Question

5.The power a windmill obtains from the wind varies directly as the cube of the wind velocity. If a wind of 10 km per hr produces 10,000 units of power, how much power is produced by a wind of 15 km per hr?

Answer 1

Call the power $p$, setup a proportion using given info and solve the unknown :

$\frac{10000}{10^3}~=~\frac{p}{15^3}$

$10~=~\frac{p}{3375}$

$p=33750$