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Furkat [3]
2 years ago
13

BRAINLIEST FOR YOU IF YOU ANSWER

Physics
1 answer:
luda_lava [24]2 years ago
5 0

Answer:

d

Explanation:

i think

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A heat engine operating between energy reservoirs at 20?c and 600?c has 30% of the maximum possible efficiency.
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 <span>The maximum possible efficiency, i.e the efficiency of a Carnot engine , is give by the ratio of the absolute temperatures of hot and cold reservoir. 
η_max = 1 - (T_c/T_h) 

For this engine: 
η_max = 1 - [ (20 +273)K/(600 + 273)K ] = 0.66 = 66% 

The actual efficiency of the engine is 30%, i.e. 
η = 0.3 ∙ 0.664 = 0.20 = 20 % 

On the other hand thermal efficiency is defined as the ratio of work done to the amount of heat absorbed from hot reservoir: 
η = W/Q_h 

So the heat required from hot reservoir is: 
Q_h = W/η = 1000J / 0.20 = 5000J</span>
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3 years ago
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2 years ago
143°C = _____<br><br> 416 K<br> -130 K<br> 0 K<br> 143 K
dezoksy [38]
The answer is 0k because 143c equals nothing
5 0
2 years ago
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What is the velocity of an object that has been in free fall for 1.5s?
Crank

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D. 15 m/s downward

Explanation:

v = at + v₀

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Explanation:

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3 years ago
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