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Drupady [299]
4 years ago
5

A heat engine operates between 200 K and 100 K. In each cycle it takes 100 J from the hot reservoir, loses 25 J to the cold rese

rvoir, and does 75 J of work. This heat engine violates the second law but not the first law of thermodynamics. Why is this true?
Physics
1 answer:
Elena-2011 [213]4 years ago
6 0

Answer:

It does not violate the first law because the total energy taken is what is used 100J = 25J + 75J

But violates 2nd lawbecause the engine has a higher energy after doing work than the initial for e.g A cold object in contact with a hot one never gets colder, transferring heat to the hot object and making it hotter confirming the second law

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Use the terms "force", "weight", "mass", and "inertia" to explain why it is easier to tackle a 220 lb football player than a 288
Tomtit [17]
<span><u>Answer </u>
The mass of 220 lb football has less than 288 lb football. So, it will be easier to move it since it will require less force. The heavy football will have a bigger momentum. Since 288 lb has more weight than 220 lb, it will have bigger inertia making it difficult for the players to stop it.
This makes it easier to tackle 220 lb football than 288 lb football. 
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7 0
4 years ago
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3 years ago
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Anna71 [15]

Answer:

height is 45 metres

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¹/²v² = gh

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5 0
4 years ago
Two cars are traveling along perpendicular roads, car A at 40 mi/hr, car B at 60 mi/hr. At noon, when car A reaches the intersec
Serggg [28]

Answer:

\frac{dD}{dt} = -4 miles/hour

negative sign indicates that the distance is decreasing with time

Explanation:

Let at any time t after noon that is 12 p.m.  

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distance traveled by car B = 90-60t

then distance between the two cars at time t

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also, at time 1 p.m.

distance D^2= (40\times1)^2+(90-60\times1)^2

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2\times50\frac{dD}{dt}= 3200\times1-3600\times1

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3 0
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butalik [34]
Well, basically because the observations can help you out during the experiment.
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4 years ago
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