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## Homework Statement

A 112 hp car engine operates at 11% efficiency. Assume the engine's water temperature of 85°C is its cold-temperature (exhaust) reservoir and 445°C is its thermal "intake" temperature (the temperature of the exploding gas-air mixture).

(a) What is the ratio of its efficiency relative to its maximum possible (Carnot) efficiency?

*e*actual /

*e*Carnot =

(b) Calculate how much power (in watts) goes into moving the car.

(c) Calculate how much heat, in joules and in kcal, is exhausted to the air in 1.0 h

## Homework Equations

For a) e

_{ideal}=1-(T

_{L}/T

_{H})

For b) (hp)(W)

For c) I need help

## The Attempt at a Solution

I got the answers for a and b.

a).22

b)83552

I have no clue how to do c. I need some guidance.

Thanks!