Object 1 has mass m1, and object 2 has mass m2, which is smaller than m1. The distance between their centers is r. How does the gravitational force that m1 exerts on m2 (F1 on 2) compare to the gravitational force that m2 exerts on m1 (F2 on 1)

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?