Question

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

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.