The pressure exerted by the block on the table is given by:
where W is the weight of the box, and A is the bottom surface area of the box.
The weight of the box is:
Substituting into the first equation, we find the pressure:
To produce work a gas is expanded adiabatically from 3 MPa and 300oC to 80 kPa in a piston-cylinder device. Which of these two c
hoices –air with an isentropic expansion efficiency of 90% or neon with an isentropic expansion efficiency of 80% – will produce the most work?
1 answer:
Answer:
Explanation:
Check attachment for solution
Given that, .
The initial gas pressure is
P1 = 3 MPa
The initial gas temperature
T1 = 300°C
The final gas pressure is
P2 = 80 KPa
Which are of two choices
1. Air with an isentropic expansion of 90% efficiency
2. Neon with an isentropic expansion of 80% efficiency
We want to know which will produce more work
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