A gas in a piston-cylinder assembly undergoes a process during which the pressure-specific volume is related as PV’ 3 = Constant. The mass of the gas is 0.5 Ibm; the Initial pressure is 170 psia, volume is 1.2 ft3. The final pressure is 420 psia. There is a heat transfer from the gas of 4.1 Btu during the process. Kinetic and potential energy changes are negligible. (Hint: Watch “Closed System-EB-Polytropic process”)
(i) Sketch a P-V diagram showing the process.
(ii) Determine the volume at the final pressure.
(iii) Determine the work done by the system
(iv) Determine the change in specific internal energy, in Btu/Ibm.
Category: Physics
“Closed System-EB-Volume Change”
Air is contained in a vertical piston-cylinder assembly by a piston with a 4-in diameter and a weight of 300 lb,. The atmospheric pressure is 14.7 psia on top of the piston. A total of 4.13 Btu of energy as heat is transferred to the air and the piston rises at constant pressure resulting in a change in volume of 1000 in3. Kinetic and potential energy effects as well as friction between the piston and cylinder wall can be ignored. Determine the change in internal energy, in Btu. (Hint: Watch “Closed System-EB-Volume Change”).
The heat transfer coefficient
The outer surface of the grill hood shown in the figure below is at 47°C and the emissivity is 0.93. The heat transfer coefficient for convection between the hood and the surroundings at 27°C is 10 W/m2K. Determine the net rate of heat transfer between the grill hood and the surroundings by convection and radiation, in kW per m2 of surface area. (Hint: Watch “convection and radiation”)
Linear pressure-volume process
Dr. Sigman discovers a new gas and wants to test in a piston-cylinder assembly. Two process paths are considered between the same end states, 1 and 2, where at state 1 the pressure is 10 bar, the volume is 0.1 m3, the internal energy is 400 kJ, and at state 2 the pressure is 1 bar, the volume is 1.0 m3, and the internal energy is 200 kJ. Ignore Kinetic and potential energy effects. Process A: Path from 1 to 2 during which the pressure-volume relation is PV = constant. Process B: Constant volume process from state 1 to an intermediate pressure of 2 bar, followed by a linear pressure-volume process to state 2. For each of the processes determine changes in the heat transfer from the gas in kJ. (Hint: Watch “Closed System-EB Comparison”).
Relationship between pressure and volume
Air undergoes a process from an initial state 14.7 psia and 1000 in3 to a final state where 60 psia, and 320 in3. The relationship between pressure and volume during the process is pV” = constant. Determine the value of the constant n and calculate the work, in Btu. (Hint: watch “work determination”).
The work for the process in Btu
Carbon dioxide gas within a piston-cylinder assembly undergoes a process from an initial state of 5 psia, and 2.5 ft3 to a state of 20 psia, and 0.5 ft3. The path taken is indicated by the relationship P = 24 — 8V, where V is in ft3 and P is in psia. Determine the work for the process, in Btu. (Hint: Watch “Work Calculation”)
The mass of the piston
Air is contained in a vertical piston-cylinder assembly. The atmosphere exerts a pressure of 14.7 psi on top of the 9-in-diameter piston. The absolute pressure of the air inside the cylinder is 16 psi. Determine the mass of the piston, in Ibm and gage pressure. The local acceleration of gravity D 40mm is 32.2 Ws’. (hint: Watch “pressure examples”) ,C77,„,„1 65 mm il
Atomic Bombs
Create an engaging 3-paragraph paper that ties Atomic and Nuclear Physics (Atomic Bombs) concepts to the real world. The paragraphs should address the following points:
• Paragraph 1: Describe the physics concepts/topic: Atomic Bombs. Include a reference, **see attachment**, on the topic, terminology with definitions, units, conventions, etc.
• Paragraph 2: Summarize one or more impacts of the physics concepts on everyday life or aviation.
• Paragraph 3: Either: (i) provide a real example, e.g., from an article or documented report of the aviation impact of this physics concept, or (ii) give “your take” on the relevance and importance of this topic from your own perspective, by providing personal points of view or related experiences.
• Length. No set minimum word requirement. However, confine the paper to 500 words.
• Graphics. Include a graphic or image within your post, including but not limited to using the attached images.
Sandwich Generation
The Sandwich Generation refers to individuals who are being pulled by the needs of their children and parents. Although their children may be getting older,
they still “need” their parents. In addition, their parents are getting older and now need to rely on them as well.
1. Watch this:
https://www.youtube.com/watch?v=WDqYbKr9Y8g
2. Talk to someone you know who is a part of this sandwich generation about their experience. Describe the issues facing the Sandwich Generation and how
we can support them. Are there pros and cons of being “sandwiched”? Does culture factor into this discussion?
Physics
Now that you have a broader understanding of some basic concepts from the world of Physics, create a new hypothetical experiment from your own life experience that helps explain one of the concepts. Think in simple terms, and explain what you expect your experiment to uncover. For your response, provide an alternative experiment to your classmates’ post.