The human mandible (lower jaw) is attached to the temporomandibular joint (tmj). the masseter muscle is largely responsible for pulling the mandible upward when you are talking or eating. it is attached at a horizontal distance of about 3.2 cm from the tmj. if this muscle exerts a force of 222 n when you bite, what is the force your incisors exert? the horizontal distance from the tmj to your incisors is 6.9 cm. assume that both forces are vertical.

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?