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A coin, placed on a rotating turntable s...

A coin, placed on a rotating turntable slips, when it is placed at a distance of `9cm` from the center. If the angular velocity of the turnable is tripled, it will just slip, If its distance from the center is

A

27cm

B

9cm

C

3cm

D

1cm

Text Solution

Verified by Experts

The correct Answer is:
D
In the given condition friction provides the required centripetal force and that is constant i.e `m omega^(2) r` = constant
`r prop (1)/(omega^(2)) rArr r_(2)= r_(1) ((omega_(1))/(omega_(2)))^(2)= 9 ((1)/(3))^(2)= 1cm`
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