A body of mass \( m \) is tied to a string and whirled in a vertical circle. The difference in tension at the lowest and highest point is:

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1. A body of mass \( m \) is tied to a string and whirled in a vertical circle. The difference in tension at the lowest and highest point is:

1. \( 2mg \)2. \( mg \)3. \( 0 \)4. \( \frac{mv^2}{r} \)

2. A particle is moving in a horizontal circle with constant speed. The net work done by the centripetal force is:

1. Positive2. Negative3. Zero4. Variable

3. If a stone is whirled in a vertical circle and the string breaks at the lowest point, the stone will:

1. Move vertically upward2. Move tangentially forward and upward3. Move radially outward4. Fall vertically downward

4. A ball tied to a string is whirled in a horizontal circle. The tension in the string provides:

1. Tangential acceleration2. Centripetal acceleration3. Gravitational force4. Angular momentum

5. A string can withstand a tension of 100 N before breaking. What is the maximum speed with which a 2 kg mass can be whirled in a horizontal circle of 1 m radius?

1. 5 m/s2. 10 m/s3. 7 m/s4. 6 m/s

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A body of mass \( m \) is tied to a string and whirled in a vertical circle. The difference in tension at the lowest and highest point is: