A machine part has the shape of a solid uniform sphere of mass $235$ g and diameter $2\mathrm{.}70$ cm $.$ It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of $0\mathrm{.}0200$ N at that point.

For related problem$-$solving tips and strategies, you may want to view a Video Tutor Solution of An unwinding cable ii$.$

Part A

Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of rotation.

Express your answer in radians per second squared.

$$

Request Answer

Part B

How long will it take to decrease its rotational speed by $22\mathrm{.}0ra\frac{d}{s}?$

Express your answer in seconds.

$t=,s$

nView?assignmentProblemID$=203900947$

Provide Feedback