Aperson is studying newtons 3rd law. they are shown a hunting rifle example called recoil. when the refile
fires a bullet, what happens proving newtons 3rd law?
the bullet goes forward
when the bullet shoots out the gun moves backward
the gun heats up

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?