As you are trying to move a heavy box of mass [tex]m[/tex], you realize that it is too heavy for you to lift by yourself. There is no one around to help, so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. You pull up on the rope to lift the box.(adsbygoogle = window.adsbygoogle || []).push({});

A.) What is the magnitude [tex]F[/tex] of the upward force you must apply to the rope to start raising the box with constant velocity?

Express the magnitude of the force in terms of [tex]m[/tex], the mass of the box.

I think the answer should be mg/2

is this correct?

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# Homework Help: Energy Required to Lift a Heavy Box

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