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A block of mass m is placed on a vertica...

A block of mass m is placed on a vertical fixed circular track and then it is given velocity v along the track at position A on track. The coefficient of friction between the block and the track varies with the angle `theta` . If the block moves on track with constant speed then the coefficient of friction is

A

`mu=(sintheta)/(cottheta+(v^(2))/(Rg))`

B

`mu=(sintheta)/(costheta+(v^(2))/(Rg))`

C

`mu=(tantheta)/(costheta+(v^(2))/(Rg))`

D

`mu=(costheta)/(tantheta+(v^(2))/(Rg))`

Text Solution

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The correct Answer is:
B
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