Borgnakke’s
Fundamentals of Thermodynamics
Global Edition
Solution Manual
Chapter 1
Introduction and Preliminaries
In-Text Concept Questions
1.a
1.b
1.c
1.d
1.e
1.f
1.g
1.h
1.i
Concept-Study Guide Problems
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
1.11
1.13
1.14
1.15
1.16
Properties, Units, and Force
1.17
1.18
1.19
1.20
1.21
1.22
1.23
1.24
1.25
1.26
1.27
The elevator in a hotel has a mass of 750 kg, and it carries six people with a total
mass of 450 kg. One of the people weighs 80 kg standing still. How much
weight does this person feel when the elevator starts moving?
Specific Volume
1.28
1.29
1.30
1.31
1.32
1.33
Pressure
1.34
1.35
1.36
1.37
1.38
1.39
1.40
A piston/cylinder with cross sectional area of 0.01 m2 has a piston mass of 100 kg
resting on the stops, as shown in Fig. P1.40. With an outside atmospheric pressure
of 100 kPa, what should the water pressure be to lift the piston?
1.41
1.42
1.43
1.44
1.45
1.46
A 2.5 m tall steel cylinder has a cross sectional area of 1.5 m2. At the bottom with
a height of 0.5 m is liquid water on top of which is a 1 m high layer of gasoline.
This is shown in Fig. P1.45. The gasoline surface is exposed to atmospheric air at
101 kPa. What is the highest pressure in the water?
1.47
1.48
1.49
1.50
Liquid water with density ρ is filled on top of a thin piston in a cylinder with
cross-sectional area A and total height H, as shown in Fig. P1.50. Air is let in
under the piston so it pushes up, spilling the water over the edge. Derive the
formula for the air pressure as a function of piston elevation from the bottom, h.
Manometers and Barometers
1.51
1.52
1.53
1.54
1.55
1.56
1.57
1.58
1.59
1.60
1.61
1.62
1.63
1.64
1.65
1.66
Energy and Temperature
1.67
1.68
1.69
1.70
1.71
1.72
1.73
Review Problems
1.74
1.75
Two cylinders are connected by a piston as shown in Fig. P1.75. Cylinder A is
used as a hydraulic lift and pumped up to 500 kPa. The piston mass is 25 kg and
there is standard gravity. What is the gas pressure in cylinder B?
1.76
In the city water tower, water is pumped up to a level 25 m above ground in a
pressurized tank with air at 150 kPa over the water surface. This is illustrated in
Fig. P1.76. Assuming the water density is 1000 kg/m3 and standard gravity, find
the pressure required to pump more water in at ground level.
1.77
1.78