SOLUTION: The tires on a car have a diameter of 27 inches. The car runs over a pebble, which sticks inside the tread of one of the tires. If the pebble on the tire rotates at a speed of 4

Algebra ->  Length-and-distance -> SOLUTION: The tires on a car have a diameter of 27 inches. The car runs over a pebble, which sticks inside the tread of one of the tires. If the pebble on the tire rotates at a speed of 4       Log On


   

Question 1089534: The tires on a car have a diameter of 27 inches. The car runs over a pebble, which sticks inside the tread of one of the tires. If the pebble on the tire rotates at a speed of 4 revolutions per second, find the speed of the car in miles per hour.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The tires on a car have a diameter of 27 inches.
The car runs over a pebble, which sticks inside the tread of one of the tires. If the pebble on the tire rotates at a speed of 4 revolutions per second, find the speed of the car in miles per hour.
:
Find the circumference, mult by the rev per sec, times 3600 sec in a hr
Divide by 12 and 5280
:
%28%28pi%2A27%2A4%2A3600%29%29%2F%28%285280%2A12%29%29 = 19.3 mph