SOLUTION: A water wheel has a 10ft radius. To get a good approximation of the speed of the river, you count the revolutions of the wheel and find that it makes 14 revolutions per minute (rpm

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Question 132482: A water wheel has a 10ft radius. To get a good approximation of the speed of the river, you count the revolutions of the wheel and find that it makes 14 revolutions per minute (rpm). What is the speed of the river?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A water wheel has a 10ft radius. To get a good approximation of the speed of the river, you count the revolutions of the wheel and find that it makes 14 revolutions per minute (rpm). What is the speed of the river?
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Circumference = 2(pi)10 = 20(pi) ft.
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14 revolutions = 14*20pi = 280pi ft/min = 879.646.. ft/min
= 0.166599... mph
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Cheers,
stan H.