Thread: hey guys, need some help with a take home sheet
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Old April 2nd, 2007, 12:36 PM
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Originally Posted by Stuck686 View Post
5) if a mechanical horse is moving around a circlular track with radius 200 yards at 20mph, how many revolutions per day does the horse make?
how many yards are in a mile? again we consult google, we find:
1 mile = 1760 yards

so the horse travels at 20(1760) yards per hour = 35200 yards per hour

that is 35200(24) yards per day = 844800 yards per day


now what is the circumference of the track?

C = 2pi*r = 2pi*200 = 400 pi yards

so revs in one day = 844800/400pi revs = 2112/pi revs
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