Question 558492
An automobile wheel 78 cm in diameter rotates at the rate of 600 revolutions per minute.  What is the speed of the car in km/hr?
---------------
78 cm = 0.78 meters
Circumference = 0.78*pi m
600C = 600*0.78pi m/min = 468pi m/min = 0.468pi km/min
= 0.468pi*60 km/hr
= 28.08pi km/hr