Chapter 6: Problem 9
A watt-second is a unit of what quantity? Relate it to a more standard SI unit.
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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Get started for freeA 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.
Give two examples of situations in which you might think you're doing work but in which, in the technical sense, you do no work.
A force pointing in the \(x\) -direction is given by \(F=a x^{3 / 2},\) where \(a=0.75 \mathrm{N} / \mathrm{m}^{3 / 2} .\) Find the work done by this force as it acts on an object moving from \(x=0\) to \(x=14 \mathrm{m}\).
Which of the following is greatest at the peak of the curve? a. the ball's kinetic energy b. the ball's speed c. the rate at which the bat supplies energy to the ball d. the total work the bat has done on the ball
Must you do work to whirl a ball around on the end of a string? Explain.
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