Question Detail
Question
The moment of inertia about the axis passing through the centre of mass of a flywheel of radius 20cm is 0.3kgm². 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, I = (1/2)MR². So, 0.3 = (1/2) × M × (0.2)² = (1/2) × M × 0.04 = 0.02M. Therefore, M = 0.3 / 0.02 = 15 kg.
Hint
Use the moment of inertia formula for a solid cylinder about its central axis: I = ½ MR².