Answer:
The temperature T= 648.07k
Explanation:
T1=input temperature of the first heat engine =1400k
T=output temperature of the first heat engine and input temperature of the second heat engine= unknown
T3=output temperature of the second heat engine=300k
but carnot efficiency of heat engine =
where Th =temperature at which the heat enters the engine
Tl is the  temperature of the environment
since both engines have the same thermal capacities <em> </em> therefore
 </em> therefore 
We have now that
 
 multiplying through by T

 multiplying through by 300
-
The temperature T= 648.07k
 
        
             
        
        
        
Carbonation is more of a healer to the engine
        
                    
             
        
        
        
Answer:
my opinion would be electric 
Explanation:
because when it comes down to the bare minimum the best choice for the world in the long run would be electric because it puts a big dent back for global warming and the burning of gasses so the more people who drive electric cars are the people who are trying to save the world a little at a time by preventing the burning of gasses. hope this helps :)
 
        
                    
             
        
        
        
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