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Q.

A wheel at rest has M.I. 2π2kgm2 It is rotated by a 60W motor for one minute. The number of rotations made by the wheel in one minute is

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a

90

b

450

c

1800

d

1200

answer is C.

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Detailed Solution

p=τθt;                θ=2πNp×t=12Iω2ω=2ptI θ=2πN=ω t
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A wheel at rest has M.I. 2π2kgm2 It is rotated by a 60W motor for one minute. The number of rotations made by the wheel in one minute is