^{-7}[/tex] T·m/A) * (230 A30 A*π m)/(0.05 m)
Simplifying the expression, we get:
F ≈ 5.65 N
Force is an agent that can change the state of motion or shape of an object. it is a vector amount that has both value and path. Force can be applied through direct contact or from a distance, such as through gravitational or electromagnetic fields. Pressure is measured in gadgets of newtons (N) inside the international gadget of units (SI). Some common examples of forces include friction, tension, gravity, and electromagnetic forces.
According to Newton's laws of motion, force is directly proportional to the rate of change of momentum of an object. This means that a larger force will cause a greater acceleration of an object, and a smaller force will cause a smaller acceleration. Understanding the concept of force is essential to many areas of physics, including mechanics, thermodynamics, and electromagnetism.
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Some students want to demonstrate thermal expansion. They divide the following method: A large black balloon is taken to a shady area and filled with cool air. The balloon is then taken to a bright, sunny location. After a short time, the balloon begins to expand.
What explanation does this investigation verify?
A. A balloon filled with cool air will rise into the atmosphere
B. As particles gain energy the material takes up more space.
C. The air inside the balloon lost energy.
D. The sunlight caused the air in the balloon to contract.
Answer:
you are welcome!
The investigation described verifies option B: "As particles gain energy, the material takes up more space."
When the cool air is pumped into the balloon in a shady area, the particles in the air have less energy and are closer together. When the balloon is moved to a bright, sunny location, the air inside the balloon absorbs the energy from the sunlight and the particles gain energy, which makes them move faster and farther apart. As a result, the air inside the balloon takes up more space and the balloon expands.
This phenomenon is an example of thermal expansion, which is the tendency of matter to change its shape, volume, and area in response to a change in temperature.
how large must the coefficient of static friction be between the tires and the road if a car is to round a level curve of radius 150 m m at a speed of 121 km/h k m / h ?
The coefficient of static friction, μs, between the tires and the road needs to be greater than the centripetal acceleration divided by the gravitational acceleration.
In this case, the centripetal acceleration can be calculated as ac = [tex](v^2)/r[/tex], where v is the speed and r is the radius of the curve. Therefore, the required coefficient of static friction μs = ac/g, where g is the gravitational acceleration, should be greater than μs = [tex](121 km/h)^2[/tex] / (150m) / [tex]9.81m/s^2[/tex] ≈ 0.93.
This means that the coefficient of static friction should be greater than 0.93 in order for the car to be able to round a level curve of radius 150 m at a speed of 121 km/h. This coefficient of static friction is necessary to counteract the centripetal force, allowing the car to round the curve without slipping.
If the coefficient of static friction is not large enough, the car will not be able to round the curve at the speed specified.
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which of the following is true about a comet that is on an elliptical orbit around the sun? question 24 options: the comet's speed is greatest when it is farthest from the sun. the comet's speed is greatest when it is nearest the sun this comet's speed is zero. the comet's speed is constant because its mass and the sun's mass stay approximately the same
The following is true about a comet that is on an elliptical orbit around the sun is b. The comet's speed is greatest when it is nearest the sun.
A comet is an object in space with a visible coma or atmosphere, along with a "tail" that can extend for millions of miles through space. A comet's orbit is elliptical or oval-shaped; that is, it is more elliptical or oval-shaped than a planet's or moon's orbit.
As a result, when it approaches the sun, its velocity increases.When the comet is closest to the sun, its speed is greatest. This is due to the fact that as a comet travels closer to the sun, it falls under the sun's gravitational pull, causing its speed to increase. As a result, the comet's velocity at its closest approach to the sun is the highest.
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) now you will start taking data with the magnetometer. select the magnetometer sensor and start recording data. un-check the bx and bz boxes so that only the by trace is being displayed on the chart. stand several feet away from anything metallic or magnetic and point the y-axis of the iolab in different directions (forward, backward, up, down, left, right, etc) and find the orientation of your iolab for which its measurement of by has the biggest value. what does this tell you about the direction of the earths magnetic field in your location?
It shows that the orientation of the iolab that gives the largest "by" reading corresponds to the direction of the Earth's magnetic field in your location.
How to explain the informationA magnetometer is a device that measures magnetic fields. It can be used to detect the Earth's magnetic field, which is generated by the motion of molten iron in the Earth's core. The Earth's magnetic field is a vector field, which means that it has both magnitude and direction.
