(III) In the process of taking a gas from state a to state c along the curved path shown in Fig. 19–32, 85 J of heat leaves the system and 55 J of work is done on the system. ( a ) Determine the change in internal energy. E int, a – E int, c ( b ) When the gas is taken along the path cda, the work done by the gas is W = 38 J. How much heat Q is added to the gas in the process cda? (c) If P a = 2.2 P d , how much work is done by the gas in the process abc? ( d ) What is Q for path abc? ( e ) If E int, a – E int, b = 15 J, what is Q for the process be? Here is a summary of what is given: Q a → c = − 85 J W a → c = − 55 J W cda = 38 J E int,a − E int,b = 15 J P a = 2.2 P d .
(III) In the process of taking a gas from state a to state c along the curved path shown in Fig. 19–32, 85 J of heat leaves the system and 55 J of work is done on the system. ( a ) Determine the change in internal energy. E int, a – E int, c ( b ) When the gas is taken along the path cda, the work done by the gas is W = 38 J. How much heat Q is added to the gas in the process cda? (c) If P a = 2.2 P d , how much work is done by the gas in the process abc? ( d ) What is Q for path abc? ( e ) If E int, a – E int, b = 15 J, what is Q for the process be? Here is a summary of what is given: Q a → c = − 85 J W a → c = − 55 J W cda = 38 J E int,a − E int,b = 15 J P a = 2.2 P d .
(III) In the process of taking a gas from state a to state c along the curved path shown in Fig. 19–32, 85 J of heat leaves the system and 55 J of work is done on the system. (a) Determine the change in internal energy. Eint, a – Eint, c (b) When the gas is taken along the path cda, the work done by the gas is W = 38 J. How much heat Q is added to the gas in the process cda? (c) If Pa = 2.2Pd, how much work is done by the gas in the process abc? (d) What is Q for path abc? (e) If Eint, a – Eint, b = 15 J, what is Q for the process be? Here is a summary of what is given:
Q
a
→
c
=
−
85
J
W
a
→
c
=
−
55
J
W
cda
=
38
J
E
int,a
−
E
int,b
=
15
J
P
a
=
2.2
P
d
.
(15-56) An inventor claims to have built an engine that produces 2.00 MW of usable work while taking in 3.00 MW of thermal energy at 425 K, and rejecting 1.00 MW of thermal energt at 15 K. Is there anything fishy about his claim?
The engine of an automobile has an intake air of 20°C and compresses it adiabatically up to 10% of its initial volume. Considering the air as an ideal gas, find its final temperature at the end of the compression.
Can improved engineering and materials be employed in heat engines to reduce heat transfer into the environment? Can they eliminate heat transfer into the environment entirely?
Chapter 19 Solutions
Physics for Scientists and Engineers, Vol 1 (Chapters 1-20)
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The Second Law of Thermodynamics: Heat Flow, Entropy, and Microstates; Author: Professor Dave Explains;https://www.youtube.com/watch?v=MrwW4w2nAMc;License: Standard YouTube License, CC-BY