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[" The free end of a thread wound on a b...

[" The free end of a thread wound on a bobbin is passed round a nail A hammered into the "],[" wall.The thread is pulled at a constant velocity "V" .There is no slipping at any contact "],[" point.Then speed "V_(0)" of centre of the bobbin at the instant when the thread form an "],[" angle "alpha" with the vertical will be? "],[qquad ((n pi))/(VR))^(n)],[((n pi)/(sqrt(R)))^(n)*V^(n)*(Vr)/(V^(n))]

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