A steam engine of \(100 \mathrm{~kW}\) runs at \(100 \mathrm{rpm}\). The speed of the engine is to be maintained within \(1 \%\) variation in mean speed. The flywheel has a mass of \(2000 \mathrm{~kg}\) and radius of gyration of \(1 \mathrm{~m}\). Determine the coefficient of fluctuation of energy.