C. A rocket engine expels 875 kg of exhaust gasses at a speed of 3,200 m/s. As a result, the space ship increases its speed by 930 m/s. What is
the mass of the spaceship?

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?