A neutron star is an extremely dense, rapidly spinning object that results from the collapse of a star at the end of its life. A neutron star of 1.8 times the Sun's mass has an approximately uniform density of 1× 1018kg/m3.
What is its rotational inertia?
The neutron star's spin rate slowly decreases as a result of torque associated with magnetic forces. If the spin-down rate is 5×10?5rad/s2, what is the magnetic torque?