 January 2005, Part 2
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21. A 60.0-kilogram runner has 1920 joules of kinetic energy. At what speed is she running?

(1) 5.66 m/s
(2) 8.00 m/s
(3) 32.0 m/s
(4) 64.0 m/s

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22. The diagram below shows points A, B, and C at or near Earth’s surface. As a mass is moved from A to B, 100. joules of work are done against gravity. What is the amount of work done against gravity as an identical mass is moved from A to C?

(1) 100. J
(2) 173 J
(3) 200. J
(4) 273 J

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23. When a force moves an object over a rough, horizontal surface at a constant velocity, the work done against friction produces an increase in the object’s

(1) weight
(2) momentum
(3) potential energy
(4) internal energy

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24. A motor used 120. watts of power to raise a 15-newton object in 5.0 seconds. Through what vertical distance was the object raised?

(1) 1.6 m
(2) 8.0 m
(3) 40. m
(4) 360 m

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25. In an electric field, 0.90 joule of work is required to bring 0.45 coulomb of charge from point A to point B. What is the electric potential difference between points A and B?

(1) 5.0 V
(2) 2.0 V
(3) 0.50 V
(4) 0.41 V

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26. In a flashlight, a battery provides a total of 3.0 volts to a bulb. If the flashlight bulb has an operating resistance of 5.0 ohms, the current through the bulb is

(1) 0.30 A
(2) 0.60 A
(3) 1.5 A
(4) 1.7 A

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Note that question 27 has only three choices.

27. A complete circuit is left on for several minutes, causing the connecting copper wire to become hot. As the temperature of the wire increases, the electrical resistance of the wire

(1) decreases
(2) increases
(3) remains the same

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28. A 1.5-volt, AAA cell supplies 750 milliamperes of current through a flashlight bulb for 5.0 minutes, while a 1.5-volt, C cell supplies 750 milliamperes of current through the same flashlight bulb for 20. minutes. Compared to the total charge transferred by the AAA cell through the bulb, the total charge transferred by the C cell through the bulb is

(1) half as great
(2) twice as great
(3) the same
(4) four times as great

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29. A 9.0-volt battery is connected to a 4.0-ohm resistor and a 5.0-ohm resistor as shown in the diagram below. What is the current in the 5.0-ohm resistor?

(1) 1.0 A
(2) 1.8 A
(3) 2.3 A
(4) 4.0 A

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30. A 100.-ohm resistor and an unknown resistor are connected in series to a 10.0-volt battery. If the potential drop across the 100.-ohm resistor is 4.00 volts, the resistance of the unknown resistor is

(1) 50.0 Ω
(2) 100. Ω
(3) 150. Ω
(4) 200. Ω

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31. If the potential difference applied to a fixed resistance is doubled, the power dissipated by that resistance

(1) remains the same
(2) doubles
(3) halves

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32. In the diagram below, proton p, neutron n, and electron e are located as shown between two oppositely charged plates. The magnitude of acceleration will be greatest for the

(1) neutron, because it has the greatest mass
(2) neutron, because it is neutral
(3) electron, because it has the smallest mass
(4) proton, because it is farthest from the negative plate

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33. Two protons are located one meter apart. Compared to the gravitational force of attraction between the two protons, the electrostatic force between the protons is

(1) stronger and repulsive
(2) weaker and repulsive
(3) stronger and attractive
(4) weaker and attractive

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34. A meson may not have a charge of

(1) +1e
(2) +2e
(3) 0e
(4) –1e

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35. A balloon is rubbed against a student’s hair and then touched to a wall. The balloon “sticks” to the wall due to

(1) electrostatic forces between the particles of the balloon
(2) magnetic forces between the particles of the wall
(3) electrostatic forces between the particles of the balloon and the particles of the wall
(4) magnetic forces between the particles of the balloon and the particles of the wall

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36. Which pair of graphs represents the same motion of an object? 1 2 3 4
37. The vector diagram below represents two forces, F1 and F2, simultaneously acting on an object. Which vector best represents the resultant of the two forces? 1 2 3 4
38. An egg is dropped from a third-story window. The distance the egg falls from the window to the ground is closest to

(1) 100 m
(2) 101 m
(3) 102 m
(4) 103

m
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39. Which unit is equivalent to a newton per kilogram?

(1) m/s2
(3) J•s
(2) W/m
(4) kg•m/s

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40. In the diagram below, a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +2q and is located 0.2 meter from the test charge. Sphere B has a charge of –2q and is located 0.1 meter from the test charge. If the magnitude of the force on the test charge due to sphere A is F, what is the magnitude of the force on the test charge due to sphere B?

(1) F/4
(2) 2F
(3) F/2
(4) 4F Additional Tests
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