PH 117 University of California Physics Exam Questions

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PH 117

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PH 117 Final Exam Spring 2020 Name____ 1. Chris pulls a wagon 20 m horizontally with a force of 50 N directed at an angle as depicted in the sketch. How much work does Chris do on the wagon? (A) 1000 J (B) 800 J (C) 600 J 50 N 30 N 40 N (D) 1400 J 20 m 2. Consider a ball thrown straight up in the air that eventually falls to the ground. (A) At what position is its kinetic energy the greatest?_________________________________ (B) At what position is its gravitational energy the greatest? _________________________________ 3. When driving an ordinary internal combustion engine car over the mountains what happens to the gravitational energy that the car had at the top of a mountain when it comes to rest at the bottom of the mountain? 4. When the speed of a moving car is doubled, how much more kinetic energy does it get? 5. Does an automobile use more gasoline if the radio volume is turned up while driving on the highway? 6. On a cold day, why does a metal doorknob feel colder to the touch than the wooden door? 7. The textbook lists three forms of thermal energy transport, but Dr. Johnson made a big deal about saying only two of them are distinct processes with the third being efficient use of the other two. Which process did Dr. Johnson say was not unique? 8. Twice this semester we talked about the greenhouse effect (in two very different chapters). Some of the radiation energy is absorbed by the material inside the greenhouse.What happens to the rest of the radiation energy? 9. Which type of thermal energy transport does our sun use to warm the Earth? (A) conduction (B) convection (C) radiation (D) other things 10. Why is iron magnetic, but aluminum is not? 11. What is always needed to make a magnetic field? (A) any magnetic material (B) Iron (C) Electric charge (D) Moving charges 12. Why do residents of Mexico get less cosmic radiation than residents of Canada? 13.Why do scientists believe that the Earth’s magnetic field is not produced by permanent magnets inside the Earth? 14. How is the paper cone of a speaker made to vibrate in order to produce sound? 15. How are Aurora formed? 16. How does placing iron inside a solenoid affect the magnetic field produced when current flows through the solenoid? 17. Why does an electric motor draw more current and overheat when it is prevented from spinning? 18. How does an electric guitar pickup work? 19. Why is electric power produced at the electric company sent to the towns using it at extremely high voltages? 20. Why are the coils in an electric motor wound around an iron frame if an aluminum frame would be less expensive and much lighter weight? 21.Why is it wrong to say that a generator is a source of energy? 22.Which of the following does a transformer change between its input and its output? (A) Current (B) Power (C) Energy (D) Voltage 23. What is the principal advantage of ac over dc?
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Explanation & Answer

here are the answers. this was a simple test for me

PH 117 Final Exam Spring 2020 Name……………………………….
1.

Chris pulls a wagon 20 m horizontally with a force of 50 N directed at an angle as

depicted in the sketch. How much work does Chris do on the wagon?

800 J

2. Consider a ball thrown straight up in the air that eventually falls to the ground.
(A) At what position is its kinetic energy the greatest?
Kinetic energy is greatest at a point just before hitting the ground

Position is its gravitational energy the greatest?
Gravitational energy is greatest at a maximum vertical height

3. When driving an ordinary internal combustion engine car over the mountains what
happens to the gravitational energy that the car had at the top of a mountain when it comes
to rest at the bottom of the mountain?
The gravitational energy of the car will be slightly lower at the bottom of the mountain

4. When the speed of a moving car is doubled, how much more kinetic energy does it get?

When the speed of the car is doubled kinetic energy multi...


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