How many grams of flourine is used to treat 1kl of water?

Aballet student who learns with the of his instructor is demonstrating learning.

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.