High-voltage power lines are a familiar sight throughout the country. the aluminum (resistivity = 2.82 x 10-8ω m) wire used for some of these lines has a cross-sectional area of 5.9 x 10-4 m2. what is the resistance of 14 kilometers of this wire?

The total resistance of a section of wire can be calculated using the equation pL/a, where “p” represents the resistivity of the material, “L” represents the length, and “a” represents the cross-sectional area. For this problem, simply substitute and simplify

Rwire = pL/a

= (2.82x10^-8)(14,000 m)/(5.9x10^-4)

= 0.6692 ohms

The resistance of this wire under these conditions would be approximately 0.67 ohms.

Hope this helps!

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.