Which of the following descriptions of gravitational force is NOT true? A. It depends on the mass of objects.
B. It is a repulsive force.
C. It depends on the distance between objects.
D. It exists between all objects.

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

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