Fox And Mcdonald's Introduction To Fluid Mechanics
9th Edition
ISBN: 9781118921876
Author: Pritchard, Philip J.; Leylegian, John C.; Bhaskaran, Rajesh
Publisher: WILEY
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Textbook Question
Chapter 9, Problem 96P
A 180–hp sports car of frontal area 1.72 m2, with a drag coefficient of 0.31, requires 17 hp to cruise at 100 km/h. At what speed does aerodynamic drag first exceed rolling resistance? The rolling resistance is 1.2 percent of the car weight, and the car mass is 1250 kg. Find the drivetrain efficiency. What is the maximum acceleration at 100 km/h? What is the maximum speed? Which redesign will lead to a higher maximum speed: improving the drive train efficiency by 6 percent from its current value, reducing the drag coefficient to 0.29, or reducing the rolling resistance to 0.91 percent of the car weight?
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A sign ABCD is constructed from 5 mm thick plate steel
(density p=8000 kg/m³) with the geometry shown in the
figure. The sign is connected to the wall by a pin at A and
also supported by member BE. Support member BE is also
constructed from 5 mm thick plate steel and is connected by
pins at B and E respectively. Determine the reaction forces
at A and E. Enter your answers in Cartesian components.
The weights of both the sign ABCD and member BE
should be accounted for in the calculation. Assume the pins
cm away from the ends at each
are located a distance
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BY NC SA
2016 Eric Davishahl
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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
2.4 m
b
2.88 m
с
1.2 m
h
1.152 m
ω
7 cm
The reaction at A is A
-1265
The reaction at E is E
3291
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Answers in box are incorrect so need help, please show all work, steps, units and round to 3 significant figures. Thank you!
Compute the coordinates of the centroid (x, y) of the area
shown.
y
y = a√√√bx
X
BY NC SA
2016 Eric Davishahl
Values for dimensions on the figure are given in the following
table. Note the figure may not be to scale.
Variable Value
α
4.5 in
b
1.6 in 1 (Note the -1 exponent only applies to
the unit, not the number.)
с
6 in
The coordinate of the centroid is =
4
☑ in.
The y coordinate of the centroid is y =
11.4
☑ in.
Chapter 9 Solutions
Fox And Mcdonald's Introduction To Fluid Mechanics
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