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To make ice, a freezer that is a reverse Carnot engine extracts 38 kJ as heat at -10°C during each cycle, with coefficient of performance 6.0. The room temperature is 33.9°C. How much:
(a) energy per cycle is delivered as heat to the room and
(b) work per cycle is required to run the freezer?
Give your answers in kJ.
A car accelerates from 17 m s1to 31 m s-1 with a uniform acceleration of 2.5 m s-2. Calculate the displacement of the car during the acceleration.
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How to find out potential energy
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