Three 3.0-W resistors are connected in parallel to a 12.0-V battery. What is the current in any one of the resistors?
a. 0.75 A
c. 4.0 A
b. 12 A
d. 1.3 A
[Ques. 2] A 2.0-kg mass in the xy plane is moving in the negative x direction at 3.0 m/s along the line y = 5.0 m. As the mass passes across the y axis (i.e., passing the point (x, y = 0, 5.0 m)), what is its angular momentum with respect to the z axis?
a. 30 SI units
c. -30 SI units
b. 150 SI units
d. -150 SI units
[Ques. 3] Four 8.0-W resistors are connected in parallel. What is their equivalent resistance?
a. 4.0 W
c. 2.0 W
b. 0.50 W
d. 32 W
[Ques. 4] The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At the point closest to the Earth:
a. the angular speed will be greatest although the linear speed will be the same.
b. the speed will be greatest although the angular speed will be the same.
c. the kinetic energy and angular momentum will both be greater.
d. None of the above.
[Ques. 5] If R1 < R2 < R3, and if these resistors are connected in series in a circuit, which one dissipates the greatest power?
a. R1
c. R2
b. R3
d. All are equal in power dissipation.
[Ques. 6] The Earth's gravity exerts no torque on a satellite orbiting the Earth in an elliptical orbit. Compare the motion of the satellite at the point nearest the Earth (perigee) to the motion at the point farthest from the Earth (apogee). At these two points:
a. the tangential velocities are the same.
c. the angular momenta are the same.
b. the angular velocities are the same.
d. the kinetic energies are the same.
[Ques. 7] Three resistors, each with resistance R1, are in series in a circuit. They are replaced by one equivalent resistor, R. Comparing this resistor to the first resistor of the initial circuit, which of the following is true?
a. The voltage across R equals the voltage across R1.
b. The current through R equals the current through R1.
c. The power given off by R equals the power given off by R1.
d. R is less than R1.
[Ques. 8] Consider the use of the terms rotation and revolution. In physics:
a. the words are used interchangeably.
b. the words are used interchangeably but rotation is the preferred word. c. the words have different meaning.
d. rotation is the correct word, and revolution should not be used.
[Ques. 9] Three resistors connected in series have individual voltages labeled DV1, DV2, and DV3, respectively. Which of the following expresses the value of the total voltage DVT taken over the three resistors together?
a. DVT = (1/DV1 + 1/DV2 + 1/DV3)
c. DVT = (1/DV1 + 1/DV2 + 1/DV3)-1
b. DVT = DV1 = DV2 = DV3
d. DVT = DV1 + DV2 + DV3
[Ques. 10] A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
a. the hoop
c. the cylinder
b. the sphere
d. All go the same distance.
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