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bezimeni [28]
3 years ago
6

¿Qué sucede con la Energía interna de un sistema cuando sobre él se efectúa trabajo? ¿Qué ocurre con su temperatura?

Physics
1 answer:
disa [49]3 years ago
5 0

Answer:

Disminuye la energía y la temperatura internas.

Explanation:

translation:

it decreases the internal energy and temperature

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» Force is 200,000 Newtons

Explanation:

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Two trains A and B of length 400 m each are moving on two parallel tracks with
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<u>Answer:</u>

<em>The initial distance between the trains is 1450 m. </em>

<u>Explanation:</u>

In the question two trains are of equal length 400 m and moves at a uniform speed of 72 km/h. train A is moving ahead of train B. If the train B has to overtake train A it should accelerate.

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<em>a=1 m/s^2</em>

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<em>initial speed u=72km/h </em>

<em>we have to convert this speed into m/s  </em>

<em>u=72 \times 5/18=20 m/s</em>

<em>Distance covered in accelerating phase  S=ut+1/2  at^2  </em>

<em>=20 \times 50+1/2 \times 1 \times 50^2</em>

<em>=1000+1250=2250 m </em>

If  a train is just behind another, the distance covered by the train located behind during overtaking phase will be equal to the sum of the lengths of the trains.

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<em>Hence the initial distance between the trains = 2250-800=1450 m</em>

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