DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 26, Problem 3RQ
Explain how a toaster could be made a closed-loop device.
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A prototype automobile is designed to travel at 65 km/hr. A model of this design is tested in a wind tunnel with identical standard sea-
level air properties at a 1:5 scale. The measured model drag is 529 N, enforcing dynamic similarity. Determine (a) the drag force on the
prototype and (b) the power required to overcome this drag. See the equation
Vm
m
=
D
V Dm
(a) Dp = i
(b) Pp = i
N
hp
A new blimp will move at 6 m/s in 20°C air, and we want to predict the drag force. Using a 1: 14-scale model in water at 20°C and
measuring a 2500-N drag force on the model, determine (a) the required water velocity, (b) the drag on the prototype blimp and, (c) the
power that will be required to propel it through the air.
(a) Vm = i
(b) Dp = i
(c) Pp = i
m/s
N
W
Drag measurements were taken for a sphere, with a diameter of 5 cm, moving at 3.7 m/s in water at 20°C. The resulting drag on the
sphere was 10 N. For a balloon with 1-m diameter rising in air with standard temperature and pressure, determine (a) the velocity if
Reynolds number similarity is enforced and (b) the drag force if the drag coefficient in the equation below is the dependent pi term.
li ε pVI
D
1
= CD = Q
μ
(a) Vp = i
(b) Dp = i
m/s
N
Chapter 26 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 26 - What human attribute is replaced by a CNC machine?Ch. 26 - Give an everyday example of a household device or...Ch. 26 - Explain how a toaster could be made a closed-loop...Ch. 26 - Prob. 4RQCh. 26 - Prob. 5RQCh. 26 - Prob. 6RQCh. 26 - What kind of operations on a milling machine...Ch. 26 - How is a machining center different from a milling...Ch. 26 - Prob. 9RQCh. 26 - Many manufacturers have purchased large machining...
Ch. 26 - Why was it necessary for machine tool builders to...Ch. 26 - Prob. 12RQCh. 26 - Prob. 13RQCh. 26 - Some of the functions performed by the operator in...Ch. 26 - Prob. 15RQCh. 26 - Prob. 16RQCh. 26 - Prob. 17RQCh. 26 - Prob. 18RQCh. 26 - Prob. 19RQCh. 26 - Prob. 20RQCh. 26 - Prob. 21RQCh. 26 - What is an encoder?Ch. 26 - What does a post processor do?Ch. 26 - What is a peck-drilling subroutine for a CNC...Ch. 26 - What is pocket milling, and what kind of milling...Ch. 26 - How are touch probes used in CNC machines to...Ch. 26 - What are G words used for in CNC?Ch. 26 - What major structural changes are introduced into...Ch. 26 - What process steps are eliminated by the UHSMC in...Ch. 26 - Draw a large circle and imagine you are (the tool)...Ch. 26 - Prob. 1P
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