A disc revolves with a speed 
rev/ min, and has a radius of 15 cm. Two coins A and B are placed at 4 cm and 14 cm away from the centre of the disc. If the coefficient of friction between the coins and the disc is 0.15, which of the coins will revolve with the record?
Text Solution
Verified by ExpertsA
: Here, 
The coin will revolve with the disc, if the force of friction is enough to provide the necessary centripetal force
As 
For the given 
and 
the condition is
For coin A, r=4 cm
The above condition is satisfied, therefore coin A will revolve with the disc.
For coin B, r = 14cm
The above condition Is not satisfied, therefore coin B will not revolve with the disc
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