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Calculate the moment of inertia of the disc having a mass of 1 kg and radius of 1 m.(a) 1 kgm^2(b) .5 kgm^2(c) 2 kgm^2(d) 3 kgm^2The question was posed to me in quiz.This intriguing question comes from Effect of Starting on Power Supply, Motor and Load in chapter Starting of Electric Drives

Answer» CORRECT OPTION is (b) .5 kgm^2

The explanation is: The moment of inertia of the disc can be calculated using the formula I=mr^2×.5. The mass of the disc and DIAMETER is given. I=(1)×.5×(1)^2=.5 kgm^2. It depends upon the orientation of the ROTATIONAL axis.


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