Question

What is the moment of inertia of a rod about an axis passing through the centre and perpendicular to its central axis? Given that mass of rod is 1kg, length = 10cm.

(a) 0.00083kgm^2

(b) 0.0833kgm^2

(c) 0.0033kgm^2

(d) 0.00033kgm^2

This question was posed to me in final exam.

My question is based upon Moment of Inertia topic in chapter System of Particles and Rotational Motion of Physics – Class 11

Answer 1

Correct answer is (a) 0.00083kgm^2

Best explanation: Let the moment of inertia be I.

And M & I be the mass and length of rod respectively.

For the given condition,

I = MI^2/12

= 1*0.01/12 = 0.00083kgm^2.