When you stand several feet away from anything metallic or magnetic and point the y-axis of the iolab in different directions, you are essentially changing the orientation of the magnetometer sensor relative to the Earth's magnetic field. The sensor measures the strength of the magnetic field component in the direction of the sensor. In this case, you are only measuring the "by" component of the magnetic field, which is the component of the field that is perpendicular to the surface of the Earth.
By finding the orientation of the iolab for which its measurement of "by" has the biggest value, you are essentially finding the direction of the Earth's magnetic field in your location. The direction of the Earth's magnetic field at any point on the Earth's surface is not constant, and it varies with location. However, in general, the direction of the Earth's magnetic field at any point on the Earth's surface is roughly parallel to the surface of the Earth and points towards the geographic North Pole.
Therefore, the orientation of the iolab that gives the largest "by" reading corresponds to the direction of the Earth's magnetic field in your location.
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a 7.6 nc point charge and a - 2.6 nc point charge are 3.1 cm apart. what is the electric field strength at the midpoint between the two charges?
The electric field strength at the midpoint between a 7.6 nc point charge and a -2.6 nc point charge which are 3.1 cm apart is 279.8 N/C.
What is an electric field?An electric field refers to a field surrounding a charged object, through which another charged object would feel a force. A charge placed in an electric field is subjected to a force depending on the charge and distance from the source of the field.
The electric field intensity or strength may be calculated using Coulomb's law by taking the charge 'Q' as a point charge and then determining the value of the electric field at a distance 'r' from the charge.
The magnitude of the electric field due to a point charge Q at a distance r is
E=kQ/r²,
where k is Coulomb's constant,
k=9×10⁹ Nm²/C².
So, the electric field at the midpoint is due to the combined effect of both charges. The charges are located 3.1 cm apart, so the midpoint is 1.55 cm from each of the charges. Therefore, we need to calculate the electric field due to each of the charges separately and add them up. The electric field at the midpoint due to a 7.6 nc point charge E₁=kQ₁/r₁²
=(9×10⁹ Nm²/C²)(7.6×10⁻⁹ C)/(0.0155 m)²
=294.47 N/C.
The electric field at the midpoint due to a -2.6 nc point charge
E₂=kQ₂/r₂²
=(9×10⁹ Nm²/C²)(-2.6×10⁻⁹ C)/(0.0155 m)²
=-14.67 N/C.
The net electric field at the midpoint is given by
E=E₁+E₂=294.47 N/C-14.67 N/C
=279.8 N/C.
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the two regions of the electromagnetic spectrum where the earth's atmosphere is transparent (radiation can get in) are visible light and:
The two regions of the electromagnetic spectrum where the earth's atmosphere is transparent (radiation can get in) are visible light and ultraviolet radiation.
What is the electromagnetic spectrum?The electromagnetic spectrum is a range of electromagnetic waves, which includes visible light, gamma rays, X-rays, ultraviolet light, microwaves, radio waves, and infrared radiation. The range of frequencies that electromagnetic radiation encompasses is referred to as the electromagnetic spectrum.
The earth's atmosphere is transparent to radiation in two regions of the electromagnetic spectrum: visible light and ultraviolet radiation. The following are some of the features of visible light: It is a region of the electromagnetic spectrum that is visible to the human eye. Because of its wavelength, visible light is seen as a color. It has a wavelength of 400-700 nm, and it is approximately 10-7 meters long.
The following are some of the characteristics of ultraviolet radiation: The electromagnetic radiation's frequency is higher than that of visible light. Ultraviolet radiation has a wavelength of 10-8-10-7 meters.
If light can travel through something and everything behind it is clearly visible, it is said to be transparent. A transparent object enables light to pass through it without being diffused.
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Find the work done in moving a particle from P to Q if the magnitude and direction of the force are given by v.
P(−2,9), Q(−12,8), v=3i-6j
The work done in moving a particle from P to Q if the magnitude and direction of the force are given by v = 3i - 6j is 24 Joules.
The work done in moving a particle from P to Q if the magnitude and direction of the force are given by v = 3i - 6j can be found using the dot product formula:
[tex]W = \vec F \cdot \vec d[/tex]
where, [tex]\vec F[/tex] is the force, and d is the displacement vector from P to Q.
