You and you friend are sitting on the floor in an empty room a distance, d, apart, and you both have an equal mass. Assume the only force acting on you and your friend is the gravitational force you each exert on each other. No other forces are present. a. How long will it take due to gravitational forces before you and your friend meet directly in the middle? Note: You may assume the acceleration remains constant throughout the motion.
b. In reality, the acceleration is not constant and is continually changing. Why is this?
c. If the acceleration is changing, what effect will this have on the derived time? Will the time increase, decrease, or stay the same? Why?

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as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

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.

cant without the picture! ?