A machine part has the shape of a solid uniform sphere of mass 225 g and diameter 2.90 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 0.0200N at that point.
A machine part has the shape of a solid uniform sphere of mass 225 g and diameter 2.90 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 0.0200N at that point.
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Transcribed Image Text:A machine part has the shape of a solid uniform sphere of
mass 225 g and diameter 2.90 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.
Part A
Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of rotation.
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Express your answer in radians per second squared.
Eνα ΑΣφ
?
a =
rad/s?
Part B
How long will it take to decrease its rotational speed by 21.0 rad/s ?
Express your answer in seconds.
Πνα ΑΣφ
?
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