An ice skater with a mass of 65 kg moves along the ice with a constant velocity of 2.0 m/s. What is the skater's momentum?
A. 130 kg x m/s
B. 32.5 kg x m/s
C. 163 kg x m/s
D. 67 kg x m/s

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?