under certain conditions, the thrust T of a propeller varies jointly...

Question

...as the fourth power of it's diameter, d, and the square of the number, n, of revolutions per second.

What happens to the thrust if n is doubled and d is halved?

Answer 1

T=k*d^4*RPM^2

d kut in half & RPM dubel

yu get (1/2)^4*2^2

or (1/2)^2....1/4