Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 18, Problem 31RQ
An Excel file named DartTosses.xlsx has one worksheet named Darts containing the horizontal and vertical distance from the bull’s-eye of a dart board from 20 different tosses of a dart. A portion of the data is shown below. Write the MATLAB code necessary to determine the darts that were the closest and the farthest from the bull’s-eye. The program should tell the user in the Command Window, using formatted output, the darts that are closest and farthest from the bull’s-eye.
| Dart | X | Y |
| Dart 1 | 4.04 | 0.55 |
| Dart 2 | 2.63 | 0.35 |
| Dart 3 | 1.10 | 2.97 |
| Dart 4 | 4.89 | 5.60 |
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A group of 23 power transistors, dissipating 2 W each, are to be cooled by attaching them to a black-anodized square aluminum plate and mounting the plate on the wall of a room at 30°C. The emissivity of the transistor and the plate surfaces is 0.9. Assuming the heat transfer from the back side of the plate to be negligible and the temperature of the surrounding surfaces to be the same as the air temperature of the room, determine the length of the square plate if the average surface temperature of the plate is not to exceed 50°C. Start the iteration process with an initial guess of the size of the plate as 43 cm.
The properties of air at 1 atm and the film temperature of (Ts + T)/2 = (50 + 30)/2 = 40°C are k = 0.02662 W/m·°C, ν = 1.702 × 10–5 m2 /s, Pr = 0.7255, and β = 0.003195 K–1.
Multiple Choice
0.473 m
0.284 m
0.513 m
0.671 m
A 40-cm-diameter, 127-cm-high cylindrical hot water tank is located in the bathroom of a house maintained at 20°C. The surface
temperature of the tank is measured to be 44°C and its emissivity is 0.4. Taking the surrounding surface temperature to be also 20°C,
determine the rate of heat loss from all surfaces of the tank by natural convection and radiation.
The properties of air at 32°C are k=0.02603 W/m-K, v=1.627 x 10-5 m²/s, Pr = 0.7276, and ẞ = 0.003279 K-1
The rate of heat loss from all surfaces of the tank by natural convection is
The rate of heat loss from all surfaces of the tank by radiation is
W.
W.
A 2.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The
plate surface has an emissivity of 0.73, and its midpoint temperature is 55°C. Determine the heat flux subjected on the plate surface.
Uniform
heat flux
-Plate, € = 0.73
Cool air
5°C
7
TSUIT
Given: The properties of water at Tf,c= 30°C.
k=0.02588 W/m.K,
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The heat flux subjected on the plate surface is
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Chapter 18 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Ch. 18.1 - a. Write an input statement to ask for the users...Ch. 18.1 - Prob. 2CCCh. 18.1 - Prob. 3CCCh. 18.2 - Assume that the variable M is stored in the...Ch. 18.2 - Prob. 5CCCh. 18 - Write a MATLAB statement that results in the input...Ch. 18 - You are writing code that is part of a purchasing...Ch. 18 - Prob. 3ICACh. 18 - Prob. 4ICACh. 18 - Prob. 5ICA
Ch. 18 - Assume that a three-element row vector v already...Ch. 18 - The tiles on the space shuttle are constructed to...Ch. 18 - The specific gravity of acetic acid (vinegar) is...Ch. 18 - Write a MATLAB program that will allow a user to...Ch. 18 - Write a program that will allow the user to type a...Ch. 18 - In order to calculate the pressure in a flask,...Ch. 18 - Write a program that will allow the user to type...Ch. 18 - Write a MATLAB program that will ask users to...Ch. 18 - Write a program that asks a user to enter, one at...Ch. 18 - Joules first law, also known as the Joule effect,...Ch. 18 - Create a proper plot of the following set of...Ch. 18 - Prob. 17ICACh. 18 - You want to create a graph showing the theoretical...Ch. 18 - The decay of a radioactive isotope can be...Ch. 18 - Create a proper plot of the theoretical voltage...Ch. 18 - Plot the following functions as assigned by your...Ch. 18 - Plot the following functions as assigned by your...Ch. 18 - If an object is heated, the temperature of the...Ch. 18 - The resistance of a typical carbon film resistor...Ch. 18 - Today, most traffic lights have a delayed green,...Ch. 18 - Cadmium sulfide (CdS) is a semiconducting material...Ch. 18 - Your supervisor has assigned you the task of...Ch. 18 - Three different diodes were tested: a constant...Ch. 18 - If a hot liquid in a container is left to cool,...Ch. 18 - You are an engineer working for M M / Mars...Ch. 18 - 1. The specific gravity of gold is 19.3. Write a...Ch. 18 - An unmanned X-43A scramjet test vehicle has...Ch. 18 - A rod on the surface of Jupiter's moon Callisto...Ch. 18 - The Eco-Marathon is an annual competition...Ch. 18 - Write a function and program to determine the mass...Ch. 18 - Prob. 6RQCh. 18 - You are part of an engineering firm on contract...Ch. 18 - Prob. 8RQCh. 18 - Prob. 9RQCh. 18 - When one tries to stop a car, both the reaction...Ch. 18 - Prob. 11RQCh. 18 - Prob. 12RQCh. 18 - Prob. 13RQCh. 18 - Prob. 14RQCh. 18 - Prob. 15RQCh. 18 - Prob. 16RQCh. 18 - Prob. 17RQCh. 18 - Prob. 18RQCh. 18 - Prob. 19RQCh. 18 - Prob. 20RQCh. 18 - Prob. 21RQCh. 18 - Prob. 22RQCh. 18 - Prob. 23RQCh. 18 - Prob. 24RQCh. 18 - Prob. 25RQCh. 18 - Prob. 26RQCh. 18 - Prob. 27RQCh. 18 - Prob. 28RQCh. 18 - Download the weekly retail gasoline and diesel...Ch. 18 - A sample of the data provided in the Microsoft...Ch. 18 - An Excel file named DartTosses.xlsx has one...
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- Hot water is flowing at an average velocity of 5.82 ft/s through a cast iron pipe (k=30 Btu/h-ft-°F) whose inner and outer diameters are 1.0 in and 1.2 in, respectively. The pipe passes through a 50-ft-long section of a basement whose temperature is 60°F. The emissivity of the outer surface of the pipe is 0.5, and the walls of the basement are also at about 60°F. If the inlet temperature of the water is 150°F and the heat transfer coefficient on the inner surface of the pipe is 30 Btu/h-ft².°F, determine the temperature drop of water as it passes through the basement. Evaluate air properties at a film temperature of 105°C and 1 atm pressure. The properties of air at 1 atm and the film temperature of (Ts+ T∞)/2 = (150+60)/2 = 105°F are k=0.01541 Btu/h-ft-°F. v=0.1838 × 10-3 ft2/s, Pr = 0.7253, and ẞ = 0.00177R-1arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forward
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