A truck driver travels at 60 mph. The truck tires have a diameter of 26 inches. What is the angular velocity of the wheels in revolutions per second?
60 mph = 1056 in/sec
r = 13 in
$\displaystyle \omega = \frac{v}{r}$
the above equation will get you the angular velocity, $\displaystyle \omega$ , in radians per second ... you'll have to convert it to revolutions per second ... note that there are $\displaystyle 2\pi$ radians in one revolution.