## anonymous one year ago According to Carnot, what does the efficiency of a heat engine depend on? A. the input temperature only B. the exhaust temperature only C. the ratio of input temperature to exhaust temperature D. the ratio of exhaust temperature to input temperature ***not sure! thanks:)

1. Michele_Laino

as I wrote before, the efficiency of a machine of Carnot, is: $\Large \eta = 1 - \frac{{{T_2}}}{{{T_1}}}$ where T_1 is the temperature of the hot reservoir T_2 is the temperature of the cold reservoir

2. anonymous

ohh okay!! so it depends on exhaust energy, right? choice B?

3. Michele_Laino

no, since we have two temperatures

4. anonymous

ohh okay! sorry!! so it should be choice C?

5. Michele_Laino

hint: this quantity: $\Large \frac{{{T_2}}}{{{T_1}}}$ is a ratio

6. anonymous

ohh oops!!! choice d? :O

7. Michele_Laino

yes! option D

8. anonymous

woo!! thanks:)

9. Michele_Laino

thanks!! :)

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