Answer:
The engine's efficiency is 80%.
Explanation:
Given that,
Heat [tex]Q_{in}=75000\ J[/tex]
Remove heat [tex]Q_{out}=15000\ J[/tex]
We need to calculate the engine's efficiency
The efficiency is equal to the difference Input energy and output energy and divided by the input energy.
Using formula of efficiency
[tex]\eta=\dfrac{Q_{in}-Q_{out}}{Q_{in}}[/tex]
[tex]\eta=\dfrac{75000-15000}{75000}[/tex]
[tex]\eta\times100=80\%[/tex]
Hence, The engine's efficiency is 80%.
