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A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of the circle is 1.2 m, then tension in the string when the body is at the top of the circle is:

1. 41.56 N
2. 89.86 N
3. 109.86 N
4. 11.56 N

Correct answer: 41.56 N

Solution

At the top of the circle, the tension in the string and the gravitational force together provide the centripetal force. Using the formula T + mg = mv²/r, where v = 2πr × frequency, we calculate T = 41.56 N.

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