The sphere of mass M and radius R in FIGURE P12.76 is

Chapter 12, Problem 12.123

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QUESTION:

The sphere of mass M and radius R in FIGURE P12.76 is rigidly attached to a thin rod of radius r that passes through the sphere at distance  from the center. A string wrapped around the rod pulls with tension T. Find an expression for the spheres angular acceleration. The rods moment of inertia is negligible.

                                                   

                                                                   FIGURE P12.76

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QUESTION:

The sphere of mass M and radius R in FIGURE P12.76 is rigidly attached to a thin rod of radius r that passes through the sphere at distance  from the center. A string wrapped around the rod pulls with tension T. Find an expression for the spheres angular acceleration. The rods moment of inertia is negligible.

                                                   

                                                                   FIGURE P12.76

ANSWER:

Step 1 of 3

The equation for the torque applied on the rod is as follows:

                                                                     

The equation for the torque on the system is as follows:

                                                                     

On solving equating (1) and (2),

                                                                     

 

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