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Juliette [100K]
3 years ago
11

What is the efficiency of an engine that does 288 J of work and exhausts 72 J of heat while taking in 360 J of heat?

Physics
2 answers:
likoan [24]3 years ago
7 0
If you're using the machine to heat your workshop, it's 20% efficient.

If you're using it to do work, it's 80% efficient.
Darya [45]3 years ago
3 0

Answer:

Efficiency = 80 %      

Explanation:

It is given that,

Work done by the engine, W = 288 J

Heat exhausted by the engine, Q₂ = 72 J

Heat supplied to the engine, Q₁ = 360 J

Efficiency of the heat engine is defined as the ratio of output work to the supplied energy i.e.

\eta=\dfrac{W}{Q_1}

W =  Q₁ - Q₂

So, \eta=1-\dfrac{Q_2}{Q_1}    

\eta=1-\dfrac{72}{360}    

\eta=0.8\times 100

\eta=80\%      

Hence, the correct option is (D) i.e. efficiency = 80 %                                  

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How fast would you be going (in kmh) if you had a ship that accelerated at a constant 1g for 24 hours?
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Answer:

Explanation:

1 g is 9.8 m/s^2 the problem wants the results in km/h so we'll fix that really quick.

9.8 m/s^2 (1 km/1000m)(60 sec/1 min)^2(60 min/1 hour)^2 = 127008 km/hour^2

Now, I'm assuming the ship is starting from rest, and hopefully you know your physics equations.  We are going to use vf = vi + at.  Everything is just given, or we can assume, so I'll just solve.

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A uniform electric field exists in the region between two oppositely charged plane parallel plates. a proton is released from re
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According to Newton's second law

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where

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So, the distance

l = at^2/2 .......(2)

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a = 2l / t^2 ...........(3)

From equations (1) and (3)

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Electric field

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2 years ago
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viktelen [127]
The answer to your question is D
7 0
3 years ago
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On a winter day with a temperature of -10°C, 500g of snow (water ice) is brought inside where the temperature is 18 °C. The snow
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Answer:

Explanation:

Mass of ice m = 500g = .5 kg

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Heat required to melt the ice

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3 years ago
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