RE-NEET 2024 Physics Centripetal Force MCQ Question
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:
20 rpm
40 rpm
5 rpm
10 rpm
Correct Answer
Detailed Explanation
The speed of the bob is proportional to the square root of the tension in the string. Quadrupling the tension doubles the speed, so the new speed is 20 rpm.
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