Answer to Question #174050 in Physics for Andu

Question #174050

A round body measures 5 kg and has a radius of 30 cm. What moment of force should be exerted on it to increase the frequency from 5 rpm to 10 rpm, in 4 seconds?

Expert's answer

"\\tau=I\\alpha=\\frac{2}{5}mr^2\\\\\\tau=\\frac{2}{5}(5)(0.3)^2\\frac{2\\pi}{60}\\frac{10-5}{4}=0.0236\\ Nm"

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