contestada

If a gasoline engine has an efficiency of 21 percent and losses 780 J to the cooling system and exhaust during each cycle, how much work is done by the engine?

Respuesta :

As we know that efficiency of engine is given as

[tex] efficiency = \frac{W}{Q_i}[/tex]

also we know that

[tex]Q_i - Q_o = W[/tex]

given that

[tex]Q_o = 780 J[/tex]

efficiency = 21%

now we have

[tex]0.21 = \frac{Q_i - Q_o}{Q_i}[/tex]

[tex]0.21 Q_i = Q_i - 780[/tex]

[tex]0.79Q_i = 780[/tex]

[tex]Q_i =987.3J[/tex]

now we have

[tex]W = 987.3 - 780 = 207.3 J[/tex]

d271108

Answer:

207.3 J

Explanation:

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