Two identical cylindrical disks have a common axis. Initially one ofthe disks is

Question

Two identical cylindrical disks have a common axis. Initially one ofthe disks is into contact they stick together Which of the spinning. When the two disks are brought following is true? A) The totalkinete energy and the total angular unchanged from their BO Both the total kinetic enery and the total angular momentum are reduced to halfef their original values. )The total angular momentum is unchanged, but the total kinetic eneray is reduced to half its original value. D) The total angular momentum is reduced to half is original value, but the total kinetic energy is unchanged. E) The total angular momentum is unchanged and the total kinetic energis reduced to of its original value. A man is walking north carrying a suitcase that contains a spinning gyroscope mounted on an axle attached to the front and back of the case. The angular velocity of the gyroscope points north. The man now begins to tum to walk east. As a result, the front end of the suitcase A) twists around the north-south axis, BO fights his attempt to tum and pulls to the west. C rises upward. D) dips downward. E) does nothing whatever unusual. Please answer from top to bottom A solid cylinder isspinning counterclockwise about a longitudinalaxis when a net torque is applied, as shown. The cylinder A) rotates faster. precesses about horizontal axis. B) rotates slower. E) does none of these. C precesses about a vertical axis. fan object suddenly shrink and decrease its moment of inertia by a factor of3. what is the ratio of the final and initialrotational kinetic energies? A 3 B09 A ball of mass m is tied with a light string to a vertical post of radius R, and slides on a frictionless horizontal surface. As the ball travels around the post, the string wraps around the post, shortening the length. At 0s, its speed is v, and radius isr, As the string wraps around the post, which ofthe following statements is true? A) Angular mamentum is conserved but not the mechanical energy. B Angular momentum is not conserved but the mechanical energy is conserved. Both the angular momentum and the mechanical energ are conserved D)Angular mamentum increases as the string gets shorter. Whether the angular momentum and mechanaal encrp are conserved depends on v.

Explanation / Answer

E) the angular momentum is conserved when the two disks are bought together but the kinetic energy is not conserved because the system loses energy to friction between the two disks.

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