2- On what factors does Mus and Muk depend?

μs and μk are depend upon the average bond strength between the two surfaces. The normal force along a flat surface is simply equal to the weight of the object, or N = mg. N is an indirect measure of the number of bonds formed between the two surfaces.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.