25% part (a) draw a system schema for considering the motion of the ball, and free-body diagrams for ball at these instants: when he is holding it and accelerating it upwards, when he has released it and the ball is moving up, at the top when the velocity is 0, and when it is coming down before he catches it. label the forces in your free-body diagrams to indicate the type of force, who is causing the force, and who is feeling the force. draw your diagrams so we can tell which forces are equal and which are larger. use our standard notation for forces, f typea→b

d) physical means can be used to separate the components of air.

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.

radiation

explanation:

heat is transmitted by radiation