EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 19, Problem 48P
(III) Suppose a gas is taken clockwise around the rectangular cycle shown in Fig. 19-32, starting at b, then to a, to d, to c, and returning to b. Using the values given in Problem 39, (a) describe each leg of the process, and then calculate (b) the net work done during the cycle, (c) the total internal energy change during the cycle, and (d) the net heal flow during the cycle, (e) What percentage of the intake heat was turned into usable work: i.e., how efficient is this “rectangular” cycle (give as a percentage)?
FIGURE 19-32
Problems 38, 39, and 40.
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(III) The PV diagram in Fig. 15–23 shows two possible states
of a system containing 1.75 moles of a monatomic ideal
gas. (P = P, = 425 N/m², Vị = 2.00 m³, V, = 8.00 m².)
(a) Draw the process which depicts an isobaric expansion from
state 1 to state 2, and label this process A. (b) Find the work
done by the gas and the change in internal energy of the gas in
process A. (c) Draw the two-step process which depicts an
isothermal expansion from state 1 to the volume V, , followed
by an isovolumetric increase in temperature to state 2, and
label this process B.
(d) Find the change (N/m2)
in internal energy 500
of the gas for the
two-step process B.
+
!
400
2
300
200
100
FIGURE 15-23
+
+
0 2
+
+
8
10 V (m³)
Problem 12.
4
(d) A piston-cylinder device initially contains 0.4 m³ of air at 115 kPa and 90°C.
The air is now compressed to 0.1 m³ remaining at constant temperature.
Assume that the process is quasi-equilibrium.
(i)
Sketch the P-V diagram of the process.
(ii)
Determine the work done during this process.
..48 GO As a gas is held within a
closed chamber, it passes through the
cycle shown in Fig. 18-41. Determine
the energy transferred by the system
as heat during constant-pressure
process CA if the energy added as heat
QAB during constant-volume process
AB is 20.0 J, no energy is transferred
as heat during adiabatic process BC,
and the net work done during the cycle
is 15.0 J.
Pressure
B
A
C
0
Volume
Figure 18-41 Problem 48.
Chapter 19 Solutions
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
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