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Quiz7a - of the orbit is the torque about the sun exerted...

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Physics 53 Quiz #7a Fall 2007 Name ___________________________ Recit. Section _______ Circle the correct answer: 1. [3 points] Consider the following two statements: (1) If the net force on a system is zero, then the net torque is also zero. (2) If the net torque on a system is zero, then the net force is also zero. Which statement is correct? a) Both (1) and (2) are true. b) Only (1) is true. c) Only (2) is true. d) Both (1) and (2) are false. 2. [3 points] Two spinning disks have the same angular momentum, but disk 1 has more rotational kinetic energy than disk 2. Which disk has the larger moment of inertia? a) Disk 1. b) Disk 2. c) It depends on their relative mass. d) It depends on their relative size. 3. [2 points] Halley’s comet orbits the sun on a strongly elliptic orbit. At which point(s)
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Unformatted text preview: of the orbit is the torque about the sun exerted by the gravitational force on the comet at its maximum? a) At the point of greatest distance from the sun (aphelion). b) At the point of closest approach to the sun (perihelion). c) At the two points intermediate between aphelion and perihelion. d) The torque is always zero. 4. [2 points] Two spheres have the same radius and the same mass. One is made of solid aluminum, and the other is made of a hollow shell of gold. Which sphere has the larger moment of inertia about an axis through its center? a) The sphere made of aluminum. b) The sphere made of gold. c) Both have the same moment of inertia....
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