Ball in Horizontal Circle (Rotational Kinematics)

[PrideofPhilly]

Homework Statement

A ball at the end of a string of length 0.75 m rotates at a constant speed in a horizontal circle. It make 3 rev/s.

What is the period of the ball's motion?

What is the ball's angular velocity?

Homework Equations

w = delta theta/delta t

theta = 2*pi*r/r = 2*pi rad

The Attempt at a Solution

For period (in seconds):

(3 rev/1s)*(2*pi rad/1 rev) = 6*pi rad/s

(2*pi rad/1 rev)(1 s/6*pi rad) = 1/3 seconds

I don't know where to go from here? Did I find the period in the correct manner?

 

[LowlyPion]

Your period is OK.

More simply it is 3 revs in 1 sec, so ...1 rev in 1/3 sec.