The spool of wire having a weight of 260 lb rests on the ground at b and against the wall at a. determine the force p required to begin pulling the wire horizontally off the spool. the coefficient of static friction between the spool and its points of contact is ms = 0.25.

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

here are some information of the future of geothermal energy:

-the future of geothermal energy can pretty much be summed up with a single word: more

-scientists plan in going deeper than 120 meters

-we are hoping that one day, we will get all of our energy from renewable energy sources such as geothermal energy

hope this !