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Q. No.A bob is whirled in a horizontal plane by means of a string with an initial speed of \(\omega\) rpm. The tension in the string is \(T\). If speed becomes \(2\omega\) while keeping the same radius, the tension in the string becomes:
| 1. | \(4 T\) | 2. | \(\dfrac{T}{4}\) |
| 3. | \(\sqrt{2} T\) | 4. | \(T\) |
Subtopic: Â Uniform Circular Motion |
 67%
Level 2: 60%+
NEET - 2024
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A bob is whirled in a horizontal circle by means of a string at an initial speed of \(10\) rpm. If the tension in the string is quadrupled while keeping the radius constant, the new speed is:
| 1. | \(20\) rpm | 2. | \(40\) rpm |
| 3. | \(5\) rpm | 4. | \(10\) rpm |
Subtopic: Â Uniform Circular Motion |
 68%
Level 2: 60%+
NEET - 2024
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A block of mass \(10~\text{kg}\) is in contact with the inner wall of a hollow cylindrical drum of radius \(1~\text{m}.\) The coefficient of friction between the block and the inner wall of the cylinder is \(0.1.\) The minimum angular velocity needed for the cylinder, which is vertical and rotating about its axis, will be:
\(\left(g= 10~\text{m/s}^2\right )\)
| 1. | \(10~\pi~\text{rad/s}\) | 2. | \(\sqrt{10}~\pi~\text{rad/s}\) |
| 3. | \(\dfrac{10}{2\pi}~\text{rad/s}\) | 4. | \(10~\text{rad/s}\) |
Subtopic: Â Uniform Circular Motion |
 69%
Level 2: 60%+
NEET - 2019
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