Q.

If the frequency of the rotating platform is v and the distance of a boy from the centre is r, what is the area swept out per second by the line connecting the boy to the centre ?

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a

2πr2v

b

πr2v

c

2πrv

d

πrv

answer is C.

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Detailed Solution

Question Image

dA=12r x l=12r2x ϕ

dAdt=12r2dt=12r2 x ω

=12r2 x 2πv=πr2v

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If the frequency of the rotating platform is v and the distance of a boy from the centre is r, what is the area swept out per second by the line connecting the boy to the centre ?