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A coin of 4 g mass is placed at a distan...

A coin of 4 g mass is placed at a distance of 2 cm from the axis of rotation a disc,. If the frequancy of disc is 180 rpm, then the coefficient of friction between the coin at rest and disc will be

A

`0.07249`

B

`7.249`

C

`72.49`

D

`0.7250`

Text Solution

Verified by Experts

The correct Answer is:
D
`cf=mu mg therefore mu =(r omega ^(2))/(g)=0.7250`
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