You are towing a skier with a pwc and have an observer on board as required. how many people must the pwc be rated to carry

Arunner is training for an upcoming marathon by running around a 100-m-diameter circular track at constant speed. let a coordinate system have its origin at the center of the circle with the x-axis pointing east and the y-axis north. the runner starts at (x, y) = (50 m, 0 m) and runs 2.5 times around the track in a clockwise direction.

If element x has 99 protons how many electrons does it have

The radius of an atom is closest in size to a