# Rotation with constant acceleration

1. Dec 7, 2004

### gunnar

A flywheel has mass 40 kg and diameter 75 cm is spinning at 500 rpm. During 30 sec the wheel slows down due to friction. The wheel makes 200 complete revolutions during the 30 sec.
At what rate is the wheel spinning at the end of the 30 sec?

Can somebody help with this problem please?

2. Dec 7, 2004

### Staff: Mentor

Use the kinematic equations for uniform acceleration to solve for the acceleration, and then the final speed. For example, you can start with the rotational analog of this equation: $x = x_0 + v_0t + 1/2at^2$.

3. Dec 8, 2004

### gunnar

Thank's a lot. Really saved me there.