POSSIBLE POINTS 125 1. The illustration below shows an athlete participating in an Olympic hammer throw event. The athlete twirls the hammer (a
heavy steel ball attached to a wire) around several times before releasing it. The diagram below shows the path of the ball
as it is spun in a circle before its release.
G
O
Ball
Which arrow shows the direction of the centripetal force on the ball before the ball is released?

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?