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Chapter 6: Problem 9
A watt-second is a unit of what quantity? Relate it to a more standard SI unit.
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E. coli bacteria swim by means of flagella that rotate about 100 so times per second. A typical \(E .\) coli bacterium swims at \(22 \mu \mathrm{m} / \mathrm{s}\) its flagella exerting a force of \(0.57 \mathrm{pN}\) to overcome the resistance due to its liquid environment. (a) What's the bacterium's power output? (b) How much work would it do in traversing the \(25-\mathrm{mm}\) width of a microscope slide?
You're asked to assess the reliability of a nuclear power plant, as measured by the capacity factor-the ratio of the energy it actually produces to what it could produce if it operated all the time. The plant is rated at \(840 \mathrm{MW}\) of electrical power output, and in a full year it produces \(6.8 \times 10^{9} \mathrm{kW} \cdot\) h of electrical energy. What's its capacity factor?
Is it possible for you to do work on an object without changing the object's kinetic energy? Explain.
A crane lifts a 650 -kg beam vertically upward 23 m and then swings it eastward \(18 \mathrm{m}\). How much work does the crane do? Neglect friction, and assume the beam moves with constant speed.
A pendulum bob swings back and forth on the end of a string, describing a circular arc. Does the tension force in the string do any work?
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