SOLUTION: During RAGBRAI 2012, there was large hill going into Cherokee. My bike reached a speed of 36 miles per hour. My bike tires have a radius of 14 inches. If I maintained this spee

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Question 1092521: During RAGBRAI 2012, there was large hill going into Cherokee. My bike reached a speed of 36 miles per hour. My bike tires have a radius of 14 inches. If I maintained this speed for 30 seconds, how many revolutions did my bike tire make?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
My bike reached a speed of 36 miles per hour.
My bike tires have a radius of 14 inches.
Find the circumference of the tire
C = 2%2Api%2A14
C = 87.9646 inches
:
If I maintained this speed for 30 seconds, how many revolutions did my bike tire make?
there are 120 30 sec periods in an hour
Find the no. of inches traveled in 1 hr at 36 mph, divide by the period and the circumference
R = %2836%2A5280%2A12%29%2F%28120%2A87.9646%29
R = 216.1 rev