Adolf and Ed are wearing harnesses and are hanging at rest from the ceiling by means of ropes attached to them. Face to face, they push off against one another. Adolf has a mass of 130 kg, and Ed has a mass of 72 kg. Following the push, Adolf swings upward to a height of 0.75 m above his starting point. To what height above his own starting point does Ed rise?

2.45 m

Explanation:

We are given that

Height,h=0.75 m

Initial velocity,

We have to find the height above his own starting point Ed rises.

Initial kinetic energy of Ed=Final potential energy of Ed

According to law of conservation of momentum

Initial kinetic energy of adolf=Final potential energy of adolf

Substitute the values

current flows in a wire

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.