Abullet whose mass is 30.2 g leaves a rifle with a muzzle velocity of 1,000 m/s. it strikes a block of wood (mass 5 kg), initially at rest, and remains embedded in it. after the bullet hits the block, what will be the velocity of the bullet-block system?

a. 30.2
b. 1.51
c. 33.1
d. 165
e. 6
f. 7.6
g. 6,000

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?