Law of conservation of angular momentum

(A) : The spin angular velocity of a star is greatly enhanced when it collapse under gravitiational pull and become a neuton star. (R ) : According to law of conservation of angular momentum there is increase in angular velocity of collapsing star.

Two dics of moments of inertia I_1 and I_2 about their respective axes (normal to the disc and passing through the centre), and rotating with angular speed omega_1 and omega_2 are brought into contact face to face with their axes of rotation coincident. Does the law of conservation of angular momentum apply to the situation? Why?

Give the law of conservation of a angular momentum.

Torgue and angular momentum relation, Application of conservation of angular momentum.

Assertion : In keplar's law conservation of angular momentum does not take place. Reason : Gravitation force acting between earth and the sun is perpendicular to line joining them.