A flywheel of moment of inertia 9.8 kg m2 fluctuates by

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A flywheel of moment of inertia 9.8 kg m² fluctuates by 30 rpm for a fluctuation in energy of 1936 Joules. The mean speed of the flywheel is (in rpm)

1. 600
2. 900
3. 968
4. 29470

Correct Option: A

∆E = mR²ω²∆S
= mR²ω(ω₁ – ω₂)

∴ 1936 = 9.8 × ω		2π	× 30
		60

or Mean speed of flywheel, ω= 600 rpm