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A mass m on a friction less table is att...

A mass m on a friction less table is attached to a hanging mass M by a cord through a hole in the table . Then the angular speed with which m must spin for M stay at rest will be

A

` sqrt((Mg)/(mr))`

B

`sqrt((mg)/(Mr))`

C

`sqrt((mr)/(Mg))`

D

`sqrt((g)/(r))`

Text Solution

Verified by Experts

The correct Answer is:
A
C.F.=weight of body of mass M
`mr omega^(2)=Mg`
` omega ^(2)=(Mg)/(mr)`
`omega =sqrt((Mg)/(mr))`
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