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13.Two spheres of mass M and radius R are both released from rest at the top of a hill and allowed to roll to the bottom. One of the spheres is hollow however, while the other is solid. Which of the spheres reaches the bottom first? A) The hollow one B The solid one C) They reach the bottom at the same time D) It depends on the angle of inclination. E) It depends on the length of the inclined surface. レ14 Imagine you are spinning on a frictionless stool while holding weights in each of your outstretched hands. What happens to your angular speed if you let go of both weights? A) It decreases B) It remains the same It increases 15. A solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 3.5 rad/'s. What is its kinetic energy? A)0.18J 0092J C)06J D) 1.05E053 16. A person pushes on a doorknob with a force of 5.00 N. The direction of the force is at an angle of 20.0° from the perpendicular to the surface of the door. The doorknob is located 0.800 m from axis of the hinges of the door. The door begins to rotate with an angular acceleration of 2.00 rad/s2. What is the moment of inertia of the door about the hinges? A)4.28 kgm2 B)7.52 kgm2 C)1.88 kgm2 D)0.684 kgm' )274kg m 17. A person sits on a freely spinning lab stool (no friction). When this persorn 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.

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