Thermodynamics: An Engineering Approach
9th Edition
ISBN: 9781260048766
Author: CENGEL
Publisher: MCG
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Textbook Question
Chapter 1.11, Problem 99RP
The force generated by a spring is given by F = kx, where k is the spring constant and x is the deflection of the spring. The spring of Fig. 1–99 has a spring constant of 8 kN/cm. The pressures are P1 = 5000 kPa, P2 = 10,000 kPa, and P3 = 1000 kPa. If the piston diameters are D1 = 8 cm and D2 = 3 cm, how far will the spring be deflected? Answer: 1.72 cm
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1-108 A pressure cooker cooks a lot faster than an ordinary
pan by maintaining a higher pressure and temperature inside.
The lid of a pressure cooker is well sealed, and steam can
escape only through an opening in the middle of the lid. A
separate metal piece, the petcock, sits on top of this opening
and prevents steam from escaping until the pressure force
overcomes the weight of the petcock. The periodic escape of
the steam in this manner prevents any potentially dangerous
pressure buildup and keeps the pressure inside at a constant
value. Determine the mass of the petcock of a pressure
cooker whose operation pressure is 100 kPa gage and has an
opening cross-sectional area of 4 mm². Assume an atmo-
spheric pressure of 101 kPa, and draw the free-body diagram
of the petcock. Answer: 40.8 g
Patm = 101 kPa
by air, and the
eter as shown in
air in the tank if
PRESSURE
COOKER
Petcock
-A = 4 mm²
1-99 The force generated by a spring is given by F=kx, where
k is the spring constant and x is the deflection of the spring.
The spring of Fig. Pl–99 has a spring constant of 8 kN/cm.
The pressures are P, = 5000 kPa, P, = 10,000 kPa, and
P = 1000 kPa. If the piston diameters are D, = 8 cm and
D, = 3 cm, how far will the spring be deflected? Answer: 1.72 cm
%3D
D2
P2
Spring -
P3
P1
DI
1
-
2
3
The rectangle above is a control volume. Flow 1 is 2.7 slugs/sec while
flow 2 is 8.4 slugs/sec. The fluid has density 1.3 slugs/ft³.
Determine the volumetric flow rate of flow 3 in ft³/sec.
Answer with a positive number if the flow is out of the control volume
and a negative number if the flow is into the control volume.
Your answer should include at least one digit after the decimal place.
Hint: Use continuity
Chapter 1 Solutions
Thermodynamics: An Engineering Approach
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