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emmainna [20.7K]
3 years ago
14

Fossils found in layers of sediment give us clues to Earth's past. Based on the fossil record of this area, we can assume that t

his area was A) once a desert. B) once underwater. C) much colder in the past. D) located in a different place on Earth.
Chemistry
2 answers:
Shalnov [3]3 years ago
8 0

Answer:

its b

Explanation:

i took the test

inessss [21]3 years ago
6 0

Answer:

The answer is B, Once underwater

Explanation:

I took the test

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An ideal reversible heat pump is taking heat from the outside air at -14.0°c and discharging it into the house at 20.0°c. what i
just olya [345]

the coefficient of performance of this heat pump is 8.61.

<h3>What is Heat pump ?</h3>

The air source heat pump converts heat from the ambient air into a low-temperature liquid refrigerant. The pump compresses the liquid to raise its temperature using power. To release the heat it had been holding, it then condenses back into a liquid. Your underfloor heating system or radiators get heat.

coefficient of performance -The usable heating or cooling delivered to work (energy) needed ratio, also known as the coefficient of performance, or COP, of a heat pump, refrigerator, or air conditioning system. Higher efficiency, less energy (power) usage, and thus reduced operational costs are all related to higher COPs.

temperature of cold reservoir = -14.0°C

Tc = [ 273+ (-14.0)]K = 259K

temperature of hot reservoir = 20°C

Th = [ 273+ (20)]K = 293K

therefor, formula for coefficient of performance

Cop = Th/Th-Tc

Cop = 293/34

Cop = 8.61

to learn more about heat pump go to - brainly.com/question/3150928

#SPJ4

4 0
2 years ago
Which model best represents an element?
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c. gold marbles because they have one type of atom


an element is a substance that is entirely made from one type of atom.
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