Abaseball has a mass of 0.145 kg and is 12 m above the ground. if it has a mechanical energy of 105.8 j, how fast is it moving? 17 m/s 35 m/s 89 m/s 130 m/s

35 m/s

Explanation:

The gravitational potential energy of the ball is given by:

where

m = 0.145 kg is the mass of the ball

g = 9.8 m/s^2 is the gravitational acceleration

h = 12 m is the height above the ground

Substituting, we find

The mechanical energy is equal to the sum of the kinetic energy (K) and the potential energy:

We know that E = 105.8 J, so we can find the kinetic energy:

And from the equation for the kinetic energy:

we can find the speed of the ball:

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