1.

by this fÜrce.9, An object of' mass m is tied to a string of length Iand a variable force F is applied on it whichbrings the string gradually at angle θ with theicaf Find the work done by the force F.Im

Answer»

From work energy theorem, since change in Kinetic energy is zero, the total work done by all forces must be equal to zero.

That means, WF+ Wg= 0

WF= –Wg= mgL(1 – cos theta)



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