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15. A hot metal bar with cooling constant k = 2.1min is submerged in a large tank of water held at temperature 7, - 10C.

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15. A hot metal bar with cooling constant k = 2.1min" is submerged in a large tank of water held at temperature 7, - 10"C. Let y() be the bar's temperature at time * (in minutes). a) Find the differential equation satisfied by y() and find its universal solution. b) What is the bar's temperature after 1min if its initial temperature was 180" C

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