# Homework Help: Rotation of Rigid bodies

1. Jul 28, 2009

### Amar.alchemy

1. The problem statement, all variables and given/known data

A cord is wrapped around the rim of a solid uniform wheel 0.250 m in radius and of mass 9.20 kg. A steady horizontal pull of 40.0 N to the right is exerted on the cord, pulling it off tangentially from the wheel. The wheel is mounted on frictionless bearings on a horizontal axle through its center. Find the magnitude and direction of the force that the axle exerts on the wheel

2. Relevant equations
Newtons laws

3. The attempt at a solution
I understand that there are normal force and weight along y-axis. However i'm confused whether there is any x-component force exerted by the axle on the wheel. Kindly explain me??

2. Jul 28, 2009

### RoyalCat

I might be wrong as I haven't reached this subject matter just yet, but I think you need to take into consideration the fact that there is 0 linear translation of the center of mass.

Another force is suddenly required.

3. Jul 29, 2009

### Amar.alchemy

can u plz explain it with little more details??

4. Jul 29, 2009

### RoyalCat

The center of mass isn't moving, what does that say about the net force acting on the mass?