Why is more dew formed on grass and not on polished metal surface

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?