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3 years ago

Explain why solar energy is considered an inexhaustible source of energy

1 answer:

6 0

-- The amount of energy radiated by the sun is not affected at all by how much
of it we use or don't use.

-- The sun is not expected to quit shining on us, or to change its rate of energy
output, at any time within the next several many human lifetimes.

Solar energy is going to keep arriving here, continuously, at the same rate,
free of charge, for a long long time, whether we feel like using it or not. It's
the closest thing to manna from heaven that has been seen around here for
thousands of years.

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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

Glaciers store about 72% of the world's freshwater false are true

IRISSAK [1]

The answer to this question is True.

6 0

3 years ago

If you are pushing on a box with a force of 20 N and there is a force of 7 N on the box due to sliding friction, what is the net

DIA [1.3K]

I think you would do 20+7 = 27N as the net force

7 0

3 years ago

Read 2 more answers

A common way to measure the distance to lightning is to start counting, one count per second, as soon as you see the flash. Stop

AURORKA [14]

Answer:

d = 1.07 mile

Explanation:

The rationale for this method is that the speed of light is much greater than the speed of sound, the definition of speed in uniform motion is

v = d / t

d = v t

the speed of sound is worth

v = 343 m / s

Therefore, the speed of sound must be multiplied by time to do this, all the units must be in the same system, as the distance in miles is requested

v = 343 m/s (1mile/1609 m) (3600s/1 h) = 343 (2.24) = 767.4 mile/h

v = 343 m / s (1 mile / 1609 m) = 0.213, mile/ s

If the measured time is t = 5s we multiply it by the speed

we substitute

d = 0.213 5

d = 1.07 mile

If you want to calculate the speed, this method in general is not widely used, since you must know the distance where the lightning occurred, which is relatively complicated.

8 0

3 years ago

Why would ships or trains be a better choice than airplanes for moving wheat

pashok25 [27]

Because in the outcome your making a profit because the transportation would be cheaper for your company

8 0

3 years ago