<PRE><B>Question 428931</B>
A cars tires are moving at 550 revolutions per minute while the car travels at 55mph.
 What is the radius (in inches) of the wheels?
:
Find the inches per minute
{{{(55*5280*12)/60}}} = 58080 in/min
:
Find the inches per revolution
{{{58080/550}}} = 105.6 inches, the circumference of the tire
:
Find the radius
{{{2*pi*r}}} = 105.6
r = {{{105.6/(2*pi)}}}
r = 16.81 inches is radius of the tire</PRE>