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A mass 'm' is revolving in a vertical circle at the end of a string of length 1 m. Find difference between the tension at the lowest point and the tension at the highest point.

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T1 = T2 = m21/r + mg + = m/r (v21 + gr)

T2 = LH  = m/r(v21 - 2gh) + mg({r - h}/{r})

Since h = 2r

We have, T2 = m/r(v21 - 4gr) + mg({r - 2r}/{r})

= m/r(v21 - 4gr) - mg

Therefore, T1 - T2 = m/r(v21 + gr) - m/r(v21 + 4gr) + mg

= 6 mg

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