A horizontal, frictionless piston has an initial pressure of 200 kPa of air. It is held...
A horizontal, frictionless piston has an initial pressure of 200 kPa of air. It is held in place by a catch. 50 kJ of heat is transferred to the piston, and then catch is released, which results in an isobaric piston expansion of 1.5 m. The piston head has a cross sectional area of 1.4 m2.
- How much work is done by the piston (and in which direction)?
- What is the internal energy change of the air in the piston?
Homework Answers
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A horizontal, frictionless piston has an initial pressure of 200
kPa of air. It is held...
This question is about work and pressure A frictionless piston cylinder contains a gas at a...
This question is about work and pressure A frictionless piston cylinder contains a gas at a pressure of 200 kPa. The cross-sectional area of the piston is 0.04 m². Heat transfers to the gas, and as a result, the piston and load are raised through a distance (*) of 0.4 m. Assume the atmospheric air pressure to be 100 kPa. (Hint: this process is isobaric) 0 Is this an open system or a closed system and why? [2 marks] (I)...
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QUESTION 24 A piston-cylinder device contains 50 kg of water at 250 kPa and 25 degree...
QUESTION 24
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A gas is contained in a vertical, frictionless piston-cylinder device. The piston has a mass of...
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2. A piston-cylinder device maintain a constant pressure of 800 kPa while containing 20 kg of...
2. A piston-cylinder device maintain a constant pressure of 800 kPa while containing 20 kg of saturated water vapor. The system is heated with a resistance heater for 10 min at a current of 8 A at the standard wall voltage of 120 V. In that time, 3.2 kJ of heat is lost through the walls. What is the temperature at the heated state? 3 5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft. At...
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* A gas is contained in a vertical, frictionless piston-cylinder device. The piston has a mass...
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This question is about work and pressure A frictionless piston cylinder contains a gas at a pressure of 200 kPa. The cross-sectional area of the piston is 0.04 m². Heat transfers to the gas, and as a result, the piston and load are raised through a distance (*) of 0.4 m. Assume the atmospheric air pressure to be 100 kPa. (Hint: this process is isobaric) 0 Is this an open system or a closed system and why? [2 marks] (I)...
QUESTION 24
A piston-cylinder device contains 50 kg of water at 250 kPa and 25 degree C. The cross-sectional area of the piston is 0.1 m2. Heat is now transferred to the water, causing part of it to evaporate and expand. When the volume reaches 0.2 m3 the piston reaches a linear spring whose spring constant is 100 kN/m. More heat is transferred to the water until the piston rises 20 cm more. Determine (a) the final pressure and temperature...
A spring loaded piston-cylinder device with a cross sectional area of 0.2 m2 contains 0.6 kg of air, as shown in the figure. The air initially at 100 kPa and 20°C, is heated to 450 kPa at which the piston begins to move. The process continues until the final volume is 12 times the initial volume. Calculate (a) the final temperature in kb) the work done in kJ. (the total heat transfer in this process Use the following properties for...
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A closed cylinder of 0.25 m diameter is fitted with a light frictionless piston The piston is retained in position by a catch in the cylinder wall and the volume on one side of the piston force of 120 N on the Example 2.5 contains air at pressure of 750 kN/m2. The volume on the other side of piston is ev spring is mounted coaxially with the cylinder in this evacuated space to give a piston in this position. The...
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