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A particle of mass m is released from re...

A particle of mass `m` is released from rest from point `P` at `x = x_(0)` on X-axis from origin `O` and falls vertically along y-axis as shown in Fig. What is the magnitude of the torque acting on the particle at time `t`, when it is at the point `Q w.r.t.O` ?

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Refer to Fig.
Magnitude of torque is
`tau = r F sin theta = r xx mg xx (x_(0))/(r ) = mg x_(0)`
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