The coordinates of point P and Q is (-2, 9) and (-12, 8).
So, we need to find the displacement vector from P to Q.
[tex]d = (-12-(-2))\hat i, (8 - 9)\hat j[/tex]
[tex]d = (-10\hat i - 1\hat j)[/tex]
Work done in moving a particle from P to Q is:
[tex]W = \vec F \cdot \vec d[/tex]
Where [tex]F = 3\hat i - 6\hat j[/tex] and [tex]d = (-10\hat i - 1\hat j)[/tex].
[tex]W = (3\hat i - 6\hat j) . (-10\hat i - \hat j)W = -30 + 6[/tex]
W = - 24 Joules
the negative sign indicates work done is in the opposite direction of motion.
Therefore, the work done in moving a particle from P to Q if the magnitude and direction of the force are given by v = 3i - 6j is 24 Joules.
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what is the equation to find the equivalent resistance, req, of two resistors in series, r1 and r2? group of answer choices
The equivalent resistance of resistors in series is always greater than the individual resistances. This is because the total resistance of the circuit is the sum of the resistances, and therefore the electric current has to overcome more resistance to flow through the circuit as compared to when a single resistor is used.
To find the equivalent resistance, req, of two resistors in series, r1 and r2, the following equation is used:
Req = R1 + R2
Where Req is the equivalent resistance of the series circuit,
R1 is the resistance of the first resistor,
R2 is the resistance of the second resistor.
Resistors in a circuit are the components that oppose the flow of electric current. When two resistors are connected in series, they are connected end to end so that the electric current flows through one resistor before flowing through the second one.In a series circuit, the equivalent resistance, req, is calculated as the sum of the individual resistances of the resistors connected in series.
Therefore, to find the equivalent resistance of two resistors in series, R1 and R2, we add the resistance values of the two resistors, as shown in the formula above.
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An 82.0-kg person rides on a carnival ride in a 45.0-kg basket supported by a single chain. When the ride reaches its top speed, the basket moves at a constant speed in a horizontal circle with a radius of 7.10 m. At this point, the chain supporting the basket is at a 45.0 angle to the vertical. A)At top speed, how large are the vertical and horizontal components of the tension in the chain? (Hint: The vertical component of the tension equals the weight it supports.) B) What is the magnitude of the centripetal acceleration of the basket and its passenger? C) What is the speed of the basket and its passenger? D) How long does it take the basket to make one complete circle?
The vertical component of the tension is 1,177.05 N while the horizontal component of the tension is 127.47 × 3.90² = 1,949.04 N.
The magnitude of the centripetal acceleration is 2.14 m/s².
What is the value of the vertical and horizontal components of the tension in the chain?A) The vertical component of the tension equals the weight it supports, which is the weight of the person plus the weight of the basket:
Weight = (82.0 kg + 45.0 kg) × 9.81 m/s²
Weight = 1,177.05 N
Therefore, the vertical component of the tension is 1,177.05 N.
To find the horizontal component of the tension, we can use the fact that the net force in the horizontal direction is zero when the basket is moving at a constant speed.
The only horizontal force is the component of the tension perpendicular to the radius, so:
The horizontal component of tension = centripetal force
Horizontal component of tension = (mass × centripetal acceleration)
Horizontal component of tension = (82.0 kg + 45.0 kg) × (v²/7.10 m)
Horizontal component of tension = 127.47 v² N
Setting these two components equal to each other gives:
1,177.05 N = 127.47 v² N
Solving for v gives:
v = 3.90 m/s
Therefore, the horizontal component of the tension is 127.47 × 3.90² = 1,949.04 N.
B) The centripetal acceleration is given by:
a = v²/r
a = (3.90 m/s)²/7.10 m
a = 2.14 m/s²
Therefore, the magnitude of the centripetal acceleration is 2.14 m/s².
C) The speed of the basket and its passenger is 3.90 m/s.
D) The time it takes the basket to make one complete circle is given by:
T = 2πr/v
T = 2π(7.10 m)/3.90 m/s
T = 12.9 s
Therefore, it takes the basket 12.9 s to make one complete circle.
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if we say that the potential at the earth's surface is 0 v , what is the potential 1.6 km above the surface?
If we say that the potential at the earth's surface is 0 v , the potential 1.6 km above the surface is - 6.2 × 10^6 V.
