A skateboard wheel has a radius of 2.08 inches and is turning at a rate of 945 rpm.
a. what is the angular speed in radians per second? in degrees per second?
b. how fast is the skateboard traveling (in miles per hour)?
(a) well, there are 2pi radians or 360 degrees per revolution.
(b) the circumference of the wheel is 2pi*2.08 inches. That's how far it moves on each revolution.