Protons having a kinetic energy of 4.70 MeV are moving in the positive x-direction and enter a magnetic field of 0.0650 T in the z-direction, out of the plane of the page, and extending from x = 0 to x = 1.00 m. Required:
Calculate the y component of the proton%u2019s momentum as they leave the magnetic field.

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.