. A negative point charge is creating an electric field of 50 000 N/C at some point P. How far away should another negative charge of be placed to create a net electric field equal to zero at point P?

Which is not true about oxygen-17 and oxygen-18?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration