A landmark 15-year study by the University of North Carolina at Charlotte shows that people who do NOT do what activity gained 18 pounds more than people who did? a. walking.
b. weight lifting.
c. light activity.

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?