Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. (The density of a neutron star is roughly 10¹4 times as great as that of ordinary solid matter.) Suppose we represent a star as a uniform, solid, rigid sphere, both before and after the collapse. Also assume that mass of the star is conserved during the collapse. The star's initial radius before collapse is 7.0 ×105 km (comparable to our sun); its final radius after collapse is 16 km. If the original star rotates once in 30 days, what is the angular speed of the neutron star resulting from the collapse?

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.