A closed, rigid tank fitted with a paddle wheel contains 1.8 kg of air, initially at...

 

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A closed, rigid tank fitted with a paddle wheel contains 1.8 kg of air, initially at 200°C, 1 bar. During an interval of 20 minutes, the paddle wheel transfers energy to the air at a rate of 1 kW. During this time interval, the air also receives energy by heat transfer at a rate of 0.5 kW. These are the only energy transfers. Assume the ideal gas model for the air, and no overall changes in kinetic or potential energy. Do not assume specific heats are constant. Determine the change in specific internal energy for the air, in kJ/kg, and the final temperature of the air, in °C. Step 1 Determine the change in specific internal energy for the air, in kJ/kg. Au Save for Later kJ/kg Attempts: 0 of 3 used Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above. Submit Answer A closed, rigid tank fitted with a paddle wheel contains 1.8 kg of air, initially at 200°C, 1 bar. During an interval of 20 minutes, the paddle wheel transfers energy to the air at a rate of 1 kW. During this time interval, the air also receives energy by heat transfer at a rate of 0.5 kW. These are the only energy transfers. Assume the ideal gas model for the air, and no overall changes in kinetic or potential energy. Do not assume specific heats are constant. Determine the change in specific internal energy for the air, in kJ/kg, and the final temperature of the air, in °C. Step 1 Determine the change in specific internal energy for the air, in kJ/kg. Au Save for Later kJ/kg Attempts: 0 of 3 used Step 2 The parts of this question must be completed in order. This part will be available when you complete the part above. Submit Answer