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Chapter 6: Problem 41
It takes about \(20 \mathrm{kJ}\) to melt an ice cube. A typical microwave oven produces 900 W of microwave power. How long will it take a typical microwave to melt the ice cube?
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A certain amount of work is required to stretch spring A a certain distance. Twice as much work is required to stretch spring B half that distance. Compare the spring constants of the two.
Does your car's kinetic energy change if you drive at constant speed for 1 hour?
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?
You slide a box of books at constant speed up a \(30^{\circ}\) ramp, applying a force of \(200 \mathrm{N}\) directed up the slope. The coefficient of sliding friction is \(0.18 .\) (a) How much work have you done when the box has risen 1 m vertically? (b) What's the mass of the box?
A typical human diet is \(* 2000\) calories" per day, where the "calorie" describing food energy is actually 1 kilocalorie. Express 2000 kcal/day in watts.
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