Planet A has twice the mass of Planet B. From this information, what can we conclude about the acceleration due to gravity at the surface of Planet A compared to that at the surface of Planet B?

We cannot conclude anything about the acceleration due to gravity on Planet A without knowing the radii of the two planets.

Explanation:

This is so because

acceleration due to gravity (g) = Gm/r²

Where G= Newton's gravitational constant

              = 6.67 x 10-11 N * m2 / kg2.

             m = mass of the planet (in kg)  

              r = radius of the planet ( in m)

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

probably not the "magnets"in the magnet, so to speak, are thought to be electrons orbiting in shells. vurrent loops two sides to the loop