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Energy and Its Forms
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Gravity
Unit Test 1
Terms in this set (86)
An eagle carries a fish up 50 m into the sky using 90 N of force. How much work did the eagle do on the fish? (Work: W = Fd)
4500 J
Tina and her puppy are tugging on a rope, each pulling on opposite ends.
When is Tina doing work?
whenever she pulls the puppy toward her
Which term is the rate at which work is done?
power
During a workout, a football player pushes a blocking dummy a distance of 30 m. While pushing the dummy the same distance a second time, what would the player need to change to be certain that power output increases?
The player would need to use a greater force and take less time.
A lawnmower engine running for 20 min does 4,560,000 J of work. What is the power output of the engine? (Power: P = W/t)
3800 W
Power is measured in which unit?
watts
Force and distance are used to calculate work. Work is measured in which unit?
joules
Four students were loading boxes of food collected during a food drive. The force that each student exerted while lifting and the distance each box was lifted are listed in the table. Which lists the students in order from the greatest amount of work done to the least? (Work: W = Fd)
Mika, Chet, Sara, Bill
Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd)
2 m
If 600 J of work is done in 3 s, what is the power? (Power: P = W/t)
200 W
If Jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, what is being done?
work
Which statement best describes the work and energy in these examples?
Example 1: Running a car requires gas.
Example 2: Humans require food to live.
The gas and food are examples of energy.
Gabriel is performing an experiment in which he is measuring the energy and work being done by a ball rolling down a hill. Which statement best describes Gabriel's measurements?
They will both be recorded in joules.
Johanna is studying what happens to the energy as a ball rolls down a ramp. What is one form of energy that she is studying?
gravitational potential energy
Four people make observations recorded in the table.
Which best describes what all of the observations have in common?
They involve changes in energy.
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Verified questions
PHYSICS
Find the separation of two points on the Moon’s surface that can just be resolved by the 200 in. (= 5.1 m) telescope at Mount Palomar, assuming that this separation is determined by diffraction effects. The distance from Earth to the Moon is $$ 3.8 × 10^5 km $$ . Assume a wavelength of 550 nm for the light.
PHYSICS
Imagine an iron sphere of radius R that carries a charge Q and a uniform magnetization $\vec{M}=M\mathbf{\hat{z}}$. The sphere is initially at rest. (a) Compute the angular momentum stored in the electromagnetic fields. (b) Suppose the sphere is gradually (and uniformly) demagnetized (perhaps by heating it up past the Curie point). Use Faraday's law to determine the induced electric field, find the torque this field exerts on the sphere, and calculate the total angular momentum imparted to the sphere in the course of the demagnetization. (c) Suppose instead of demagnetizing the sphere we discharge it, by connecting a grounding wire to the north pole. Assume the current flows over the surface in such a way that the charge density remains uniform. Use the Lorentz force law to determine the torque on the sphere, and calculate the total angular momentum imparted to the sphere in the course of the discharge. (The magnetic field is discontinuous at the surface...does this matter?)
PHYSICS
We showed how Fourier series could be used to represent a periodic function. Here we wish to apply that analysis to a vibrating string. Assume that a string of length l of mass per unit length $\mu$ is stretched horizontally between two supports and held with tension $F_{0}$. Assume that the middle of the string is displaced a distance a (where a <<l) in the vertical direction. When the string is released, it vibrates in a standing wave pattern. Use Fourier analysis to calculate the pattern of vibration as a function of time, that is calculate the Fourier coefficients of the series needed to describe the motion.
PHYSICS
Sketch the pattern around two point charges of $+ 1 \mu \mathrm { C }$ and $- 2 \mu \mathrm { C }$, placed close together.
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