A rotating star has a period of 30 days about an axis passing through its centre. The star undergoes an internal explosion and converts to a neutron star. Initial radius of the core was `1.0xx10^(4)` km, whereas, final radius is `3.0km`. Determine the period of rotation of the neutron star.

A ring of mass 10 kg and diameter 0.4m is rotated about an axis passing through its centre and perpendicular to its plane moment of inertia of the ring is

A ring of mass 10kg and diameter 0.4m is rotated about an axis passing through its centre. If it makes 1800 revolutions per minute then , the angular momentum of the ring is

A spherical solid ball of 1 kg mass and radius 3 cm is rotating about an axis passing through its centre with an angular velocity of 50 rad s^(-1) . The kinetic energy of rotation is

A circular ring rotating about an axis passing through its centre and perpendicular to its plane is making 300 revolutions/min. What will be the kinetic energy of rotation of the ring if mass of ring is 0.3 kg and radius 0.4 m.

A disc of mass 2 kg and radius 0.2 m is rotating about an axis passing through its centre and perpendicular to its plane with an angular velocity 50 rad/s . Another disc of mass 4 kg and radius 0.1m rotates about an axis passing through its centre and perpendicular to its plane with angular velocity 100 rad/s. If the two disc are coaxially coupled, then the angular velocity of coupled system would be

A circular disc of mass 2 kg and radius 0.1 m is rotating at an angular speed of 2 rad/s, about an axis passing through its centre and perpendicular to its plane. What is its rotational kinetic energy?

A neutron star has a density equal to that of the nuclear matter. Assuming the staar to be spherical, find the radius of a neutron star whose mass is 4.0xx10^30 kg (twice the mass of the sun ).

A massive star is spinning about its diameter with an angular speed omega_(0) = (pi)/(1000) rad/day. After its fuel is exhausted, the star collapses under its own gravity to form a neutron star. Assume that the volume of the star decreases to 10^(-12) times the original volume and its shape remains spherical. Assuming that density of the star is uniform, find the angular speed of the neutron star.

Certain neutron stars are believed to be rotating at about 1rev//sec . If such a star has a radius of 20 km , the acceleration of an object on the equator of the star will be