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balu736 [363]
3 years ago
5

At what frequency does the driver of the car hear the ambulance’s siren? The velocity of sound in air is 343 m/s.

Physics
1 answer:
Katarina [22]3 years ago
4 0
956.602hz. 

Sorry for the late answer, just came across this.

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What type of power plant burns material to make electricity?
Alecsey [184]
<h2>Hello!</h2>

The answer is: D. Coal

<h2>Why?</h2>

Coal power plants burn coal in to get steam, the steam flows into a turbine which is coupled to an electrical generator.

Coal power plants work burning high amounts of coal into a boiler, generation a lot of steam under extreme pressures. The steam is obtained when the water is heated by the burning coal, then the steam is cooled, being transformed in liquid water again (due the condensation process) and it's sent back on a cyclical process.

Have a nice day!

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A mountain-climber friend with a mass of 74 kg ponders the idea of attaching a helium-filled balloon to himself to effectively r
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Answer:

V=16.65 m^3

Explanation:

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R=\frac{25}{100}*74kg=18.5kg

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F_b=18.5kg*g

Now the density of the both gases air and helium are different however the volume is the same change offcorss the mass so:

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P_A=1.29 kg/m^3

F_b=F_A-F_H

F_b=m_a*g-m_h*g

m=P/V

18.5kg*g=(1.29kg/m^3-0.179kg/m^3*)V*g

V=\frac{18.5kg}{(1.29-0.179)kg/m^3}

V=16.65 m^3

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3 years ago
If the electric potential at a point in space is zero, then the electric field at that point is:
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E - impossible to determine based on the given information
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