Hovercraft problem

A hovercraft is hovering in the still air with power P. Now if all the dimensions of the hovercraft is made twice, then, what will be the required power?

Can't be determined 2 7 / 2 P 2^{7/2}P 2 5 / 2 P 2^{5/2}P 2 3 / 2 P 2^{3/2}P

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