An 80 kg skydiver jumps out of a balloon

The balloon immediately begins to deflate, as the Hydrogen,

Helium, Hot Air, or whatever it's filled with begins to escape

through the hole the skydiver created when he jumped out.

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 .

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement