# Rotational Speed

## Homework Statement

Tire with a radius of 40cm spinning at 2500 rev/min. What is the rotational speed?

## Homework Equations

w=v/r
w=2500revmin/40cm

Does that sound right? I am confused

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Er... rev/min is a rotational speed.

Im not too sure what you are trying to work out.

Okay. Thats the exact problem I have on my sheet. I asked a few others and they said that the rev/sec is the rotational speed.

Look at your formula, and look at the units involved.

That will find a linear velocity at the outer edge of that ball, not rotational.

Thanks for the help!