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termo4 4) A mass of 15kg of air in a piston-cylinder device is heated from 25 to 77C by passing current through a resistance heater

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4) A mass of 15kg of air in a piston-cylinder device is heated from 25 to 77C by passing current through a resistance heater inside the cylinder. The pressure inside the cylinder is held constant at 300kPa during the process, and a heat loss of 60kJ occurs. Determine the electric energy supplied, in kWh

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