The smoother we make the pulley the more nearly does the amount of useful work which the weight is capable of doing approach ro foot-pounds, and if we take into account the work done against the friction of the pulley, we may say that the work done by the descending weight is ro foot-pounds, and hence when the weight is in its elevated position we have at disposal r o foot-pounds more energy than when it is in the lower position. [Please select]
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Give me back nine pounds, Jane; Ive a use for it. [Please select]
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Give me five pounds, Jane. [Please select]
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Twenty thousand pounds. [Please select]
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The prisoner had on his feet fetters weighing fifty pounds. [Please select]
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"I suppose you make it twenty pounds," said I, smiling. [Please select]
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"Twenty pounds, of course." [Please select]
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