1. [Ch1-Definition : 2] The hydraulic lift in an auto-repair shop has a cylinder diameter of...
1. [Ch1-Definition : 2] The hydraulic lift in an auto-repair shop has a cylinder diameter of 0.2 m. To what pressure should the hydraulic fluid be pumped to lift 40 kg of piston and 700 kg of a car?
2. [Ch1-Definition : 3] A barometer to measure absolute pressure shows a mercury column height of 725 mm. The temperature is such that the density of the mercury is 13,550 kg/m3 . Find the ambient pressure (Patm).
3. [Ch2-Property : 3] Air in an automobile tire is initially at −10◦C and 190 kPa. After the automobile is driven awhile, the temperature rises to 10◦C. Find the new pressure: (Assume air is an ideal gas and it is isobaric process)
5. [Ch3-Work-Heat : 4] A gas initially at 1 MPa and 500◦C is contained in a piston/cylinder arrangement with an initial volume of 0.1 m3 . The gas then slowly expands according to the relation PV = constant (polytropic process) until a final pressure of 100 kPa is reached. Determine the work for this process
6. [Ch3-Work-Heat : 4] The heat transfer from a 2-m-diameter sphere to a 25 C air stream over a time interval of one hour is 3000 kJ. Estimate the surface temperature of the sphere if the heat transfer coefficient is 10 W/m2 K. (Note that the surface area of a sphere is 4πr 2 )
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1. [Ch1-Definition : 2] The hydraulic lift in an auto-repair
shop has a cylinder diameter of...
A car on a hydraulic lift rests on a cylinder with a piston with a diameter...
A car on a hydraulic lift rests on a cylinder with a piston with a diameter of 30 cm. If a connecting cylinder is driven by compressed air with a pressure of 65 psi, how big the force approximately will be generated to the piston to lift the car? a. 3,000 lb. b. 4,500 lb. c. 6,000 lb. d. 8,000 lb e. 12,000 lb
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of...
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of stops initially contains 0.35 kg of hellum gas at 100 kPa and 16.8 C. A pressure of 171 kPa is required to lift the piston off the stops. Helium a) At what temperature will the piston begin to move? b) How much heat must be added before the piston starts to rise? c) If the volume of the gas inside the cylinder increases by...
1.Water vapor contained in a piston–cylinder assembly undergoes an isothermal expansion at 277°C from a pressure...
1.Water vapor contained in a piston–cylinder assembly undergoes an isothermal expansion at 277°C from a pressure of 5.1 bar to a pressure of 2.7 bar. Evaluate the work, in kJ/kg. 2.Nitrogen (N2) contained in a piston–cylinder arrangement, initially at 9.3 bar and 437 K, undergoes an expansion to a final temperature of 300 K, during which the pressure–volume relationship is pV1.1 = constant. Assuming the ideal gas model for the N2, determine the heat transfer in kJ/kg. 3.Argon contained in...
Consider a piston-cylinder device (system) that contains 0.06 m3 of air at 300 kPa and 125...
Consider a piston-cylinder device (system) that contains 0.06 m3 of air at 300 kPa and 125 ̊C. (a) If the volume of air in the device increases to 0.15 m3 while the pressure remains constant, determine the work done by the system during the process. (b) If as a result of heat transfer to the surrounding, the pressure and temperature in the device drop to 240 kPa and 55 ̊C, respectively, and the piston is held such that the volume...
Answers are next to the problems. 2. A small, un-insulated closed cylinder with a freely moving...
Answers are next to the problems.
2. A small, un-insulated closed cylinder with a freely moving piston contains air and is accidentally dropped into a lake and falls slowly to the bottom at 100 m below the surface Initially, the air in the cylinder is at atmospheric pressure of 100 kPa with a volume of 0.1 m3 and a temperature of 20°C. The lake is also at a uniform and constant temperature of 20°C. As the cylinder falls, the air...
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is...
Problem 7-173- A piston–cylinder device contains air that undergoes a reversible thermodynamic cycle. Initially, air is at 400 kPa and 300 K with a volume of 0.3 m3. Air is first expanded isothermally to 150 kPa, then compressed adiabatically to the initial pressure, and finally compressed at the constant pressure to the initial state. Accounting for the variation of specific heats with temperature, determine the work and heat transfer for each process.
1. A) Argon contained in a closed, rigid tank, initially at 36.3°C, 2.8 bar, and a...
1. A) Argon contained in a closed, rigid tank, initially at 36.3°C, 2.8 bar, and a volume of 1.4 m3, is heated to a final pressure of 9.9 bar. Assuming the ideal gas model with k = 1.53 for the argon, determine the heat transfer, in kJ. B) Nitrogen (N2) contained in a piston–cylinder arrangement, initially at 6 bar and 435 K, undergoes an expansion to a final temperature of 300 K, during which the pressure–volume relationship is pV1.5 =...
2 kg of water is contained in a piston-cylinder setup. The water is initially at a...
2 kg of water is contained in a piston-cylinder setup. The water is initially at a quality of 0.7 and pressure of 300 kPa. The system is heated until the temperature is 200 °C. During this process, the piston is able to move such that the pressure is maintained at 300 kPa. Find the heat transfer in this process, using units of kJ
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It...
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It is then compressed in a polytropic process PV3 = C to half the original volume. Assuming the ideal gas model for air and specific heat ratio is constant, k=1.4, determine (a) the final temperature, (b) work and heat transfer, each in kJ. R= 0.287 kJ/kg K. W, 82
A piston–cylinder device initially contains 0.6 m3 of saturated water vapor at 250 kPa. At this...
A piston–cylinder device initially contains 0.6 m3 of saturated water vapor at 250 kPa. At this state, the piston is resting on a set of stops, and the mass of the piston is such that a pressure of 300 kPa is required to move it. Heat is now slowly transferred to the steam until the volume becomes 1.5 m3. Use the data from the steam tables. a) Determine the final temperature. b) Determine the work done during this process. c)...
(10 ponts) A piston-cylinder that has a piston initially resting on top of a set of stops initially contains 0.35 kg of hellum gas at 100 kPa and 16.8 C. A pressure of 171 kPa is required to lift the piston off the stops. Helium a) At what temperature will the piston begin to move? b) How much heat must be added before the piston starts to rise? c) If the volume of the gas inside the cylinder increases by...
Answers are next to the problems.
2. A small, un-insulated closed cylinder with a freely moving piston contains air and is accidentally dropped into a lake and falls slowly to the bottom at 100 m below the surface Initially, the air in the cylinder is at atmospheric pressure of 100 kPa with a volume of 0.1 m3 and a temperature of 20°C. The lake is also at a uniform and constant temperature of 20°C. As the cylinder falls, the air...
2 kg of water is contained in a piston-cylinder setup. The water is initially at a quality of 0.7 and pressure of 300 kPa. The system is heated until the temperature is 200 °C. During this process, the piston is able to move such that the pressure is maintained at 300 kPa. Find the heat transfer in this process, using units of kJ
A piston-cylinder assembly initially contains 0.8 kg of air at 100 kPa and 300 K. It is then compressed in a polytropic process PV3 = C to half the original volume. Assuming the ideal gas model for air and specific heat ratio is constant, k=1.4, determine (a) the final temperature, (b) work and heat transfer, each in kJ. R= 0.287 kJ/kg K. W, 82
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