52. A 4.2x103-N piano is wheeled up a 3.5-m ramp at a constant speed. The ramp makes an angle of
30.0° with the horizontal. Find the work done by a
man wheeling the piano up the ramp.

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 .

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the components of a vector are the parts of the vectors that are to each other.

b perpendicular