How would the kinetic energy of a flywheel (a spinning disk) change if its rotational inertia was five times smaller but its angular speed was five times larger

Question

Francis Moyer

Physics

6 August, 08:59

How would the kinetic energy of a flywheel (a spinning disk) change if its rotational inertia was five times smaller but its angular speed was five times larger

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Answers (1)

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Annalise Ramirez · Answer 1

Answer: This implies that it will be 5 times lesser than it was before

Explanation:

From kinetic energy = 1/2Iω² where I = rotational mass and ω = angular speed 1/2 x (5I) x (1/25ω²) = 1/5th of the original kinetic energy This implies that it will be 5 times lesser than it was before.