An engine draws energy from a hot reservoir with a temperature of 1250 K and exhausts energy into a cold reservoir with a temperature of 378 K. Over the course of one hour, the engine absorbs 1.42 × 10^5 J from the hot reservoir and exhausts 7.5 × 10^4 J into the cold reservoir.

a. What is the power output of this engine?
b. What is the maximum (Carnot) efficiency of a heat engine running between these two reservoirs?
c. What is the actual efficiency of this engine?

a.

b.

c.

Explanation:

Given:

Now the work done by the engine:

Using energy conservation,

a.

Hence the power output:

b.

c.

now actual efficiency:

magnified images possible images can be real = projected onto a screen

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.