Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Chapter 12.1, Problem 4cT
A syringe is used to remove some water from the left side of the U-tube. The water level on the left side is seen to be lowered, butthe water level on the right does not change.
Consider the following student dialogue:
| Student 1: | “The pressure at point F must now be higher than atmospheric pressure because the water there is being pushed up against the stopper.” |
| Student 2: | “I think that the pressure at point E must be the same as at point A because they are at the same level. These points are both at atmospheric pressure. So the pressure at point F is lower than atmospheric pressure because know that pressure gets less as you go up.” |
| Student 3: | “But water is more dense than air so the pressure at F cannot be less than atmospheric pressure.” |
With which student(s), if any, do you agree?
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A pitot tube (the figure) is used to determine the airspeed of an airplane. It consists of an outer tube with a number of small holes B (four are shown) that allow air into the tube; that tube is connected to one arm of a U-tube. The other arm of the U-tube is connected to hole A at the front end of the device, which points in the direction the plane is headed. At A the air becomes stagnant so that vA = 0. At B, however, the speed of the air presumably equals the airspeed B of the plane.A pitot tube on a high-altitude aircraft measures a differential pressure of 230 Pa. What is the aircraft's airspeed if the density of the air is 0.0320 kg/m3?
A pitot tube (the figure) is used to determine the airspeed of an airplane. It consists of an
outer tube with a number of small holes B (four are shown) that allow air into the tube; that
tube is connected to one arm of a U-tube. The other arm of the U-tube is connected to hole A
at the front end of the device, which points in the direction the plane is headed. At A the air
becomes stagnant so that và = 0. At B, however, the speed of the air presumably equals the
airspeed B of the plane.
A pitot tube on a high-altitude aircraft measures a differential pressure of 240 Pa. What is
the aircraft's airspeed if the density of the air is 0.0330 kg/m³?
Number
Pair-
Hole A
B
B
Units
Liquid
Air
h
CO-3,4,5
SITUATION 4. (Flow in Pipes -
a)
A circular pipe has a diameter of 750 millimeters is flowing full of
water.
Diameter = D
NOTES: For "Manning's Formula"
Velocity V = 1/n x R S
2/3 1/2
d)
WS
O
NOTES:
Manning's Roughness Coef. n = 0.012
Consider pipe is flowing full.
Pipe Invert Slope is S=1.55%
Hydraulic Radius R= D/4
Flow Rate Q = A x V
Figure 1. FLOW IN PIPES
H +D
Note: Volume = 1.0 m³ = 1,000 liters
Calculate its hydraulic radius, R = ? in meters
Calculate the mean velocity V = ? in meters per sec.
Determine the flow rate Q = ? in cubic meters per sec. ?
Determine the flow rate Q = ? in liters per sec. ?
Chapter 12 Solutions
Tutorials in Introductory Physics
Ch. 12.1 - For each layer, draw a free-body diagram in the...Ch. 12.1 - Imagine that a small hole is opened in the...Ch. 12.1 - Prob. 2aTCh. 12.1 - Suppose you wanted to determine the pressure at...Ch. 12.1 - Prob. 2cTCh. 12.1 - Prob. 2dTCh. 12.1 - Draw a freebody diagram for the small voulme of...Ch. 12.1 - Prob. 3bTCh. 12.1 - Use your answer to part B to compare the pressures...Ch. 12.1 - Prob. 3dT
Ch. 12.1 - Consider the following student dialogue: Student...Ch. 12.1 - Prob. 4aTCh. 12.1 - The right end of the tube is now scaled with a...Ch. 12.1 - A syringe is used to remove some water from the...Ch. 12.2 - A cubical block is observed to float in a beaker...Ch. 12.2 - Prob. 1bTCh. 12.2 - Imagine that you were to release the block from...Ch. 12.2 - In general, does the buoyant force on an object...Ch. 12.2 - By how much does the volume reading increase when...Ch. 12.2 - Does the volume of water displaced by a completely...Ch. 12.2 - Consider the following statement made by a...Ch. 12.2 - A rectangular block, A, is released from rest at...Ch. 12.2 - A second block, B,of the same size and shape as A...Ch. 12.2 - A third block, C, of the same size and shape as A...
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