A flywheel of moment of inertia (9.8 mathrm{~kg} cdot mathrm{m}^{2}) fluctuates by (30 mathrm{rpm}) for a fluctuation

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A flywheel of moment of inertia \(9.8 \mathrm{~kg} \cdot \mathrm{m}^{2}\) fluctuates by \(30 \mathrm{rpm}\) for a fluctuation in energy of 1936 Joules. The mean speed of the flywheel is (in rpm)

(a) 600

(b) 900

(c) 968

(d) 2940 .

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