A Carnot engine is set up to produce a certain Work W per cycle. In each cycle, energy in the form of heat QH is transferred to the working substance of the engine from the higher-temperature thermal reservoir, which is at an adjustable temperature TH. The lower-temperature thermal reservoir is maintained at temperature TL = 250 K. Figure gives QH for a range of TH. The scale of the vertical axis is set by QHs = 6.0kJ if TH is set at 550 K, what rsQH?

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QH 250 300 350 TH (K) Qu (kJ)