# Homework Help: Centripetal Force Calc Question

1. Apr 21, 2012

### junkie_ball

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

Calculate the centripetal force required to rotate a 3Kg object in a circle at a radius of 3m at one revolution per second?

Ok for some reason i find circular motion a real struggle i have come up with an answer for this question but looking for some reassurance i am on the right lines.

2. Relevant equations

Fc = MV2/r

V = 2$\pi$r/t

3. The attempt at a solution

First i need to work out the velocity so i use V = 2$\pi$r/t

V = (2$\pi$ x 3)/1
V = 18.85 m/s1

With this i then used the Fc = MV2/r equation to work out the centripetal force as below.

Fc = (3 x 18.852)/3
Fc = 355.32 N

As i said at the beginning of this post i lack confidence in circular motion so would appreciate a pointer in the right direction if i have gone astray.

2. Apr 21, 2012

### Quinzio

It's just fine.

3. Apr 21, 2012

### junkie_ball

Thanks for the reassurance.