# What is an example of a rotational dynamics practice problem?

##### 1 Answer

Sep 7, 2015

I am going to give you a practice problem which is an application of rotational motion to real life.

Try and solve the problem and ask me if you are stuck then I will help you and give you the answer.

#### Explanation:

Sri Lankan cricketer Muttiah Muralitharan holds the world record for the most wickets ever – 800!

During a delivery he spins a cricket ball (solid sphere of mass 155 g and diameter 4,2 cm) such that it leaves his hand rotating at 8 revs/sec and moving forward at 80 km/hr. Determine the force and torque required to achieve this, as well as the total kinetic energy of the ball as it leaves his hand.

Picture credit : Google SA