Course Name: Fluid Mechanics
Course Number: CIV 242
Instructor: Dr. Mohamed Elhakeem
Due Date: 1-week after solution
_______________________________________________________________________
Homework-1
1. If the specific gravity of your body is 0.95, determine your body volume.
2. A 2.5 cm wide space between two horizontal plane surfaces is filled with an oil of
viscosity of 0.03 Ns/m
2
. What force is required to move a very thin plate of an
area of 0.4 m
2
through the oil at a velocity of 0.1 m/s if: 1) the plate is 1.0 cm
away from the lower plane surface; 2) the plate is 1.25 cm away from the lower
plane surface?
3. What is the surface tension of mercury if the
observed depression of the mercury in a 7 mm
diameter tube was 1.0 mm? The specific gravity and
wetting angle of mercury is 13.6 and135
o
,
respectively.
4. Two vessels are connected to a differential
manometer using mercury (S.G. 13.56), the
connecting tubing being filled with water (see figure
beside). The higher-pressure vessel is 1.5 m lower in
elevation than the other. Room temperature prevails.
If the mercury reading is 100 mm, what is the
pressure difference in m of water, and in kPa? (b) If
carbon tetrachioride (S.G. = 1.59) were used instead
of mercury, what would the manometer reading be
for the same pressure difference?
5. What is the height of water y if the vacuum pressure
of the air inside the tube is 10kPa (see the figure
beside).
Course Name:
Fluid Mechanics
Course Number:
CIV 242
Instructor:
Dr. Mohamed Elhakeem
Due Date:
1-week after solution
_______________________________________________________________________
Homework-1
1. If the specific gravity of your body is 0.95, determine your body volume.
2. A 2.5 cm wide space between two horizontal plane surfaces is filled with an oil of
viscosity of 0.03 Ns/m2. What force is required to move a very thin plate of an
area of 0.4 m2 through the oil at a velocity of 0.1 m/s if: 1) the plate is 1.0 cm
away from the lower plane surface; 2) the plate is 1.25 cm away from the lower
plane surface?
3. What is the surface tension of mercury if the
observed depression of the mercury in a 7 mm
diameter tube was 1.0 mm? The specific gravity and
wetting angle of mercury is 13.6 and135 o,
respectively.
4.
Two vessels are connected to a differential
manometer using mercury (S.G. 13.56), the
connecting tubing being filled with water (see figure
beside). The higher-pressure vessel is 1.5 m lower in
elevation than the other. Room temperature prevails.
If the mercury reading is 100 mm, what is the
pressure difference in m of water, and in kPa? (b) If
carbon tetrachioride (S.G. = 1.59) were used instead
of mercury, what would the manometer reading be
for the same pressure difference?
5. What is the height of water y if the vacuum pressure
of the air inside the tube is 10kPa (see the figure
beside).
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Nuraini Abdul Aziz
UPM - Universiti Putra Malaysia
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Mahmoud Farag
American University in Cairo
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Isad Saric
University of Sarajevo
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Mikail F Lumentut
National Taiwan University
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