Question

A ball is tied at the end of a rope and swings in a circle at a constant speed, doing 60 revolutions a minute. What is the frequency, which period does this movement have?

Answer 1

The frequency of rotation, $f$ means how many rotations take place in a certain amount of time.

$f=\frac{60}{1} min^{-1} =\frac{60}{60} s^{-1}=1s^{-1}$

Period, T:

$T=\frac{1}{f} \\ T=1 s \\ Answer: f=1s^{-1}, T=1s$