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Chapter 6: Problem 13
How much work do you do as you exert a \(75-\mathrm{N}\) force to push a shopping cart through a 12 -m-long supermarket aisle?
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An elevator of mass \(m\) rises a vertical distance \(h\) with upward acceleration equal to one-tenth \(g .\) Find an expression for the work the elevator cable does on the elevator.
A watt-second is a unit of what quantity? Relate it to a more standard SI unit.
A tractor tows a plane from its airport gate, doing 8.7 MJ of work. The link from the plane to the tractor makes a \(22^{\circ}\) angle with the plane's motion, and the tension in the link is \(0.41 \mathrm{MN}\). How far does the tractor move the plane?
(a) What power is needed to push a 95 -kg crate at \(0.62 \mathrm{m} / \mathrm{s}\) along a horizontal floor where the coefficient of friction is \(0.78 ?\) (b) How much work is done in pushing the crate \(11 \mathrm{m} ?\)
A truck is moving northward at \(55 \mathrm{mi} / \mathrm{h}\). Later, it's moving eastward at the same speed. Has its kinetic energy changed? Has work been done on the truck? Has a force acted on the truck? Explain.
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