A5 kg book rests on a table. how much force is it exerting on the table?
(hint: think about acceleration due to gravity.)

If element x has 99 protons how many electrons does it have

Why does lightning travel from clouds to the ground?

Along wire carrying a 4.2 a current perpendicular to the xy-plane intersects the x-axis at x=−1.7cm. a second, parallel wire carrying a 3.0 a current intersects the x-axis at x=+1.7cm. part a at what point on the x-axis is the magnetic field zero if the two currents are in the same direction? express your answer to two significant figures and include the appropriate units.