A circular disc is rotating with a varying speed u =(2t-4) m/s, where t is in second. An object is placed in the disc. The pseudo fore on the object is

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is maximum at t = 2 sec.

is minimum at t = 2 sec

is zero at t = 2 sec

None of the above

answer is B.

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Detailed Solution

Total acceleration of the disc aT2+aR2 and pseudo force depends on net acceleration.aT=2 m/s2aR=u2/R at t =2sec u=0 aR=0

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