COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 15, Problem 66QAP
To determine
The required input heat for the engine.
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Students have asked these similar questions
46 Suppose 200 J of work is
done on a system and 70.0 cal
is extracted from the system as
heat. In the sense of the first law
of thermodynamics, what are
the values (including algebraic signs) of (a) W, (b) Q, and (c) AEint?
0
V₁
Volume (m³)
Figure 18-39 Problem 45.
75 Figure 18-54 displays a closed
cycle for a gas. From c to b, 40 J is
transferred from the gas as heat.
From b to a, 130 J is transferred
from the gas as heat, and the mag-
nitude of the work done by the gas
is 80 J. From a to c, 400 J is trans-
ferred to the gas as heat. What is
the work done by the gas from a to
c? (Hint: You need to supply the
plus and minus signs for the given data.)
Figure 18-54 Problem 75.
43 0 Figure 20-32 rep-
resents a Carnot engine
that works between tem-
peratures T, = 400 K and
T2 = 150 K and drives a
Carnot refrigerator that
works between tempera-
tures T3 = 325 K and T =
225 K. What is the ratio
Q3/Qi?
Q2
T4
Chapter 15 Solutions
COLLEGE PHYSICS
Ch. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAPCh. 15 - Prob. 7QAPCh. 15 - Prob. 8QAPCh. 15 - Prob. 9QAPCh. 15 - Prob. 10QAP
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- A thermodynamic system undergoes a process in which its internal energy decreases by 500 J. Over the same time interval, 220 J of work is done on the system. Find the energy transferred from it by heat.arrow_forwardThere is no change in the internal of an ideal gas undergoing an isothermal process since the internal energy depends only on the temperature. Is it therefore correct to say that an isothermal process is the same as an adiabatic process for an ideal gas? Explain your answer. `arrow_forwardGive an example of a spontaneous process in which a system becomes less ordered and energy becomes less available to do work. What happens to the system's entropy in this process?arrow_forward
- In a very mild winter climate, a heat pump has heat transfer from an environment at 5.00C to one at 35.0C. What is the best possible coefficient of performance for these temperatures? Explicitly show how you follow the steps in the Problem-Solving Strategies for Thermodynamics.arrow_forwardWe ordinarily say that U=0 for an isothermal process. Does this assume no phase change takes place? Explain your answer.arrow_forwardA gascooled nuclear reactor operates between hot and cold reservoir temperatures of 700C and 27.0C. (a) What is the maximum eficiency of a heat engine operating between these temperatures? (b) Find the ratio of this eficiency to the Carnot eficiency of a standard nuclear reactor (found in Example 15.4).arrow_forward
- Whyother than the fact that the second law of thermodynamics says reversible engines are the most ef?cientShould heat engines employing reversible processes be more ef?cient than those employing irreversible processes? Consider that dissipative mechanisms are one cause of irreversibility.arrow_forwardA cylinder containing three moles of nitrogen gas is heated at a constant pressure of 2 atm. The temperature of the gas changes from 300 K to 350 K as a result of the expansion. Find work done (a) on gas, and (b) by the gas by using van der Waals equation of state instead of ideal gas law.arrow_forwardIf a gas is compressed isothermally, which of the following statements is true? (a) Energy is transferred into the gas by heat. (b) No work is done on the gas. (c) The temperature of the gas increases, (d) The internal energy of the gas remains constant, (e) None of those statements is true.arrow_forward
- Consider these scenarios and state whether work is done by the system on the environment (SE) or by the environment on the system (ES): (a) opening a carbonated beverage; (b) filling a flat tire; (c) a sealed empty gas can expands on a hot day, bowing out the walls.arrow_forwardA gun is a heat engine. In particular, it is an internal combustion piston engine that does not operate in a cycle, but comes apart during its adiabatic expansion process. A certain gun consists of 1.80 kg of iron. It fires one 2.40 g bullet at 320 m/s Kith an energy efficiency of 1.10%. Assume the body of the gun absorbs all the energy exhaust and increases uniformly in temperature for a short time before it loses any energy by heat into the environment. Find its temperature increase.arrow_forwardIn a cylinder, a sample of an ideal gas with number of moles n undergoes an adiabatic process. (a) Starting with the expression W=PdV and using the condition PV = constant, show that the work done on the gas is W=(11)(PfVfPiVi) (b) Starting with the first law of thermodynamics, show that the work done on the gas is equal to nCV(Tf Ti). (c) Are these two results consistent with each other? Explain.arrow_forward
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