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A gramophone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is 0.5. The coin will revolve with the record without slipping if: (g is acceleration due to gravity)
A
r = gω²/2
B
r < 2ω²/g
C
r ≤ g/2ω²
D
r > g/2ω²
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