Two men of equal masses stand at opposite ends of the diameter of a turntable disc of a certain mass, moving with constant angular velocity. The two men make their way to the middle of the turntable at equal rates. In doing so
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a
kinetic energy of rotation has increased while angular momentum remains the same.
b
kinetic energy of rotation has decreased while angular momentum remains same.
c
kinetic energy of rotation has decreased but angular momentum has increased.
d
both kinetic energy of rotation and angular momentum have decreased
answer is A.
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Detailed Solution
I1ω1=I2ω2Since, men move towards middle of turn table I2 decreases hence ω2 increases.So kinetic energy increases and angular momentum remains constant.
Two men of equal masses stand at opposite ends of the diameter of a turntable disc of a certain mass, moving with constant angular velocity. The two men make their way to the middle of the turntable at equal rates. In doing so