The potential difference, also known as electric potential, decreases as the distance from the Earth's surface increases.
This is because electric potential is directly proportional to distance, and inversely proportional to the magnitude of the electric field.
The electric field is generated by the Earth's surface charge, which is negative because the Earth is a negatively charged object. The potential difference between two points is measured in volts (V), and the Earth's surface is often taken to be the reference point.
If the potential at the Earth's surface is taken to be 0 V, the potential 1.6 km above the surface can be calculated as follows:
The electric field generated by the Earth's surface charge is given by: E = kq/r²,
where k is Coulomb's constant, q is the surface charge of the Earth, and r is the distance from the center of the Earth.
The potential difference between two points is given by: V = Ed,
where d is the distance between the two points.
Thus, the potential at a point 1.6 km above the Earth's surface is:
V = E × d = kq/r² × d = (9 × 10^9 N·m²/C²) × (- 5.52 × 10^5 C)/[(6.38 × 10^6 m + 1.6 × 10^3 m)²] × (1.6 × 10^3 m)
= - 6.2 × 10^6 V.
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a 7.0 kg bowling ball moves at 2.20 m/s. how fast must a 2.2 g ping pong ball move so that the two balls have the same kinetic energy
The speed of the 2.2 g ping pong ball must be 3.43 m/s in order for it to have the same kinetic energy as the 7.0 kg bowling ball moving at 2.20 m/s
To calculate the speed of the 2.2 g ping pong ball so that it has the same kinetic energy as the 7.0 kg bowling ball moving at 2.20 m/s, use the equation KE = 1/2 mv2, where m is mass and v is speed.
Rearrange the equation to v = √(2KE/m).
Substituting the given values, we get:
v = √(2 * (1/2 * 7.0kg * 2.20m/s2) / 2.2g)
v = 2.20 m/s
Therefore, the speed of the 2.2 g ping pong ball has the same kinetic energy as the 7.0 kg bowling ball moving at 2.20 m/s.
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a box with a mass of 50 kg is accelerating to the right because of an applied force of 250 n friction between the box and the surface below is negligible. what is the acceleration? (in meters/sec2)
The acceleration of a box with a mass of 50 kg that is accelerating to the right due to an applied force of 250 N and with negligible friction between the box and the surface below is 5 m/s².
Acceleration is defined as the rate of change of velocity of a moving object over time. The magnitude of the velocity of the object changes at a constant rate as a result of acceleration. The acceleration of an object may be calculated using the following formula:
a = (Fnet)/m
where Fnet is the net force acting on the object, and m is the object's mass.
Therefore, using the formula;
a = (Fnet)/m
where m = 50 kg and Fnet = 250 N,
Therefore;
a = 250 N / 50 kg
a = 5 m/s²
Thus, the acceleration of the box is 5 m/s².
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if the total resistance of two motor windings connected in parallel is 20 ohms and 240v is applied to the circuit, how much current will flow?
The current I in the circuit will be 12A.
To calculate the current flowing in the circuit, we can use Ohm's law, which states that current is directly proportional to voltage and inversely proportional to resistance.
The total current flowing in the circuit is therefore given by Ohm's Law as:
I = V/R
where V is the voltage applied to the circuit and R is the total resistance of the two windings.
In this case, given that the voltage applied is 240V and the total resistance of the two windings is 20 ohms, the total current flowing in the circuit is given by:
I = 240/20 = 12A.
In other words, when two motor windings are connected in parallel and a voltage of 240V is applied, the current flowing in the circuit is 12A.
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a woman stands on a scale in a moving elevator. her mass is 61.8 kg, and the combined mass of the elevator and the scale is 816 kg. starting from rest, the elevator accelerates upward. during the acceleration, the hoisting cable applies a force of 9300 n. what does the scale read (in kg) during the acceleration?
The scale will read 708.2 kg during the acceleration.
This is because during the acceleration, the hoisting cable applies a force of 9300 N to the elevator. This force is equal to the sum of the masses of the woman and the elevator multiplied by the acceleration.
Since the combined mass of the elevator and the woman is 816 kg, the force is equal to 816 kg multiplied by the acceleration. Therefore, the scale will read the sum of the woman's mass (61.8 kg) and the elevator's mass (746.2 kg) multiplied by the acceleration. Therefore, the scale will read 708.2 kg during the acceleration.
