Determine the combined momentum of two objects. Object B has a
momentum of +22 kg. m/s and Object A has momentum of +20
kg. m/s.
kg. m/s.

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

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?

How do you know how many valence electrons an atom has?