How to solve this problem?

enter image source here

1 Answer
Oct 27, 2017

2,439 kw (rounded)

Explanation:

"varies directly as the cube of the wind speed S" means that
P=cS3, where c is some constant you don't know, yet.

But you can derive it, since you are told that when S = 27, P = 750

750=c(273)=c(19,683)
...therefore c=75019683 = .0381 (rounded)
...so then you can plug in 40:

P=.0381(403)=.0381(64000)=2,439kw (rounded)

GOOD LUCK