Find the force can be added to the following forces that will make it in equilibrium. F1 = 10 N, due East F2 = 20 N, due 20o North East F3 = 30 N, due 30o South of West

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?