Abullet with a mass of 5.00 x 10^-3 kg is loaded into a gun. the loaded gun has a mass of 0.52 kg. the bullet is fired, causing the empty gun to recoil at a speed of 2.1 m/s. what is the speed of the bullet?

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?