In conclusion, the scale will read 708.2 kg during the acceleration because the hoisting cable applies a force equal to the sum of the masses of the woman and the elevator multiplied by the acceleration. This force is applied to the elevator, and the scale will read the sum of the woman's mass and the elevator's mass multiplied by the acceleration.
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just as the rock reaches point b , what is the normal force on it due to the bottom of the bowl? express your answer using two significant figures.
The normal force on the rock at point B due to the bottom of the bowl is 4.08 N.
Given Data:
Mass of the rock, m = 0.25 kg
The radius of the bowl, r = 0.30 m
Speed of the rock, v = 2.8 m/s
Acceleration due to gravity, g = 9.81 m/s²
So, the Normal force on the rock due to the bottom of the bowl can be calculated as:
N = mg - m(v²/r)
Putting the values of given data, we get:
N = (0.25 kg)(9.81 m/s²) - (0.25 kg)(2.8 m/s)²/(0.30 m)N = 2.45 N - 6.53 NN = 4.08 N
Approximately, N = 4.08 N
Thus, the normal force on the rock at point B due to the bottom of the bowl is 4.08 N.
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when a liquid is flowing through a pipe, frictional forces between the liquid and the wall of the pipe convert kinetic energy into thermal energy. what effect does this have on the pressure of the liquid within the pipe
Frictional forces between a liquid and the walls of a pipe can convert kinetic energy into thermal energy, leading to a drop in pressure within the pipe due to the decrease in force being applied to the walls.
Frictional forces between the liquid and the walls of a pipe can lead to the conversion of kinetic energy into thermal energy. This can have an effect on the pressure of the liquid within the pipe. Specifically, when the liquid loses kinetic energy due to friction, the pressure within the pipe drops. This drop in pressure can be attributed to the fact that as the liquid loses kinetic energy, its molecules move more slowly, thus decreasing the amount of force that is being applied to the walls of the pipe. As a result, the pressure within the pipe decreases.
In summary, frictional forces between a liquid and the walls of a pipe can convert kinetic energy into thermal energy, leading to a drop in pressure within the pipe due to the decrease in force being applied to the walls.
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a pendulum is measured to swing back and forth 15 times in 10 seconds. what is the length of the string?
The length of the string is 0.48 m.
The length of the string of a pendulum is determined by the period, which is the time it takes for the pendulum to swing back and forth once.
String length = (Gravitational acceleration x (Period)2) / (4π2)
Where Gravitational acceleration is the acceleration due to gravity, which is 9.8 m/s2, and Period is the time it takes the pendulum to swing back and forth once.
The period is 10 seconds divided by 15 swings, or 0.67 seconds.
String length = (9.8 m/s2 x (0.67 s)2) / (4π2) = 0.48 m.
Therefore, the length of the string is 0.48 m.
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the current in the circuit will approach a constant value ic after a long time (as t tends to infinity). what is ic ? express your answer in amperes.
The current I(r) at a time after 1*r equals the time constant r is roughly 0.065 A. About 0.105 A is the current I(3r) at a point three times the time constant after 3*r.
What is the circuit's current I?Electric current (I) flowing through a circuit directly relates to its potential difference (V). When the potential difference is 60 volts, the electric current is 1.5 amps.
The following equations can be used to calculate the current in the RL circuit based on the information provided:
An RL circuit's current is determined by:
I(t) = (V/R) * (1 - e(-t/r))
The following queries can be resolved using this equation:
Question 1:
What is the current I(r) after 1*r equals the time constant r?Add t = r to the equation as follows:
I(r) = (V/R) * (1 - e(-r/r))
I(r) = (V/R) * (1 - e(-1))
I(r) = (12.0/150) * (1 - e(-1))
I(r) ≈ 0.065 A
As a result, the current I(r) at a time after 1*r equals the time constant r is approximately 0.065 A.
Question 2:
What time is it now, I(3r), after 3*r, which is three times the time constant?
In the following equation, substitute t = 3r:
I(3r) = (V/R) * (1 - e(-3))
I(3r) = (12.0/150) * (1 - e(-3))
I(3r) ≈ 0.105 A
As a result, the current I(3r) at a time three times the time constant after 3*r is about 0.105 A.
