A flywheel of a gasoline engine is required to give up 500J of kinetic energy while its angular velocity decreases from 650 rev/min to 520 rev/min.What moment of inertia is required?

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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.