1. A car with a mass of 750kg moves on flat ground. The friction force of the car is in the opposite direction of speed and is set at 200N. A. Calculate the engine power that the car starts from at a speed of 4 m / s in 5s. B. Calculate the acceleration of the car C. Calculate the change in the amount of motion and the change in kinetic energy​

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

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.

a is the best answer your welcome