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Moment of Inertia of a Disc

A wheel is ro...

Question

A wheel is rotating with an angular speed of 750 r.p.m. on a shaft. Another identical wheel is suddenly coupled on the same shaft. The frequency of the system will be ( assuming M.I. of shaft to be neglishible)

A

375 r.p.m.

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B

750 r.p.m.

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C

500 r. p. m.

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D

163 r.p.m.

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Solution

The correct option is B 750 r.p.m.
$N = 750 r . p . m$
As there is no change in M.O.I , so frequency remain on changes.
Hence, the answer is $750 r . p . m .$

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