A5000-km long cable consists of seven copper wires, each of diameter 0.85 mm, bundled together and surrounded by an insulating sheath. calculate the resistance of the cable. use 3x10^-6 cm.ω for the resistivity of the copper.

The resistance of the cable is 37762.91 ohms.

Explanation:

let L be the length of the cable, A be the cross-sectional area of the cable and   r be the resistivity of the copper.

then, the resistance of the cable is given by:

R = r×L/A

  = (3×10^-8)×(5000×10^3)/(7×π((0.85×10^-3)/2)^2)

  = 37762.91 ohms

Therefore, the resistance of the cable is 37762.91 ohms.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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