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2-20
2-54E The systolic and diastolic pressures of a healthy person are given in mmHg. These pressures are to be expressed in
kPa, psi, and meter water column.
2-22
2-57 Water is poured into the U-tube from one arm and oil from the other arm. The water column height in one arm and the
ratio of the heights of the two fluids in the other arm are given. The height of each fluid in that arm is to be determined.
2-58 A double-fluid manometer attached to an air pipe is considered. The specific gravity of one fluid is known, and the
specific gravity of the other fluid is to be determined.
2-24
2-60 Fresh and seawater flowing in parallel horizontal pipelines are connected to each other by a double U-tube manometer.
2-61 The pressure indicated by a manometer is to be determined.
2-27
Review Problems
2-65 A hydraulic lift is used to lift a weight. The diameter of the
piston on which the weight to be placed is to be determined.
2-66E The efficiency of a refrigerator increases by 3% per C rise in the minimum temperature. This increase is to be
expressed per F, K, and R rise in the minimum temperature.
2-67E Hyperthermia of 5C is considered fatal. This fatal level temperature change of body temperature is to be expressed
in F, K, and R.
Weight
2500 kg
2-29
2-71E An expression for the equivalent wind chill temperature is given in English units. It is to be converted to SI units.
2-72E Problem 2-71E is reconsidered. The equivalent wind-chill temperatures in °F as a function of wind velocity in
the range of 4 mph to 40 mph for the ambient temperatures of 20, 40, and 60°F are to be plotted, and the results are to be
discussed.
The table is for Tambient=60°F
0 5 10 15 20 25 30 35 40
-20
-10
V [mph]
2-30
2-73 A vertical piston-cylinder device contains a gas. Some weights are to be placed on the piston to increase the gas
pressure. The local atmospheric pressure and the mass of the weights that will double the pressure of the gas are to be
determined.
2-74 One section of the duct of an air-conditioning system is laid underwater. The upward force the water will exert on the
duct is to be determined.
2-33
2-78 A balloon is filled with helium gas. The maximum amount of load the balloon can carry is to be determined.
2-79 A 6-m high cylindrical container is filled with equal volumes of water and oil. The pressure difference between the top
and the bottom of the container is to be determined.
N/m 1000
2
kPa 54.4
2-34
2-80 The pressure of a gas contained in a vertical piston-cylinder device is measured to be 180 kPa. The mass of the piston
is to be determined.
2-81 The gage pressure in a pressure cooker is maintained constant at 100 kPa by a petcock. The mass of the petcock is to
kg 0.0408
kPa 1
m/s 9.81
2
g
2-82 A glass tube open to the atmosphere is attached to a water pipe, and the pressure at the bottom of the tube is measured.
It is to be determined how high the water will rise in the tube.
2-35
2-83E Equal volumes of water and oil are poured into a U-tube from different arms, and the oil side is pressurized until the
contact surface of the two fluids moves to the bottom and the liquid levels in both arms become the same. The excess
pressure applied on the oil side is to be determined.
2-84 A barometer is used to measure the altitude of a plane relative to the ground. The barometric readings at the ground
and in the plane are given. The altitude of the plane is to be determined.
2-37
2-86 A gasoline line is connected to a pressure gage through a double-U manometer. For a given reading of the pressure
gage, the gage pressure of the gasoline line is to be determined.
Pgage = 370 kPa
