Help with Arc circle question??

theadage

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Feb 28, 2013
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How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60mi/hour

I know the answer is 21,609 but I don't understand how to get it.

I've been on this problem for 30+ minutes. >.<

S= r*theta

I know the radius is 14, and half an hour is 30mi/h

I don't understand how to derive the rest. Thank you.
 
How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60mi/hour

I know the answer is 21,609 but I don't understand how to get it.

I've been on this problem for 30+ minutes. >.<

S= r*theta ................................ need some definitions .........................What is S?......... what is r?........... What is theta (Θ)?

I know the radius is 14, and half an hour is 30mi/h

I don't understand how to derive the rest. Thank you.

.
 
How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60mi/hour

I know the answer is 21,609 but I don't understand how to get it.

I've been on this problem for 30+ minutes. >.<

S= r*theta
uou
I know the radius is 14, and half an hour is 30mi/h
No, if you are driving at 60 mi/hour, in half an hour you will have gone 30 mi.

I don't understand how to derive the rest. Thank you.
What is the circumference of a wheel with diameter 28 inches? Each revolution, the car will move forward that distance. How many times will that distance divide into 30 miles?
 
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