The angular velocity of a wheel increases from 1200 to 4500 rev/min in 10 sec.Compute its angular acceleration and number of revolution during this time.

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1.) Compare the equation of angular motion with the equation of linear motion.

2.) Define angular momentum.A planet revolves around a massive star in a highly elliptical orbit.Is its angular momentum constant over the entire orbit?

3.) A disc of moment of inertia 5 x 10^-4 kg m^2 is rotating freely about axis O through its centre at 40 rpm as shown in figure.Calculate the new revolution per minute(r.p.m) if some wax of mass 0.02kg is dropped gently on to the disc 0.08m from its axis.

4.) Write a relation between  moment of inertia and torque.

5.) Describe the work and power in rotational motion with their expression.