# Centripital Acceleration question

1. Jan 25, 2005

### DLxX

A mass on the end of a 1.07 m string moves at 2.64 revolutions per second. What is the magnitude of the centripetal acceleration in m/s/s?

How would I go about solving that? What really confuses me is the 2.64 revolutions per second, so if anyone could explain that I'd appreciate it. I have the Centriptial Acceleration formula but I dont know how to use Rev/s.

2. Jan 25, 2005

### Curious3141

I presume you know the formula $$a = - r\omega^2$$ ?

$\omega = 2\pi f$ where $f$ is the frequency in Hertz, or number of revolutions per second.