physics
posted by Martin on .
Given that the mass of an electron is 9.1 x 10^28 grams and the charge on an electron is 1.6 x 10^19 Coulombs, calculate the voltage required to lift an electron 5 cm.
not quite sure how to do this.

Potential energy gain = q V = m g h
V = m g h/q
V = 9.1 * 10^28*10^3 * 9.8 *5*10^2 / 1.6*10^19 
Hi Damon .. where did the 10^3 come from? .. I understand the 9.8 is gravity and the 5 is 5 cm

Damon used kg for mass and meters for distance. Those units go with the 9.8 m/s^2 for g. The 10^3 and 10^2 are conversion factors from grams and cm.