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A wooden plank OA rotates in vertical pl...

A wooden plank OA rotates in vertical plane about horizontal axis through O with a constant angular velocity `omega = 3 `rad/s . As it passes the position `theta = 0 ` , a small mass m is placed upon it at a radial distance `r = 0*5` m . If the mass m starts sliding at ` theta = 37^(@)` , find the coefficient of friction between mass and the plane .

A

0.1875

B

0.3

C

0.25

D

0.55

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The correct Answer is:
A
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