Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 12.1, Problem 3cT
Use your answer to part B to compare the pressures at points T and U. (Hint: How is the pressure at point T related to the force on the small volume of water by the water to its left?)
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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 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
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?
Solve the problems below.
1. A wind blows at the speec. of 30 m/s across a 175 m2 flat roof of a house.
(a) Whar is the pressure difference between the inside of the house and the
outside of the house just above the roof? (Assume that the air pressure
inside the house is atmospheric pressure.)
(b) Whar is the force on the roof due to the pressure difference?
2. Water e:nters a house frorm a ground pipe with an inside dianmeter of 0.02
m at an absolute pressure of 4.0 x 105 Pa. A pipe that is 0.01 m in diameter
leads to the second-floor bathroom 5.0m above the ground floor. The flow
speed ar the ground pipe :s 1.5 m/s. Find the following:
(a) flow speed on the second floor; and
(b) pressure.
3. Water flows at a rate of 800 cm3/min in a pipe of varying cross-sectional
areas. Calculate the veloc.ty of the water at the section where:
(a) the radius is 3.0 cm; and
(b) the radius is 5.0 cm
2021/3/20 21:08
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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