Centripital Acceleration question

[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.

[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.