Physics, 18.11.2019 18:31 kedjenpierrelouis

The velocity of a car traveling in a straight line increases from 0 meters/second to 30 meters/second in 8 seconds. what is the average acceleration of the car?

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Answer from: Welcomes

Average acceleration is how much the car increases (on average) per second. So, since it increases by 30 m/s in 8 s, then dividing 30 by 8 will give you an average acceleration of 3.75 m/s^2 (remember that acceleration is ever increasing, so the unit is s^2, not just s)

Hope this helps!

Answer from: 20alondra04

Answer : $a=3.75\ m/s^2$

Explanation :

Initial velocity of the car, u = 0 m/s

Final velocity of the car, v = 30 m/s

Time taken, t = 8 s

Average acceleration of the car is defined as the change in velocity divided by time.

$a=\dfrac{v-u}{t}$

$a=\dfrac{30\ m/s-0}{8\ s}$

$a=3.75\ m/s^2$

Hence, this is the required solution.

Answer from: Quest

correct it is c.) b b

Answer from: Quest

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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