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Chap18
1. Test Bank, Question 2
When two gases separated by a diathermal wall are in thermal equilibrium with each other:
only their pressure must be the same
only their volumes must be the same
they must have the same number of particles
they must have the same pressure and the same volume
only their temperatures must be the same
2. Test Bank, Question 5
The zeroth law of thermodynamics allows us to define
work
pressure
temperature
thermal equilibrium
internal energy
3. Test Bank, Question 12
When a certain constant volume gas thermometer is in thermal contact with water at its triple point (273.16 K) the
pressure is 6.30 × 104 Pa. For this thermometer a kelvin corresponds to a change in pressure of about:
4.34 × 102 Pa
2.31 × 102 Pa
1.72 × 103 Pa
2.31 × 103 Pa
1.72 × 107 Pa
4. *Chapter 18, Problem 3
A gas thermometer is constructed of two gas-containing bulbs, each in a water bath, as shown in Figure 18-29. The
pressure difference between the two bulbs is measured by a mercury manometer as shown. Appropriate reservoirs, not
shown in the diagram, maintain constant gas volume in the two bulbs. There is no difference in pressure when both
baths are at the triple point of water. The pressure difference is 106 torr when one bath is at the triple point and the
other is at the boiling point of water. It is 80.0 torr when one bath is at the triple point and the other is at an unknown
temperature to be measured. What is the unknown temperature (in Kelvin)?
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Print Assignment: Chap18 ::
Number
348.631698113208
Units K
Significant digits are disabled; the tolerance is +/-2%
5. *Chapter 18, Problem 7
Suppose that on a linear temperature scale X, water boils at -39.1°X and freezes at -211°X. What is a temperature of
233 K on the X scale? (Approximate water's boiling point as 373 K.)
Number
-279.76
Units °X
Significant digits are disabled; the tolerance is +/-2%
6. *Chapter 18, Problem 14
When the temperature of a copper coin is raised by 150 C°, its diameter increases by 0.26%. To two significant figures,
give the percent increase in (a) the area of a face, (b) the thickness, (c) the volume, and (d) the mass of the coin. (e)
Calculate the coefficient of linear expansion of the coin.
(a) Number
0.52
Units percent
(b) Number
0.26
Units percent
(c) Number
0.78
Units percent
(d) Number
0
(e) Number
0.000017333333
Units percent
Units /C° or (C°)^-1
7. *Chapter 18, Problem 21
As a result of a temperature rise of 36 C°, a bar with a crack at its center buckles upward (Fig. 18-31). If the fixed
distance L0 is 3.49 m and the coefficient of linear expansion of the bar is 25.0 × 10-6/C°, find the rise x of the center.
Number
0.074034079990
Units m
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Print Assignment: Chap18 ::
Significant digits are disabled; the tolerance is +/-2%
8. Test Bank, Question 37
Heat is:
energy transferred by virtue of a temperature difference
energy transferred by macroscopic work
energy content of an object
a temperature difference
a property objects have by virtue of their temperatures
9. *Chapter 18, Problem 32
The specific heat of a substance varies with temperature according to c = 0.12 + 0.92T + 0.084T2, with T in °C and c in
cal/g·K. Find the energy required to raise the temperature of 8.9 g of this substance from 0.020°C to 15°C.
Number
1778.1970004064
Units cal
Significant digits are disabled; the tolerance is +/-2%
10. *Chapter 18, Problem 39
Ethyl alcohol has a boiling point of 78.0 ˚C, a freezing point of -114 ˚C, a heat of vaporization of 879 kJ/kg, a heat of
fusion of 109 kJ/kg, and a specific heat of 2.43 kJ/kg•K. How much energy must be removed from 0.635 kg of ethyl
alcohol that is initially a gas at 78.0 ˚C so that it becomes a solid at -114 ˚C?
Number
923645.6
Units J
Significant digits are disabled; the tolerance is +/-2%
11. Test Bank, Question 64
According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process:
equals the heat input minus the work done on the gas
equals the heat input plus the work done on the gas
equals the work done on the gas minus the heat input
is independent of the heat input
is independent of the work done on the gas
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12. Test Bank, Question 65
Pressure vs. volume graphs for a certain gas undergoing five different cyclic processes are shown below. During which
cycle does the gas do the greatest positive work?
III
IV
I
II
V
13. Test Bank, Question 66
In an adiabatic process:
the energy absorbed as heat equals the work done by the system on its environment
the energy absorbed as heat equals the work done by the environment on the system
the energy absorbed as heat equals the change in internal energy
the work done by the environment on the system equals the change in internal energy
the work done by the system on its environment equals to the change in internal energy
14. Test Bank, Question 82
On a very cold day, a child puts his tongue against a fence post. It is much more likely that his tongue will stick to a
steel post than to a wooden post. This is because:
steel has a higher specific heat
steel is a better radiator of heat
steel has a higher specific gravity
steel is a better heat conductor
steel is a highly magnetic material
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15. *Chapter 18, Problem 47
When a system is taken from state i to state f along path iaf in Fig. 18-39, Q = 50.6 cal and W = 20.4 cal. Along path
ibf, Q = 37.0 cal. (a) What is W along path ibf? (b) If W = -13.3 cal for the return path fi, what is Q for this path? (c) If
Eint,i = 10.0 cal, what is Eint, f? If Eint,b = 22.9 cal, what is Q for (d) path ib and (e) path bf ?
Give your answers in calories.
(a) Number
6.8
(b) Number
-43.5
(c) Number
40.2
Units cal
Units cal
Units cal
(d) Number
19.7
Units cal
(e) Number
17.3
Units cal
16. *Chapter 18, Problem 81
A sample of gas undergoes a transition from an initial state a to a final state b by three different paths (processes), as
shown in the p-V diagram in Fig. 18-56, where Vb = 5Vi. The energy transferred to the gas as heat in process 1 is
13piVi. In terms of piVi, what are (a) the energy transferred to the gas as heat in process 2 and (b) the change in
internal energy that the gas undergoes in process 3?
Give your answers as multiples of the value of piVi.
(a)
16
(b)
9
17. *Chapter 18, Problem 58
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Print Assignment: Chap18 ::
A solid cylinder of radius r1 = 2.5 cm, length h1 = 4.6 cm, emissivity 0.71, and temperature 38°C is suspended in an
environment of temperature 54°C. (a) What is the cylinder's net thermal radiation transfer rate P1? (b) If the cylinder is
stretched until its radius is r2 = 0.52 cm, its net thermal radiation transfer rate becomes P2. What is the ratio P2/P1?
(a) Number
(b)
0.934716540016
Units W
3.130076706392
18. *Chapter 18, Problem 60
Figure 18-45 shows the cross section of a wall made of three layers. The thicknesses of the layers are L1, L2 =0.750 L1,
and L3 = 0.300 L1. The thermal conductivities are k1, k2 = 0.880 k1, and k3 = 0.780 k1. The temperatures at the left and
right sides of the wall are TH = 28 ˚C and TC = -15 ˚C, respectively. Thermal conduction is steady.
(a) What is the temperature difference ΔT2 across layer 2 (between the left and right sides of the layer, in C˚)?
If k2 were, instead, equal to 1.080 k1,
(b) would the rate at which energy is conducted through the wall be greater than, less than, or the same as previously,
and
(c) what would be the value of ΔT2 (in C˚)?
(a) ΔT2 =
16.383352872216
C
(b) greater than
(c) ΔT2 =
14.362795477903
C
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