How are eras different from decades?
1 answer:
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Answer:
A) Not possible, B) Posible, C) Possible, D) Not possible.
Explanation:
The maximum theoretical efficiency for any thermal engine is defined by Carnot's cycle, whose energy efficiency (), no unit, is expressed below:
(1)
Where:
- Cold reservoir temperature, in Kelvin.
- Hot reservoir temperature, in Kelvin.
If we know that and
, then the maximum theoretical efficiency for the thermal engine is:
For real thermal engines, the following inequation is observed:
(2)
Where is the efficiency of the real heat engine, no unit.
There are two possible criteria to determine if a given heat engine is real:
Efficiency
(3)
Where:
- Heat rejected to the cold reservoir, in kilojoules.
- Heat received from the hot reservoir, in kilojoules.
Power output
(4)
Where is the power output, in kilojoules.
Now we proceed to verify each case:
A) ,
,
This engine is not possible.
B) ,
,
The engine is possible.
C) ,
,
The engine is possible.
D) ,
,
The engine is possible.