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Unformatted text preview: a) The angular momentum of the platform stays constant. b) The angular momentum of the person stays constant. c) The sum of the angular momenta of the platform and the person stays constant. d) None of the above. 3. [4 points] A solid disk of mass 4 kg and 10 cm radius rolls (without slipping) down a 30 ° incline, which is 6 m long. What is the velocity of the center of mass of the disk when it arrives at the bottom of the incline? [Hint: The moment of inertia I of a solid disk of mass M and radius R is I = 1 2 MR 2 . Use g = 10 m/s 2 .] a) 4.47 m/s. b) 6.32 m/s. c) 7.75 m/s. d) 8.94 m/s. 4. [2 points] An object at rest begins to rotate with a constant angular acceleration. If this object rotates through 720º in 8.00 seconds, through what angle did it rotate in the first 4 seconds after it started rotating? a) 180º. b) 270º. c) 360º. d) 540º....
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