The answer would be <span>72 kg'm/s b</span>ecuase the wall is pushing off 9 becuase it took 5 and bounced back off 4 so
9 times 8= 72 kg m/s
Answer:
D. I'm guessing
The gold-foil experiment showed that the atom consists of a small, massive, positively charged nucleus with the negatively charged electrons being at a great distance from the centre.
Let the rod be on the x-axes with endpoints -L/2 and L/2 and uniform charge density lambda (2.6nC/0.4m = 7.25 nC/m).
The point then lies on the y-axes at d = 0.03 m.
from symmetry, the field at that point will be ascending along the y-axes.
A charge element at position x on the rod has distance sqrt(x^2 + d^2) to the point.
Also, from the geometry, the component in the y-direction is d/sqrt(x^2+d^2) times the field strength.
All in all, the infinitesimal field strength from the charge between x and x+dx is:
dE = k lambda dx * 1/(x^2+d^2) * d/sqrt(x^2+d^2)
Therefore, upon integration,
E = k lambda d INTEGRAL{dx / (x^2 + d^2)^(3/2) } where x goes from -L/2 to L/2.
This gives:
E = k lambda L / (d sqrt((L/2)^2 + d^2) )
But lambda L = Q, the total charge on the rod, so
E = k Q / ( d * sqrt((L/2)^2 + d^2) )
The star is moving toward the earth.
It is due to the phenomenon of the Doppler shift.
The <u>Doppler effect</u>, commonly referred to as "Doppler shift," is the <u>change in the wavelength </u>or frequency of waves as a result of an observer's motion in relation to the wave source.
It is possible to see this<u> apparent wavelength </u>change in the visible light emitted by stars and galaxies.
As a result, a star moving toward Earth appears to emit light with a shorter <u>wavelength</u> than a light source that is stationary. It is known as blueshift because <u>shorter wavelengths</u> cause the spectrum to shift toward the <u>blue end</u>.
While a star traveling away from us appears to shift its light towards longer wavelengths. Astronomers refer to this as redshift since it is closer to the <u>red end of the spectrum.</u>
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As the spectrum of a particular star shows the hydrogen line appearing at a shorter wavelength of 480 nm in comparison to the laboratory measurements, that show the same hydrogen lines at a greater wavelength of 500 nanometers, that’s why we conclude that the star is moving toward earth.
Learn more about Doppler shift here brainly.com/question/23841569
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Answer:
heliocentric is when the earth and the other planets revolves around the sun.
Explanation:
I'm not sure about which one but I do know what heliocentric is.