Physics Two Ping-Pong balls each have a mass of 2.6g and carry a net charge of 0.500ìC . One ball is

Physics
Two Ping-Pong balls each have a mass of 2.6g and carry a net charge of 0.500ìC . One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain at rest there? Express your answer to two significant figures and …
Friday, January 24, 2014 at 5:00pm

Physics
A free electron and a free proton are exactly 0.70cm apart. Find the magnitude of the acceleration of the proton. Express your answer with the appropriate units. Find the direction of the acceleration of the proton. Find the magnitude of the acceleration of the electron. …
Friday, January 24, 2014 at 4:59pm