Question

Question 5. Consider the following four obiects: a hoop, a flat disk,a solid sphere, and a hollow sphere. Each of the objects has mass M and radius R. The axis of rotation passes through the center of each object, and is perpendicular to the plane of the hoop and the plane of the flat disk. Which of these objects requires the largest torque to give it the same angular acceleration? A) the hoop D) the flat disk B) the hollow sphere E) both the solid and the hollow c) the solid sphere spheres Question 6. In analyzing the equilibrium of a flat, rigid object, you are about to choose an axis about which you will calculate torques. Which of the following describes the choice you should make? a. The axis should pass through the object's center of mas b. The axis should pass through one end of the object c. The axis should be either the x axis or the y axis. d. The axis should pass through any point within the object. e. Any axis within or outside the object can be chosen. Question 7. Which one of the following statements concerning simple harmonic motion is false? a) The displacement versus time graph for an object in simple harmonic motion resembles the sine or cosine function. b) A restoring force acts on an object in simple harmonic motion that is directed in the same direction as the object's displacement. c) The amplitude of the object in simple harmonic motion is the maximum distance the object moves from its equilibrium position. d) During simple harmonic motion, the net force on the object is zero newtons when it is at its equilibrium position. e) A restoring force acts on the object that is proportional to the object's displacement from its equilibrium position. Question 8. What happens when a spinning ice skater draws in her outstretched arms? a) Her moment of inertia decreases causing her to speed up. b) Her angular momentum decreases. c) The torque that she exerts increases her moment of inertia. d) Her angular momentum increases e) Her moment of inertia decreases causing her to slow down.

Answer 1

We know angular accele ration Moment of inertia Torque is Same T will be oject for which Iis lrnest Larjest for the In the given situation Moment of inertia of MR2 Hap disk MR2 Solidsphere 2 mR2 Hollow sphere MR2 from the above we see that Moment af inertia of Heopis larest There fore Tarque will be larjest for hoop oPtion "A" is covrect