A coin is kept at distance of 10 cm from the centre of a circular turn table. If µ = 0.8 , the frequency of rotation at which the coin just begins to slip is
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a
62.8 rpm
b
84.54 rpm
c
54.6 rpm
d
32.4 rpm
answer is B.
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Detailed Solution
So revolution per minute of the disc N =0.8×9.80.1 ×602π=84.54 rpm