A T-shirt cannon is made of pipe within which a light spring, with k=100 N/m, can be compressed to launch the bundled shirt of mass 0.3 kg. Imagine the spring compressed 0.15 m and then released. Ignoring friction, calculate the launch velocity (speed at which the T-shirt leaves the spring) in two cases: A horizontal launch A vertical launch HTML EditorKeyboard Shortcuts

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?