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

A block of mass m is placed on a circular track and then it is given a velocity `upsilon` vertically downwards at position A on track. If block moves on track with constant speed, then

A

(a)Coefficient of friction between block and circular track as function of angle `theta` is `mu=(sintheta)/(cottheta+v^(2)/(Rg))`

B

(b)Coefficient of friction between block and circular track as function of angle `theta` is `mu=(sintheta)/(costheta+v^(2)/(Rg))`

C

(c)Instantaneous power due to friction is `-mgv sin theta`

D

(d)Work done from A to C by friction on block will be `-mgR`

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The correct Answer is:
B, C, D
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