MULTIPLE QUESTIONS, WILL BE CHOOSING BRAINLIEST ! Calculate the acceleration of Kaya riding her bicycle in a straight line that speeds up from 4 m/s to 8 m/s in 4 seconds.

After sitting and then standing still for a second, Louis travels for 8 seconds and his velocity reaches 16m/s. What is his acceleration?

A car advertisement states that a certain
car can accelerate from rest to 70 m/s in
7 seconds. Find the car’s average acceleration.

Which one of these is a unit of acceleration?
A) m/s B) km/hr C) m/s/s

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explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.

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.