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Work transfers energy to a system through the forceful manipulation of its state. Do some work on yourself to master this fundamental mode of energy transfer.
What is the minimum amount of work in Joules that a 60 kg man must do in order to climb up a tree house that is 3 meters high?
Details and assumptions
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A man who is standing on a ladder vertically lifts a book of mass \(3\text{ kg}\) with a rope at a constant speed. If the change in the book's height is \(7\text{ m},\) how much work did the man do on the book?
The gravitational acceleration is \(10\text{ m/s}^2.\)
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A weight lifter is bench-pressing a barbell whose weight is \(650\text{ N}.\) He raises the barbell vertically by \(0.60\text{ m}\) above his chest with a constant velocity. How much work did the weight lifter do on the barbell?
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A box with mass \(100\text{ kg}\) is on the flatbed of a truck which is moving with an acceleration of \(a=1.5\text{m/s}^2\) along the positive \(x\)-axis. The box does not slip with respect to the truck. If the displacement of the truck is \(s=35\text{ m},\) what is the total work done on the box by all of the forces acting on it?
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A man is pulling a sled on a icy road. The total mass of the sled is \(50.0\text{ kg},\) and the man exerts a force of magnitude \(1.20 \times 10^2\text{ N}\) on the sled by pulling on a rope. At a distance of \(13.5\text{ m}\) from the starting point, the man releases the rope, and the sled stops at a distance of \(18.2\text{ m}\) from the starting point. If the friction force between the ice and the sled is \(45.0\text{ N},\) how much work did the friction force do on the sled?
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