ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students?
each student bumps the shoulder of his or her neighbor.
at the exact time, all students take a step to the right
the students skip clockwise, going in a circular motion.
one at a time, each student lifts his or her hands up and then down.

One at a time, each student lifts his or her hands up and then down.  

Explanation:

In a transverse wave, the vibrations are perpendicular to the direction of motion.

If the students are standing in a circle, the direction of motion is around the circumference.  

One direction perpendicular to the direction is up and down.

Thus, if each student raises their hands up and down, they are simulating a transverse wave.

a force of 500                  

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.