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Sagot :
The amount of thermal energy rejected by the coal-fired power plants in the united states is [tex]3.646.10^{12} kWh[/tex].
What is thermal efficiency?
The ratio of the heat produced by a heat engine to the total heat units in the fuel consumed that's what is meant by thermal efficiency .
[tex]nth=\frac{Wcoal}{Qin}\\nth=\frac{Wcoal}{Qout-Wcoal} 23\\Qout=\frac{Wcoal}{nth} -Wcoal[/tex]
[tex]Qout=\frac{Wcoal}{nth} -Wcoal\\Qout=\frac{1.878.10^{12} }{0.34} -1.878.10^{12}\\=3.646.10^{12} kWh[/tex]
Therefore, the amount of thermal energy rejected by the coal-fired power plants in the united states is [tex]3.646.10^{12} kWh[/tex].
To learn more about thermal efficiency from the given link.
https://brainly.com/question/14287776
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