# Homework Help: Angular Speed

1. Jun 19, 2005

### melissa_y

A solid sphere of radius 13.0 cm and mass 12.0 kg starts from rest and rolls without slipping a distance of L = 7.0 m down a house roof that is inclined at 32o. What is the angular speed about its center as it leaves the house roof? Use units of "rad/s".

2. Jun 19, 2005

### himanshu121

the Forum helps u, if u show us that u have worked upon anyway
solve torque equation
$$\Sigma \tau_{cm} =I \alpha$$
$$\Sigma F= Ma$$
Use condition of rolling
$$a_{cm}=\alpha R$$

Last edited: Jun 19, 2005