Question Detail
Question
The moment of inertia about the axis passing through the centre of mass of a flywheel of radius 20 cm is 0.3 kg m². Calculate the mass of the flywheel mounted on a horizontal axle.
Correct Answer
Option C is the correct answer.
Detailed Explanation
For a solid cylinder (flywheel) about its axis, I = ½ M R². Given I = 0.3 kg m², R = 0.2 m. So 0.3 = ½ × M × (0.2)² = ½ × M × 0.04 = 0.02 M. Thus M = 0.3 / 0.02 = 15 kg.
Hint
Use the formula for moment of inertia of a solid cylinder about its axis.