Question Detail
Question
The moment of inertia about the axis passing through the centre of mass of a flywheel of radius 20cm is 0.3 kgm². Calculate the mass of the flywheel mounted on a horizontal axle.
Correct Answer
Option C is the correct answer.
Detailed Explanation
For a flywheel (usually modeled as a solid disk), I = ½ MR². So 0.3 = ½ × M × (0.2)² = ½ × M × 0.04 = 0.02M. Therefore M = 0.3/0.02 = 15 kg.
Hint
Use I = ½ MR² for a solid disk. Convert radius to meters.