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3 years ago

Which of the following best describes a plane?

Physics

2 answers:

katrin [286]3 years ago

4 0

B, the surface of a flat table.

DerKrebs [107]3 years ago

3 0

Yes B, The surface of a flat table

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A point source at the origin emits sound of frequency 175 Hz uniformly in all directions. On the x-axis at x=100 m, the sound in

hammer [34]

Answer:

Multiple answers:

1. Power output P=17.59W

2.Intensity 160m I=17.6W/ $m^{2}$

3. dB = 77.3

4. f=178.5 Hz

Explanation:

First one comes from the expression

$I=\frac{P}{4\pi r^{2} }$

where I is the intensity, P is the power and r is the radio of the spherical wave, or in this case, the distance x. I solved for the Power by multiplying Intensity with the area (4 $\pi x^{2}$

Second one is done with:

$\frac{I_{2} }{I_{1} } =\frac{x^{2}_{1} }{x^{2} _{2}}$

Solving for Intensity 2, the result mentioned.

The third is simply computed with

$dB=10*log\frac{I}{10^{-12} }$

And finally the last one is done with doppler effect, taking into account the speed of the air as in 10ºC 337m/s.

$f=f_{initial} *(\frac{s+v_{receiver} }{s+v_{source} } )$

Where Finitial is the frequency emitted and s is the speed of the sound. The wind blowing in positive is, in principle, going away of the observer.

8 0

3 years ago

How did rutherford's experiment show that thomson's plum pudding model was incorrect?

Aleksandr [31]

He said that the atom is mostly empty space with a positive nucleus in the center with electrons around it.

5 0

3 years ago

A sailboat took 25 hours to cover 1/4 of a journey. Then, it

ozzi

Answer:

Explanation:

4 0

3 years ago

A large rock is weathered into tiny pieces which add up the weight of the original rock this demonstrates the conversion of ____

stich3 [128]

When a large rock is weathered into tiny pieces which add up the weight of the original rock, this demonstrates the law of conservation of matter.

According to this law the mass of an object doesn't change with time and also it does not depends on how the particles are arranged themselves.

Hence, option (C) is correct.

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3 years ago

Cognitive psychology deals with ____.

Elanso [62]

Answer:

Explanation:

Because the main focus of cognitive psychology is on the metal processes that affect behavior

3 0

2 years ago