Question

Calculate the moment of inertia of the stick about its end having a mass of 22 kg and length of 22 cm.

(a) .088 kgm^2

(b) .087 kgm^2

(c) .089 kgm^2

(d) .086 kgm^2

This question was posed to me in final exam.

Question is taken from Methods to Reduce the Energy Loss During Starting topic in portion Starting of Electric Drives

Answer 1

Correct answer is (b) .087 kgm^2

The explanation: The moment of inertia of the stick about its end can be calculated using the formula I=ML^2÷3. The mass of the stick about its end and length is given. I = (22)×.33×(.11)^2 =.087 kgm^2. It depends upon the orientation of the rotational axis.