1) Sodium ions (Na') move at 0.85 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic
field has a strength of 0.25 T and makes an angle of 51.0 degrees
with the motion of the sodium ions. Assuming no other ions are
present in the arm, what would be the magnetic force on any of
these ions? (Na has a charge of 1.60 x 10" C)

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.