Homework Help: Small Circular Acceleratioon Question

1. Oct 14, 2012

A wheel of 0.50 m radius rotates at 15 rev/s. What is the acceleration at its outer rim in m/s2

They want tangential acceleration right? Is there anyway to solve this without angular velocity/speed as we haven't learned that yet. This is part of the practice questions for my midterm on Work/Energy and Kinematics, so I'm looking for one of those methods to solve it.

The answer is 4.4x103 m/s2 but I can't seem to get that. Help?

2. Oct 14, 2012

lewando

What did you get and how did you get it?

3. Oct 14, 2012

I was using T=2piR/V to get V and then using that in a=V^2/R but a friend pointed out the 15 rev/s is frequency, and so I'm not sure of an equation for that.

4. Oct 14, 2012

lewando

T = 1/f. If the frequency is 15 revolutions/s, how many seconds would it take for 1 revolution? Your formula for acceleration is for radial acceleration, not tangential. Since the answer is non-zero, question refers to radial.

5. Oct 14, 2012

Yes I get that frequency means it will be 1/15 but what equation can I use to get tangential?

6. Oct 14, 2012

lewando

atangential = dV/dt.

7. Oct 14, 2012