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# A rigid cylindrical tank stores 85.0 kg of a substance at 500 kPa and 455 K while the outside temperature is 300 K. A paddle wheel stirs the system,

A rigid cylindrical tank stores 85.0 kg of a substance at 500 kPa and 455 K while the outside temperature is 300 K. A paddle wheel stirs the system, transferring shaft work (w?sh) at a rate of 0.3 kW . At the same time an internal electrical resistance heater transfers electricity (w?el) at the rate of 1.1 kW .

Part A

Determine Q? necessary to ensure that no net energy enters or leaves the tank.