# Determine the rotation period of a disc with 2m radio , that

1. Sep 28, 2015

### DexterV

1. The problem statement, all variables and given/known data
Determine the rotation period of a disc with 2m radio , that makes 20 rotations per minute.

2. Relevant equations

3. The attempt at a solution
I did T= 60/20 to find the period , but is that it ? what about the 2m?

2. Sep 28, 2015

### Monsterboy

Rotation period is the time taken for one complete rotation. You already know the time taken for 20 rotations( 1 min) , so it doesn't matter what radius it has , simply calculate time taken for one complete rotation.The answer is correct (60/20 = 3 seconds)

3. Oct 3, 2015

thank you !