If you go to the moon, which force is greater? The force of gravity that you exert on the moon or the force of gravity the moon exerts on you? The force you exert on the moon

The force the moon exerts on you

The force of gravity you exert on the moon equals the force of gravity the moon exerts on you

another one sorry

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?