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 
. If the block moves on track with constant speed then the coefficient of friction is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Since the block is moving with a constant speed, at any instant its tangential acceleration is zero. Hence,
f = mgsmd
Also, 
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