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

[DexterV]

Homework Statement

Determine the rotation period of a disc with 2m radio , that makes 20 rotations per minute.

Homework Equations

The Attempt at a Solution

I did T= 60/20 to find the period , but is that it ? what about the 2m?

 

[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)

 

[DexterV]

thank you !