Question 3:
After some time, the circuit's current will begin to approach a constant value, I. (as t tends to infinity). Who am I?
The exponential term e(-t/r) approaches 0 as t approaches infinity, and the current becomes:
I∞ = V/R
Substitute V = 12.0 V and R = 150 Ω into the equation:
I∞ = 12.0/150
I∞ = 0.08 A
As a result, after some time, the circuit's current will stabilize around 0.08 A.
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Question:
After the switch is closed, the current in the circuit grows over time approaching a constant value. In general, at time after a voltage source is connected to an RL circuit, the current I(t) in the circuit is given by the expression
1(t)=(1-e); where r = L/R
where & is the voltage provided by the battery, R is the resistance of the resistor, and r is the time constant characteristic of the circuit.
Growth of current in an RL circuit
Consider an R-L circuit as shown in the figure. The battery provides 12.0 V of voltage. The inductor has inductance L, and the resistor has resistance R = 150 . The switch is initially open as shown. At time r=0, the switch is closed. At time / after 0 the current /(1) flows through the circuit as indicated in the figure.
Question 1:
What is the current (r) at a time after 1-0 equal to time constant?
Question 2:
What is the current /(3r) at a time after 1-0 equal to three times the time constant?
Question 3:
The current in the circuit will approach a constant value / after a long time (as / tends to infinity). What is I.?
A machine is said to have low efficiency if it experiences a lot of energy loss to heat. How can a machine be made more efficient?
by increasing gravity
by increasing electrical energy
by reducing magnetic energy
by reducing friction
Answer:
by reducing friction
Explanation:
By reducing friction, a machine can be made more efficient. Friction causes energy loss in a machine, which reduces its efficiency. By reducing friction, less energy is wasted as heat, and more energy is utilized for the intended purpose of the machine.
a solid ball has a radius of 0.110 m and a mass of 1.88 kg how much force must be applied to the edge to give it an angular acceleration of 3.09
The given values in the equation, F = (0.0147) * (3.09)/0.110F = 0.414 N Thus, the force required to give an angular acceleration of 3.09 m/s² to the solid ball is 0.414 N.
Given, The radius of a solid ball (r) = 0.110 m The mass of the solid ball (m) = 1.88 kg The angular acceleration of the solid ball (α) = 3.09 m/s²Now, we need to find the force required to give an angular acceleration of 3.09 to the solid ball. So, we will use the formula for torque, Torque (τ) = Fr Where, r = radius of the solid ball F = force required to move the solid ball on the edge of the solid ball By using Newton's second law of motion, F = ma Where, m = mass of the solid ball a = angular acceleration of the solid ball By using the formula for torque, Torque (τ) = Frτ = IαWhere, I = moment of inertia of the solid ball By equating both equations, F * r = IαF = Iα/r By using the formula for moment of inertia of a solid ball, I = (2/5)mr²I = (2/5) * 1.88 * 0.110²I = 0.0147 kg m²Now, substituting the given values in the equation, F = (0.0147) * (3.09)/0.110F = 0.414 N Thus, the force required to give an angular acceleration of 3.09 m/s² to the solid ball is 0.414 N.
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compare violet and red light from the visible spectrum. you are currently in a labeling module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. which has the longer wavelength? which has the greater frequency? which has the greater energy? answer bank
In the following question, among the various parts to solve on visible spectrum.- A. Red light has a longer wavelength than violet light. B. Violet light has a higher frequency than red light. C. Violet light has greater energy than red light.
Violet and red light from the visible spectrum can be compared based on their wavelengths, frequencies, and energies. Violet light has a shorter wavelength, higher frequency, and greater energy than red light. The answers to the specific questions are: Which has the longer wavelength? Red light has a longer wavelength than violet light. Which has the greater frequency? Violet light has a higher frequency than red light. Which has the greater energy? Violet light has greater energy than red light. An HTML-formatted answer would look like this:
Violet and red light from the visible spectrum can be compared based on their wavelengths, frequencies, and energies. Violet light has a shorter wavelength, higher frequency, and greater energy than red light. The answers to the specific questions are:
Which has the longer wavelength? Red light has a longer wavelength than violet light.Which has the greater frequency? Violet light has a higher frequency than red light.Which has the greater energy? Violet light has greater energy than red light.For more such questions on visible spectrum.
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