# Uniform Circular Motion.

1. Jan 24, 2010

### Muneerah

1. The problem statement, all variables and given/known data

What angular speed (in revolutions per
minute) is needed for a centrifuge to produce
an acceleration of 675 times the gravitational
acceleration 9.8 m/s2 at a radius of 15.4 cm?

2. Relevant equations
ac=4 pi2 r f2

3. The attempt at a solution
ok so first I found the acceleration which is 110.25 m/m2 and I converted the radius to meters r= .154 m then I solved for the frequency = ((110.25)/(4pi2.154))1/2 = 1979.137 rpm

2. Jan 24, 2010

### xcvxcvvc

9.81 m/s^2 * 675 does not equal 110.25 m/m2

3. Jan 24, 2010

### Muneerah

Yeah, I fixed the acceleration and I got 3906900m/m2 and blugged it in again, and my answer was still wrong.

4. Jan 24, 2010

### sezw

umm acceleration is m/s/s not m/m/m

5. Jan 24, 2010

### Muneerah

I had to convert it, because they're asking for the angular speed in rev/minute

6. Jan 24, 2010

### sezw

what kind of physics are you taking?