Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
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Textbook Question
Chapter 2, Problem 2.1P
Are the pressure in the tables absolute or gauge pressure?
Expert Solution & Answer
To determine
Type of pressures in the tables.
Explanation of Solution
In all thermodynamic tables, the pressure is taken as absolute. Absolute pressure is the pressure above atmospheric pressure.
Water has the same chemical composition in all three phases be it water, ice or steam. So, water is a pure substance. The behavior of pure substances depends on absolute pressure.
In the thermodynamic steam table, two steam table is given for water that is saturation steam table and superheated steam tables. In both, the table absolute pressure is given for the ease of calculation.
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Complete solution and Fbd only. I prefer handwritten solution. I will Upvote
The assembly shown consists of a weightless, rigid bar AC, pinned at B, that is attachedto the steel and aluminum rods. Initially, bar AC is in horizontal position; there is agap, Δ = 9 mm, between the lower end of the steel rod and its pin support at D.Neglecting the weight of the rods, compute their stresses when they are subjected to atemperature increase of 35°C and the lower end of the steel rod is attached to itssupport.
answers: σSt = 194.617 MPaσAl = 97.308 MPa
Complete solution and Fbd only. I prefer handwritten solution. I will Upvote
3. Three cables at an ambient temperature of 75°C are connected in series. The assemblyis subjected to a total tension force P = 3.75 kN. The properties of the three cables aregiven in the provided table.a. At 100°C, what is the total elongation of the assembly?b. If the said cables are arranged in a parallel assembly, determine the stress anddeformation of each cable subjected to the same tension force given andtemperature change in (a).
Answers: (a) PSt = 96.019 kN (C) PAl = 170.789 kN (T)(b) σSt = 40.884 MPa σAl = 53.311
Complete solution and Fbd only. I prefer handwritten solution. I will Upvote
A rod is composed of three segments subjected to axial loads as shown. The propertiesof each segment are given in the provided table. Determine the failure stresses of eachmaterial if the whole assembly experienced:a. A total temperature drop of 50°C and sprung 1.2 mm.b. A total temperature rise of 50°C, and assuming it is firmly attached to unyieldingsupports.Assume FS = 1.85.
ANSWERS: (a) σfail St = 356.952 MPa σfail Br = 93.126 MPa σfail Al = 91.615 MPa (b) σfail St = 320.754 MPa σfail Br = 148.912 MPa σfail Al =
Chapter 2 Solutions
Fundamentals Of Thermodynamics
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