Use this free body diagram to help you find the magnitude of the force needed to keep this block in static equilibrium A. 80 N
B. 45 N
C. 60 N
D. 35 N

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?