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arsen [322]
3 years ago
5

Why does the frequency of a siren get higher as an ambulance using that siren gets closer?

Physics
2 answers:
Archy [21]3 years ago
7 0
The answer is D. As the ambulance gets closer, the sound waves are compressed relative to the person; so the frequency increases.

yarga [219]3 years ago
7 0
I would say that the answer is D)
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Answer:

\Delta Q=-230kJ

Explanation:

Using the first law of thermodynamics:

\Delta U=\Delta Q-W

Where \Delta U is the change in the internal energy of the system, in this case  \Delta U=250kJ, \Delta Q is the heat tranferred, and W is the work,  W=-480kJ with a negative sign since the work is done by the system.

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\Delta Q=250kJ -480kJ

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The negative sign shows us that the heat is tranferred from the system into the surroundings.

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