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A machine part has the shape of a solid uniform sphere of mass 225 g and diameter 3.30 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 0.0200 N at that point.How long will it take to decrease its rotational speed by 28.0 rad/s ?Express your answer in seconds.

Question

A machine part has the shape of a solid uniform sphere of mass 225 g and diameter 3.30 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 0.0200 N at that point.

How long will it take to decrease its rotational speed by 28.0 rad/s ?
Express your answer in seconds.
check_circleAnswer
Step 1

The angular accele...

2
5
5f
5x(-0.02)
2(0.225)(0.033/2)
--13.47 rad/s
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2 5 5f 5x(-0.02) 2(0.225)(0.033/2) --13.47 rad/s

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