Applied Fluid Mechanics (7th Edition)
7th Edition
ISBN: 9780132558921
Author: Robert L. Mott, Joseph A. Untener
Publisher: PEARSON
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Textbook Question
Chapter 18, Problem 18.20PP
Compute the specific weight of nitrogen at
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Formula to be used:
Where:
Please take note!
Calculating Pressure in a Static Fluid
or P = pgh or P = yh
p is the fluid's density (kg/m³ or lbm/ft³)
g is the acceleration due to gravity
y is the specific weight of the fluid (N/m³ or lbf/ft³)
W is the weight of the fluid (N or lbf)
A is the area of the bottom of the vessel containing the liquid (m² or ft²)
h is the depth/height of the fluid (m or ft)
P =
P = 1248
h that will be used for the formula may be different from the given height of liquid in a problem. Refer
to the sample problem below for clarification on this matter.
Sample Problem
For the dam shown on the right, find the pressure at point 20 feet below the surface of the water.
Solution:
Here, we will not use h = 40 ft since we are asked to compute
the pressure at point 20 feet below the surface of the water.
So, here is the appropriate approach to this problem.
P = yh
The specific weight of water is 62.4 lbf/ft³.
lbf
P = (62.4 ft3) (20 ft)
lbf
ft²
40 ft
20 ft
Convert 400 N-m/sec to HP
A load of 150 lbs is exerted on a piston confining oil in a circular cylinder with an inside diameter of 2.0 inches. Compute the pressure in the oil at the piston.
Chapter 18 Solutions
Applied Fluid Mechanics (7th Edition)
Ch. 18 - A pipe in a compressed air system is carrying 2650...Ch. 18 - Prob. 18.2PPCh. 18 - Prob. 18.3PPCh. 18 - A duct in a heating system carries 8320 cfm....Ch. 18 - The velocity of flow in a ventilation duct is 1140...Ch. 18 - Prob. 18.6PPCh. 18 - Prob. 18.7PPCh. 18 - Prob. 18.8PPCh. 18 - Prob. 18.9PPCh. 18 - Prob. 18.10PP
Ch. 18 - Prob. 18.11PPCh. 18 - Describe a centrifugal fan with forward-curved...Ch. 18 - Prob. 18.13PPCh. 18 - Prob. 18.14PPCh. 18 - Name four types of positive-displacement...Ch. 18 - Name a type of compressor often used for pneumatic...Ch. 18 - Prob. 18.17PPCh. 18 - Prob. 18.18PPCh. 18 - Prob. 18.19PPCh. 18 - Compute the specific weight of nitrogen at 32...Ch. 18 - Compute the specific weight of air at 1260...Ch. 18 - Prob. 18.22PPCh. 18 - An air compressor delivers 820 cfm of free air....Ch. 18 - Prob. 18.24PPCh. 18 - Prob. 18.25PPCh. 18 - Prob. 18.26PPCh. 18 - Specify a size of Schedule 40 steel pipe suitable...Ch. 18 - For an aeration process, a sewage treatment plant...Ch. 18 - Prob. 18.29PPCh. 18 - Prob. 18.30PPCh. 18 - Prob. 18.31PPCh. 18 - Prob. 18.32PPCh. 18 - Prob. 18.33PPCh. 18 - Prob. 18.34PPCh. 18 - Prob. 18.35PPCh. 18 - Figure 18.14 iD shows a two-compartment vessel....Ch. 18 - Prob. 18.37PPCh. 18 - Prob. 18.38PPCh. 18 - Prob. 18.39PPCh. 18 - A tank of Refrigerant is at 150 kPa gage and 20C....Ch. 18 - Prob. 18.41PP
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