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 91P
Calculate the drag forces on a 1/200 scale model of the Willis Tower that is tested in a large water flume under conditions corresponding to those in problem 9.89. Ignore any free surface effects and assume dynamic similarity and that the drag coefficient is unchanged.
The Willis Tower (formerly the Sears Tower) in Chicago is 1454 ft tall. Assuming that it is a tall rectangle with a square base of 120 ft sides, calculate the maximum drag force on the building and the force when the wind is along the diagonal of the structure as a function of wind speed from Beaufort Wind Scales of strong breeze (28 mph) to hurricane (75 mph). Assuming that the wind field is uniform, calculate the moment about the base of the Tower also.
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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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Variable Value
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2.4 m
b
2.88 m
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1.2 m
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1.152 m
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7 cm
The reaction at A is A
-1265
The reaction at E is E
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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
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The y coordinate of the centroid is y =
11.4
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Chapter 9 Solutions
Fox And Mcdonald's Introduction To Fluid Mechanics
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