Question

Multiple Choice (select the best answer) (2 pts each 1. Consider a uniform hoop of radius R and mass M rolling without slipping. Which is larger, its translational kinetic energy or its rotational kinetic energy? A) Translational kinetic energy is larger B) Rotational kinetic energy is larger. C) Both are equal. D) You need to know the speed of the hoop to tell. 2. A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. If both are uniform, which one reaches the bottom of the incline first if there is no slipping? The hoop The disk C) Both reach the bottom at the same time. 3. Five forces act on a rod that is free to pivot at point P, as shown in the figure. Which of these forces is producing a counter-clockwise torque about point P? A) force A B) force B C) force C D) force D E) force E 4. At a certain instant, a compact disc is rotating at 210 rpm. What is its angular speed in rad/s? 11 rad/s 22 rad/s C) 45 rad/s D) 69 rad/s E) 660 rad/s 5. A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms A) her moment of inertia decreases and her angular speed increases. B) her moment of inertia decreases and her angular speed decreases. C) her moment of inertia increases and her angular speed increases. D) her moment of inertia increases and her angular speed decreases. E) her moment of inertia increases and her angular speed remains the same.

Answer 1

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