Question

Two spherical masses of mass 2kg each are connected by a light thin rod of length 50cm. Calculate its rotational inertia:

a. about an axis normal to it through its centre

b. about an axis at one of it ends

Answer 1

a. $I=2mr^2=1\text{ kg}·\text m^2.$

b. $I=m(2r)^2=2\text{ kg}·\text m^2.$