<PRE><B>Question 108753</B>
the power P, in watts per hour, generated by a windmill with winds blowing v miles per hour is given by
P(v)= 0.015v^3 
a) find the power generated by 15-mph 
P(15) = 0.015v^3 = 0.015(15^3) = 50.625 watts
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b) how fast must the wind blow in order to generate 120 watts of power in one hour? 
120 = 0.015v^3
120/0.015 = v^3
v = 20 mph
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Cheers,
Stan H.
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