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kotykmax [81]
3 years ago
9

What is the change in internal energy if 60 J of heat are released from a

Physics
1 answer:
lana [24]3 years ago
7 0

Answer:

60 J of heat are released from the system: Q=-60 J

20 J of work is done on the system: W=-20 J

∆U=Q-W

∆U=-60-(-20)

∆U=-40 J

Explanation:

If the heat is released from the system, Q should be negative.

If the heat is gained by the system, Q should be positive.

If the work is done on the system, W should be negative.

If the work is done by the system, W should be positive.

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hammer [34]

Answer:

The car's displacement during this time is 25.65 meters.

Explanation:

Given that,

Final velocity of the car, v = 4.5 m/s

Deceleration of the car, a=-2.7\ m/s^2

Let u is the initial speed of the car. It is given by :

v=u+at

u=v-at

u=4.5-(-2.7)\times 3

u = 12.6 m/s

Let d is the car's displacement during this time. It can be calculated using second equation of motion as :

d=ut+\dfrac{1}{2}at^2

d=12.6\times 3+\dfrac{1}{2}\times (-2.7)\times 3^2

d = 25.65 meters

So, the car's displacement during this time is 25.65 meters. Hence, this is the required solution.                        

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3 years ago
There are clouds forming over Florida. The temperatures in the clouds and in the air are above freezing. Which form of precipita
PtichkaEL [24]

The type of precipitation expected to occur in Florida is "Rain" when the temperatures of air and clouds are above freezing point.

<u>Explanation:</u>

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Explanation:

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3 years ago
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The cats have full bowls in the morning and afternoon, Katy can assume that the cats do not eat in the morning or afternoon. The bowls are replenished in the evening, which suggests that they become empty in the evening, which suggest that the pattern is that the cats eat in the evening so your answer would be C. Hope this helps. ;)
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3 years ago
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gogolik [260]
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Hope this helps!</span>
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3 years ago
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