Question

Two spherical masses each of mass 2kg are connected by a loght rod of lenght 50cm,calculate its rotational inertia.

(i) about an axis normal to it through iys center

(ii) about an axis at one of its ends

Answer 1

1.

$I=\frac{md^2}2=0.25~kg\cdot m^2,$

2.

$I=\frac{2md^2}3=0.33~kg\cdot m^2.$