Kinetic energy of rotation of a flywheel of radius 2 m , mass 8 kg and angular speed 4 rad s - 1 about an axis perpendicular to its plane and passing through its center is

Question

Kinetic energy of rotation of a flywheel of radius 2 m , mass 8 kg and angular speed 4 rad s - 1 about an axis perpendicular to its plane and passing through its center is, 128 J, 196 J, 256 J, 392 J

MARKS App · Accepted Answer

Given that Mass of wheel m = 8 kg radius r = 2 m Angular speed ω = 4 rad s - 1 Rotational kinetic energy of wheel k = 1 2 I ω 2 ⇒ k = 1 2 m r 2 2 ω 2 ⇒ k = 1 2 8 × 4 2 4 2 = 128 J

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