Q: Is the boundary work associated with constant-volume systems always zero
Is the boundary work associated with constant-volume systems always zero?
See AnswerQ: 1 m3 of saturated liquid water at 200°C is expanded
1 m3 of saturated liquid water at 200°C is expanded isothermally in a closed system until its quality is 80 percent. Determine the total work produced by this expansion, in kJ.
See AnswerQ: Saturated water vapor at 200°C is condensed to a saturated
Saturated water vapor at 200°C is condensed to a saturated liquid at 50°C in a spring-loaded piston–cylinder device. Determine the heat transfer for this process in kJ/kg.
See AnswerQ: A piston–cylinder device contains helium gas initially at 100 kPa
A piston–cylinder device contains helium gas initially at 100 kPa, 10°C, and 0.2 m3. The helium is now compressed in a polytropic process (PVn = constant) to 700 kPa and 2...
See AnswerQ: A frictionless piston–cylinder device initially contains air at 100 kPa
A frictionless piston–cylinder device initially contains air at 100 kPa and 0.15 m3. At this state, a linear spring (F ∠x) is touching the piston but exerts no for...
See AnswerQ: The drag force exerted on a car by air depends on a
The drag force exerted on a car by air depends on a dimensionless drag coefficient, the density of air, the car velocity, and the frontal area of the car. That is, FD = FD ( Cdrag, Afront, Ï...
See AnswerQ: A frictionless piston–cylinder device and a rigid tank initially contain
A frictionless piston–cylinder device and a rigid tank initially contain 12 kg of an ideal gas each at the same temperature, pressure, and volume. We wish to raise the temperatures of both systems by...
See AnswerQ: An insulated piston–cylinder device initially contains 0.01 m3
An insulated piston–cylinder device initially contains 0.01 m3 of saturated liquid–vapor mixture with a quality of 0.2 at 120°C. Now some ice at 0°C is added to the cylinder. If the cylinder contains...
See AnswerQ: A passive solar house that is losing heat to the outdoors at
A passive solar house that is losing heat to the outdoors at an average rate of 50,000 kJ/h is maintained at 22°C at all times during a winter night for 10 h. The house is to be heated by 5...
See AnswerQ: Water is boiled at sea level in a coffeemaker equipped with an
Water is boiled at sea level in a coffeemaker equipped with an immersion-type electric heating element. The coffee maker contains 1 L of water when full. Once boiling starts, it is observed that half...
See Answer
