Skid is driving his classy ride at 90 mi/hr down I-57 to Champaign for his gig at The Blind Pig. Since his Yugo is obviously a custom job, he does not have ABS brakes. While texting Mitch about the set list for the show, he looks up and notices he is about to crash into a stopped car. When he is 170 m from the car he puts on the brakes. (a) Calculate the coefficient of friction Skid needs so that he stops just before he hits the car. (b) If the coefficients of kinetic and static friction are actually 0.3 and 0.6, respectively, and based on what we discussed in class on this topic, is it possible for Skid not to crash into the car

frequency or wavelenth of em radiation in a vacuum

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.

truck y has a greater velocity than truck x.