yourmumsanoodle
26.09.2019 •
Physics
Carbon dioxide (co2) gas within a piston–cylinder assembly undergoes a process from a state where p1 = 5 lbf/in.2 , v1 = 2.5 ft3 to a state where p2 = 20 lbf/in.2 , v2 = 0.5 ft3 . the relationship between pressure and volume during the process is given by p = 23.75 − 7.5v, where v is in ft3 and p is in lbf/in.2 . determine the work for the process, in btu.
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Ответ:
work 24.31 ft³/in²
Explanation:
The work in thermodynamic processes is given by a relationship between pressure changes and volume differences as follows:
W = -
In this exercise they give the pressure ratio P = 23.75 -7.5 V, so we can evaluate the integral between points two V1 = 2.5 ft3 and V2 = 0.5 ft3
W = - [23.75 V -7.5 V² / 2]
W = - [23.75 (0.5 -2.5) - 7.5 (0.5² - 2.5²) / 2]
W = - [-47.5 + 23.19] BTU
W = 24.31 ft3 / in2 = 24.31 BTU
Note that the work is positive since work is done on the gas to compress it.
Ответ:
Sodium: C) Malleable, soft, and shiny
Silicon: B) Has properties of both metals and nonmetals
Bromine: D) Highly reactive gas
Argon: A) Nonreactive gas
Hope this helps :)