1. Jan 9, 2008

### Omlette

1. The problem statement, all variables and given/known data
A small 650 gram ball on the end of a thin light cord is rotated in a horizontal circle of radius 1.2 m. Calculate the torque needed to keep the ball rotating at a constant angular velocity if air resistance exerts a ofrce of 0.020 N. Ignore the rod's moment of intertia and air resistance.

2. Relevant equations

T= Ia(alpha)

3. The attempt at a solution

Well I found the moment of inertia but Im stuck on where to go next. Please help me!

2. Jan 9, 2008

### olgranpappy

calculate the torque due to the air resistance using your other equation for torque