Question

Calculate the moment of inertia of the sphere having a mass of 12 kg and radius of 78 cm.

(a) 7.888 kgm^2

(b) 7.300 kgm^2

(c) 7.545 kgm^2

(d) 7.552 kgm^2

This question was posed to me in an interview for job.

The query is from Dynamics topic in section Dynamics of Electrical Drives of Electric Drives

Answer 1

The correct option is (b) 7.300 kgm^2

For explanation: The moment of inertia of the egg can be calculated using the formula I=Σmiri^2. The mass of egg and radius is given. I=(12)×(.78)^2=7.300 kgm^2. It depends upon the orientation of the rotational axis.