to measure the time period of simple pendulum cut a piece of a string 1 metre long attach a small clay bob and to one end of the string .starting at the angle of 10 degrees allow the pendulum to swing and measure the pendulum for 20 oscillations using stopwatch

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?