Answer the Questions:

1. What is the power of a 100 V toaster connected to a 12 A outlet?
2. How much work will be done if the toaster in question #2 runs for 20 seconds?
3. Suppose you slowly move a bar magnet near a coil of wire. You then move the bar magnet near the coil of wire twice as fast. How did the current in the wire differ the second time?
4. When you rub a balloon on your hair, the hairs stand on end and separate from each other. Why does this happen?
5. What is the current of a circuit with a 9 V battery and a 10 Ohm resistor?
6. A transformer is given an input voltage of 100 V and contains 50 turns of wire in the primary. How many turns must the secondary contain to give an output of 120 V? What type of transformer is this?
7. Suppose two electrons are sitting 10 cm away from each other. If I move them so that they are now 30 cm away from each other, how much has the force between them decreased?
8. What is the speed of light in diamond (n = 2.42)? Why does the speed of light change when light passes through material that is denser than air?
9. Using Snell's Law: if n₂ > n₁, what is the relationship between ₁ and ₂?
10. How does a concave mirror work?
11. A comet is traveling in outer space with a velocity of 2000 m/s. How long will it take to travel 300,000 meters?
12. An object has an initial velocity of 15 m/s. How long must it accelerate at a constant rate of 3 m/s² before its final velocity is equal to twice its initial velocity?
13. The brakes on an elevator of weight 50,000 N act upward with a force of 100,000 N The acceleration of elevator while braking would be _____.
14. Which of the following statements is Newton's Third Law of Motion?
15. An object is moving in a circle of radius 2 m at a constant speed of 5 m/s. What is its acceleration?
16. Centripetal Acceleration is:
17. A change in temperature of 50^oC is equal to a change of ___.
18. Which of these is not a state of matter
19. A piece of steel expands 10 cm when it is heated from 20 to 40 deg C. How much would it expand if it was heated from 20 to 60 deg.C?
20. A pendulum has a period of 5 seconds. What is its frequency?
21. The velocity of sound in a certain medium is 1000 m/s. If sound wave has a frequency of 500 hz, the wavelength would be _____________.
22. An X ray and a the red light from a laser
23. Ohm's Law states that:
24. Energy is measured in units of
25. Which of the following is the Carnot Efficiency?
26. In order to double kinetic energy, the speed should be
27. A diver climbs up the stairs to the diving tower. The work he does climbing the stairs is:
28. For a given person, as the time needed to run up a flight of stairs decreases, the power ___.