Problem 1 A piston cylinder device like the one shown in the figure contains 0.4 kg...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Problem 1 A piston cylinder device like the one shown in the figure contains 0.4 kg of air with an initial volume equal to 0.2 m³. The piston has cross section Ap = 5 · 10−4 m² and mass mp = 7.65 kg. Heat is supplied at a constant rate through the bottom of the cylinder; the lateral wall of the cylinder and the piston are made of a heat resistant material that can be considered a perfect thermal insulator (i.e., no heat transfer across the cylinder walls). The ambient atmospheric pressure surrounding the device is 100 kPa. As a result of applying heat, the internal energy of the gas increases by 22 kJ and the volume expands by 25%. Assume that there is no friction between the piston and the wall, and that the device is well sealed. Please answer the following: a) List the three most important assumptions and approximations that you will need and use to solve all questions below. You do not need to identify all these assumptions immediately. Identify those that you can right now then add more as you work through your analysis. Should this system be analyzed as a control volume (i.e., open system) or a control mass (i.e., closed system) b) c) Draw a diagram of the system that you will use in analyzing this physical process. Your schematic should include a system boundary and show all the different energy transfers via arrows across this boundary. d) e) Determine the initial pressure of the air inside the piston-cylinder device. Represent the initial (1) and final (2) states on a P-V diagram and the process line. Include values and units on each axis (kPa, m³) f) Compute the work done by the air inside the cylinder on the piston during process 1-2, in kJ. g) Determine the final temperature of the air, in °C. h) Evaluate the total heat transferred during the process, in kJ. Patm 100 kPa Air Problem 1 A piston cylinder device like the one shown in the figure contains 0.4 kg of air with an initial volume equal to 0.2 m³. The piston has cross section Ap = 5 · 10−4 m² and mass mp = 7.65 kg. Heat is supplied at a constant rate through the bottom of the cylinder; the lateral wall of the cylinder and the piston are made of a heat resistant material that can be considered a perfect thermal insulator (i.e., no heat transfer across the cylinder walls). The ambient atmospheric pressure surrounding the device is 100 kPa. As a result of applying heat, the internal energy of the gas increases by 22 kJ and the volume expands by 25%. Assume that there is no friction between the piston and the wall, and that the device is well sealed. Please answer the following: a) List the three most important assumptions and approximations that you will need and use to solve all questions below. You do not need to identify all these assumptions immediately. Identify those that you can right now then add more as you work through your analysis. Should this system be analyzed as a control volume (i.e., open system) or a control mass (i.e., closed system) b) c) Draw a diagram of the system that you will use in analyzing this physical process. Your schematic should include a system boundary and show all the different energy transfers via arrows across this boundary. d) e) Determine the initial pressure of the air inside the piston-cylinder device. Represent the initial (1) and final (2) states on a P-V diagram and the process line. Include values and units on each axis (kPa, m³) f) Compute the work done by the air inside the cylinder on the piston during process 1-2, in kJ. g) Determine the final temperature of the air, in °C. h) Evaluate the total heat transferred during the process, in kJ. Patm 100 kPa Air
Expert Answer:
Related Book For
Thermodynamics An Interactive Approach
ISBN: 978-0130351173
1st edition
Authors: Subrata Bhattacharjee
Posted Date:
Students also viewed these mechanical engineering questions
-
Planning is one of the most important management functions in any business. A front office managers first step in planning should involve determine the departments goals. Planning also includes...
-
Managing Scope Changes Case Study Scope changes on a project can occur regardless of how well the project is planned or executed. Scope changes can be the result of something that was omitted during...
-
Desgin a class diagram for Blackboard System. The diagram should also include: Generalization Relationships Association Relationships Aggregation/Composition Relationships Multiplicity please draw 1...
-
A self-tanning lotion advertises that a 3-oz bottle will provide four applications. The Community College thespians need fake tans for a play they are doing. If the play has a cast of 35, how many...
-
The planning department of an electronics firm has set up the activities for developing and production of a new MP3 Player. Given the information below, develop a project network using Microsoft...
-
When analyzing the impact of various combinations of sales price and volume on profit by using a what-if analysis in Excel, which of the following items would be needed? a. Total fixed expenses b....
-
The following inventory transactions apply to Green Company for 2016: The beginning inventory consisted of 180 units at $48 per unit. All transactions are cash transactions. Required a. Record these...
-
1. Find the focal length of a convex mirror of radius of curvature 1m. 2. Focal length of a convex mirror is 50 cm. What is its radius of curvature? 3. Radius of curvature of a concave mirror is 25...
-
What is the benefit to a company from a securities underwriter? They study the market and advise companies on where to set their IPO share price. They help companies to reduce the risk associated...
-
What are some disadvantages to using debt to fund your assets?
-
What is another way of saying this: To confirm the expected time to pay back the initial investment for the Salesforce CRM system, an ROI calculation sheet was utilized to obtain the following...
-
What are some disadvantages to using debt to fund your assets?
-
Use the chart below to answer this question. Assume that this chart represents a market value based index with three stocks. How much did the index move overall based on the changes in stock prices?...
-
Make a reflective goal journal 1. Think about your life before you started Loyalist College, Now and two years from now. How has your life changed? Describe how you have changed as a person. -2. Then...
-
The Poppy Motel is located near Yellowstone National Park. Mr. Poppy is analyzing weekly sales data from the past year. He finds that along with the busy summer season, there are several weeks in the...
-
D Which of the following is considered part of the Controlling activity of managerial accounting? O Choosing to purchase raw materials from one supplier versus another O Choosing the allocation base...
-
Air enters an evaporative cooler at 1 atm, 38oC and 15% relative humidity at a rate of 5 m3/min, and it leaves with a relative humidity of 80%. Determine (a) The exit temperature (T2) of the air, (b)...
-
Ethylene (C2H4) at 25oC and 1 atm is burned with 300% excess air at 25oC and 1 atm. Assuming that this reaction takes place adiabatically at 25oC and that the products leave at 25oC and 1 atm....
-
A closed system operating at steady state receives 5000 kW of heat from a source at 1500 K, produces 2000 kW of useful power and rejects the remaining heat into the atmosphere. Determine the rate at...
-
Does the snowflake have rotational symmetry in Figure 1.6? If yes, describe the ways in which the flake can be rotated without changing its appearance. Does it have reflection symmetry? If yes,...
-
A couple in a sport-utility vehicle (SUV) is traveling at 90 km/h on a straight highway. The driver sees an accident in the distance and slows down to 40 km/h in
-
Which of the following statements are hypotheses? (a) Heavier objects fall to Earth faster than lighter ones. (b) The planet Mars is inhabited by invisible beings that are able to elude any type of...
Study smarter with the SolutionInn App