<PRE><B>Question 506513</B>
a water wheel has a 10 ft 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. what is the speed of the river in miles per hour?
:
Find the circumference of the wheel
C = {{{2*pi*10}}}
C = 62.83 ft
IN one minute
14 * 62.83 = 879.646 ft
:
In mph
{{{((60*879.646))/5280}}} ~ 10 mph </PRE>