A charge Q is positioned at the center of a sphere of radius R. The flux of the electric field through the sphere is equal to Φ. If the charge Q is now placed at the center of a cube the flux of the electric field through the surface of the cube is equal to

If the speed of a particle triples ,by what factor does its kinetic energy increase?

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?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.