At a steam power plant, steam engines work in pairs, the heat output of the first one being the approximate heat input of the second. the operating temperatures of the first are 740∘c and 440 ∘c, and of the second 415 ∘c and 270 ∘c.
part a
if the heat of combustion of coal is 2.8×107j/kg, at what rate must coal be burned if the plant is to put out 950 mw of power? assume the efficiency of the engines is 65% of the ideal (carnot) efficiency.
express your answer using two significant figures.
part b
water is used to cool the power plant. if the water temperature is allowed to increase by no more than 4.5∘c, estimate how much water must pass through the plant per hour.
express your answer using two significant figures.

depends on what you mean by "group." for order, it would be coleoptera (beetles). for class, it would be insecta (insects). for phylum, it would be the arthropoda (animals with jointed exoskeletons).

explanation:

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.

the right answer is 0.3 meters per second