EBK MINDTAP FOR HERMAN'S UNDERSTANDING
4th Edition
ISBN: 9781337798761
Author: Herman
Publisher: VST
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Textbook Question
Chapter 19, Problem 7RQ
What is the maximum range at which most capacitive proximity detectors can be used to sense an object?
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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 19 Solutions
EBK MINDTAP FOR HERMAN'S UNDERSTANDING
Ch. 19 - What is the function of a proximity detector?
Ch. 19 - What is the basic principle of operation used with...Ch. 19 - What is an oscillator?Ch. 19 - What is the basic operating principle of operation...Ch. 19 - What type of electric circuit is used to increase...Ch. 19 - Name two types of proximity detectors used to...Ch. 19 - What is the maximum range at which most capacitive...Ch. 19 - How is it possible for an ultrasonic proximity...
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