Suppose joule encountered the waterfall at niagara falls., Ask an Expert

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According to a story told by Lord Kelvin, one day when walking down from Chamonix to commence a tour of Mt. Blanc, "whom should I meet walking up (the trail) but (James) Joule, with a long thermometer in his hand, and a carriage with a lady in it not far off. He told me he had been married since we parted from Oxford, and he was going to try for (the measurement of the) elevation of temperature in waterfalls." Suppose Joule encountered the waterfall at Niagara Falls. Calculate the height if the temperature difference between the top and bottom of the waterfall is 0.20° F.

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