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gulaghasi [49]
3 years ago
12

Which one of the following is a correct statement......

Physics
1 answer:
IceJOKER [234]3 years ago
5 0

Answer:

Just 3

Explanation:

I believe the other two are incorrect

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4 years ago
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In a certain time interval, natural gas with energy content of 19000 J was piped into a house during a winter day. In the same t
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Answer:

The amount of heat transfer is 21,000J .

Explanation:

The equation form of thermodynamics is,

ΔQ=ΔU+W

Here, ΔQ is the heat transferred, ΔU is the change in internal energy, and W is the work done.

Substitute 0 J for W and 0 J for ΔU

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The change in internal energy is equal to zero because the temperature changes of the house didn’t change. The work done is zero because the volume did not change

The heat transfer is,

ΔQ=Q  (in ) −Q (out )

Substitute 19000 J + 2000 J for Q(in)  and 0 J for Q(out)

ΔQ=(19000J+2000J)−(0J)

=21,000J

​Thus, the amount of heat transfer is 21,000J .

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3 years ago
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4. Magnets with one pole are now routinely made.<br> True or False
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Answer:

False

Explanation:

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Tom Sawyer runs 10 m/s down the dock and leaps on to his floating raft already moving 1.5 m/s away from shore. If Tom weighs 70
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Answer:

Not the right answer in the options, speed is 4.47 m/s, and the procedure is coherent with option A

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Answer A uses mass and velocity units, which are momentum units. By using the conservation of momentum:

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Since Tom stays in the raft, then both are moving with the same speed. From the options, the momentum is in agreement with option A, however, the question asks for speed.

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