Thinking Like an Engineer: An Active Learning Approach (4th Edition)
4th Edition
ISBN: 9780134639673
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 11RQ
The relationship of the power required by a propeller (show as the power number, on the ordinate) and the Reynolds number (abscissa) is shown in the following graph. For a propeller, the Reynolds number (Re) is written slightly differently as
where D is the blade diameter [meters] and n is the shaft speed [hertz]. The power number (Nρ) is given by the following, where P is the power required [watts].
Use the following chart to answer questions (a) through (d).
- a. If the Reynolds number is 500, what is the power number for a system described by curve A?
- b. If the power number (Nρ) is 30, what is the Reynolds number for a system described by curve A?
- c. If the Reynolds number is 4000, what is the power (P) required in units of watts at a shaft speed (n) of 0.03 hertz? Assume the system contains acetone, with a kinematic viscosity of 0.419 stokes. The density of acetone is 0.785 grams per cubic centimeters. Use curve B in the graph to determine your answer. (Hint: Use the Reynolds number of the system to first calculate the diameter, then find the power number, and then calculate the power.)
- d. If the power number (Nρ) is 5, what is the diameter (D) of the blade in units of centimeters at a shaft speed (n) of 0.02 hertz? Assume the system contains brine, with a kinematic viscosity of 0.0102 stokes. Use curve A in the graph to determine your answer. (Hint: Find the Reynolds number of the system first, and then calculate the diameter.)
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A triangular distributed load of max intensity w acts on beam
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Determine the largest load intensity, Wmax, that can be
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BY NC SA
2016 Eric Davishahl
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B
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Values for dimensions on the figure are given in the following
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Variable Value
a
6.6 m
b
11.88 m
C
4.29 m
The maximum load intensity is
=
wmax
N/m.
The reaction at A is A =
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=
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ĴN.
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The beam is supported by a pin at B and a roller at C and is
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2013 Michael Swanbom
CC
BY NC SA
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Values for dimensions on the figure are given in the following
table. Note the figure may not be to scale.
Variable Value
a
3.2 ft
b
6.4 ft
C
3 ft
a.) The reaction at B is B =
The reaction at C is C =
ĵ lb.
i+
Ĵ lb.
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Chapter 13 Solutions
Thinking Like an Engineer: An Active Learning Approach (4th Edition)
Ch. 13.2 - An unknown amount of oxygen, kept in 8 piston-type...Ch. 13.2 - The data shown graphically in the figure describe...Ch. 13.5 - Prob. 3CCCh. 13.5 - Prob. 4CCCh. 13 - Capillary action draws liquid up a narrow tube...Ch. 13 - Several reactions are carried out in a closed...Ch. 13 - An environmental engineer has obtained a bacteria...Ch. 13 - In a turbine a device used for mixing the power...Ch. 13 - Being quite interested in obsolete electronics,...Ch. 13 - Referring to the previous ICA 13-5, Angus is also...
Ch. 13 - Prob. 7ICACh. 13 - The following instructions apply to ICA 13-7 to...Ch. 13 - The following instructions apply to ICA 13-7 to...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - The following instructions will apply to ICA 13-10...Ch. 13 - Prob. 21ICACh. 13 - As a reminder, the Reynolds number is discussed in...Ch. 13 - As a reminder, the Reynolds number is discussed in...Ch. 13 - An environmental engineer has obtained a bacteria...Ch. 13 - An environmental engineer has obtained a bacteria...Ch. 13 - An environmental engineer has obtained a bacteria...Ch. 13 - A growing field of inquiry that poses both great...Ch. 13 - If an object is heated, the temperature of the...Ch. 13 - The Volcanic Explosivity Index (VEI) is based...Ch. 13 - You are an engineer for a plastics manufacturing...Ch. 13 - A Pitot tube is a device used to measure the...Ch. 13 - As part of an electronic music synthesizer you...Ch. 13 - The following data were collected during testing...Ch. 13 - The relationship of the power required by a...Ch. 13 - When a fluid flows around an object, it creates a...
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