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Q.

A wheel rotates at 50 rpm about its axis. The angular retardation that can stop the wheel in oneminute ·is

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a

π36rads-2

b

π18rads-2

c

π72rads-2

d

π9rads-2

answer is A.

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Detailed Solution

The initial angular velocity,ω0=50rpm=5π3rads-1using  ω∣=ω0+αt∵  α=ω-ω0t=0-5π360rads-2=-π36rads-2
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