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31 August, 03:06

A mass M tied to a light string is moving in a vertical circle. The tension in the string at the top is TT and TB at the bottom of the circle. The work done by the tension on M as it moves from bottom to top is:

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  1. 31 August, 03:19
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    Tension provides centripetal force in the circular motion. In circular motion work done by force = torque x angle

    torque is zero as, centripetal force passes through axis of rotation that is center.

    So work done by centripetal force = 0

    So work done by tension on M = 0
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