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AP Physics C: Mechanics
3.5 Power
BeginnerMCQMathematical20.8k
A schematic diagram of an elevator cab. A rectangular box representing the cab is centered in the frame. A single vertical solid line representing the supporting cable extends from the center of the top edge of the box straight upward toward a small circular pulley at the top. To the right of the rectangular box, an upward-pointing vertical arrow is labeled v. The mass of the box is indicated by the label m placed inside the box. No other labels, lines, text, or axes appear.
Elevator cab ascending at constant speed.
An elevator cab of mass \(1000\text{ kg}\) is lifted vertically at a constant speed of \(2.0\text{ m/s}\) by a cable connected to an overhead motor. As the cab ascends, a constant retarding frictional force of \(4000\text{ N}\) opposes its motion. What is the instantaneous power delivered by the motor to the cab?

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