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A small coin is kept at the rim of a h...

A small coin is kept at the rim of a horizontal circular disc which is set into rotation about verticle axis passing through its centre. If radius of the disc is `5 cm and mu_(s)=0.25`, then the angular speed at which the coin will just slip off at

A

` 5 rad//s`

B

`7 rad//s`

C

`10 rad//s`

D

`4.9 rad//s`

Text Solution

Verified by Experts

The correct Answer is:
B
`v=sqrtmu r g and omega =(v)/(r)`
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