COMEDK · Physics · 8. Rotational Motion
A singer, during his performance, stands on the edge of a circular turntable, and begins to walk along its edge with a speed of \(1.5\ ms^{-1}\) relative to the ground. The turn table is mounted on a frictionless vertical axle. Its radius R = 3m and its moment of inertia about the axle is 150 kg m². It is initially at rest. If the mass of the singer is 75kg, the time taken by the man to complete one revolution is:
- A \(20.5\)s
- B \(8.56\)s
- C \(6.28\)s
- D \(12.57\)s
Answer & Solution
Correct Answer
(D) \(12.57\)s
Step-by-step Solution
Detailed explanation
Given: Speed of the singer relative to the ground, \(v = 1.5\text{ m s}^{-1}\) Radius of the circular turntable, \(R = 3\text{ m}\) The problem asks for the time taken by the singer to complete one revolution. Since the speed of the singer is given relative to the ground, the…
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