9. Give the expression of work done in rotational motion.
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so here is the answer
Work done by force is calculated as the dot product of force and displacement of point of application of force. In case of angular motion, force is replaced by torque and linear displacement is replaced by angular displacement. Thus, W = ∫ τ ⃗ ⋅ d θ ⃗ .
sorry came late as the net is slow
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