Physics, 13.07.2019 11:00, XAINEE

Any with these? i’ve tried to answer some but i’m really confused.

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Top left: The slope of the line gives the (constant) acceleration of the moving object because the plot describes the velocity of some moving object. It's hard to tell what points the line passes through in the picture you took, but whatever slope/acceleration you find, that value will stay the same regardless of the time.

Top middle: The slope of the line is negative, which means acceleration has a negative sign. And because the line describes velocity over time, the fact that velocity is linear means that acceleration is constant.

Top right: The acceleration is the slope of the tangent line to the parabola at t=10 . You can visually confirm that the slope of this line would be positive. Now, the average velocity between t=10 and t=11 is

$\bar a=\dfrac{v(11)-v(10)}{11-10}\approx16-14=2$

Judging by the plot, $2\,\dfrac{\mathrm m}{\mathrm s^2}$ seems like a pretty reasonable choice among the answers.

Bottom left: The slope of the tangent line at any point on the plot would be negative. Because velocity is non-linear, will not be constant.

Bottom middle: Opposite situation as in [bottom left].

Bottom right: The acceleration can only be negative for , which means $t=2\,\mathrm s$ must be the correct answer.

answered: Guest

Ididn’t pass this test sorry

answered: Guest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

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Any with these? i’ve tried to answer some but i’m really confused.
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