Ann the Astronaut weighs 60 kg. She is space-walking outside the space shuttle and pushes a 270-kg satellite away from the shuttle at 0.90 m/s. What speed does this give Ann as she moves toward the shuttle?
a. 4.0 m/s
c. 8.5 m/s
b. 5.3 m/s
d. 9.0 m/s
[Ques. 2] When charging two objects by rubbing them together:
a. neither may be a conductor.
b. the heat produced by friction is a necessary part of this process.
c. they must be made of different material.
d. they will sometimes end up with both being positively charged.
[Ques. 3] The law of conservation of momentum is applicable to systems made up of objects described by which of the following?
a. macroscopic
c. interacting through friction
b. microscopic
d. All the above choices are valid.
[Ques. 4] When a glass rod is rubbed with silk, which of the following statements best describes what happens?
a. Electrons are removed from the rod. c. The silk remains neutral.
b. Protons are removed from the silk.
d. The silk is charged positively.
[Ques. 5] A 75-kg swimmer dives horizontally off a 250-kg raft initially at rest. If the diver's speed immediately after leaving the raft is 2 m/s, what is the corresponding raft speed?
a. 0.2 m/s
c. 0.6 m/s
b. 0.3 m/s
d. 4.0 m/s
[Ques. 6] Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result?
a. One object is negatively charged and the other is uncharged. b. One object is positively charged and the other is uncharged. c. One object is positively charged and the other is negatively charge.
d. All of the above could result in such attraction.
[Ques. 7] Two masses m1 and m2, with m1 = 3 m2, undergo a head-on elastic collision. If the particles were approaching with speed v before the collision, with what speed are they moving apart after collision?
a. v
c. 3v/4
b. v/3
d. 3v
[Ques. 8] The combination of two separated point charges of opposite sign but equal magnitude is called an electric:
a. magnapole.
c. quadrapole.
b. dipole.
d. monopole.
[Ques. 9] A soccer ball (mass = 0.43 kg) is moving at a speed of 20 m/s when it is kicked with a force of 300 N resulting in it going in the opposite direction with the same speed as before. What is the magnitude of the impulse delivered to the ball?
a. 0, because the before and after momenta cancel each other.
b. 8.6 kgm/s
c. 17 kgm/s
d. 2600 kgm/s
[Ques. 10] A ping-pong ball covered with a conducting graphite coating has a mass of 2.5 10-3 kg and a charge of 4.0 C. What electric field directed upward will exactly balance the weight of the ball? (g = 9.8 m/s2)
a. 6.1 103 N/C
c. 5.1 106 N/C
b. 2.0 10-7 N/C
d. 1.2 104 N/C
Quick Reply
