The power can be expressed as:

$\overline{){\mathbf{P}}{\mathbf{=}}\frac{\mathbf{m}\mathbf{g}\mathbf{h}}{\mathbf{t}}}$

(the work done against gravity divided by the time).

The motor of a crane uses power P to lift a steel beam. By what factor must the motor's power increase to lift the beam twice as high in half the time?

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