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Question

A fan has 3 blades. The edges of two blades are 1 m apart. A coin of mass 2 g is placed on one of the blade edge. If the fan rotates with 600 rpm, the force experienced by the coin is nearly

A
3.1 N
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B
4.6 N
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C
5.2 N
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D
2.8 N
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Solution

The correct option is C 4.6 N
Centrifugal force Fc acting on the particle is mω2r, i.e.,
Fc=mω2r and 2rsin60=1
r=13m

ω=600 rpm =600×π30s1=20π/s
Fc=0.002×(20π)2×13=4.55 N4.6 N.

176233_139639_ans_061884c827e24b0e817d02033c9ea7d0.png

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