<PRE><B>Question 863288</B>
A car travels at 60 miles per hour for 30 minutes. The radius of the tires on the car is 12 inches.
a. How far has the car traveled?
Dist = speed * time
d = 60 * 1/2
d = 30 mi which is 30*5280 = 158,400 ft
:
b. How many times does each tire rotate in the 30 minutes of driving?
The diameter of the tire is 2 ft
C = {{{pi*2}}}
c = 6.2832 ft
Find the no. of rotations
{{{158400/6.2832}}} = 25,210 revolutions
:
c. What is the rate of rotation (in rpm, rotations per minute) of the tires?
{{{25210/30}}} = 840.34 rev/min</PRE>