Question

Let I1 an I2 be the moments of inertia of two bodies of identical geometrical shape, the first made of aluminium and the second of iron.
(a) I1 < I2
(b) I1 = I2
(c) I1 > I2
(d) relation between I1 and I2 depends on the actual shapes of the bodies.

Answer 1

Answer:

option d is correct that is relation between 11 and 12 depends on the actual shape of the bodies .

Answer 2

The first made of aluminium and the second of iron is I1 < I2.

Explanation:

In the case in point we have :

                    Momentum of inertia ∝ Density

The iron density is greater; hence, I2 will be greater.

Because, Aluminum has a density lower than iron and therefore the first body has less mass than the second.

And if the bodies have the same forms as the momentum of inertia is directly proportional to the mass.

Thus the first body has lower momentum of inertia than the other body.

Therefore, option (a) is the correct answer.