2. A powerful experimental sewing machine is powered by a mass-spring system. This sewing machine is capable of stitching 1,500 stiches in one minute.
a. How many stitches can this machine stitch is one second?
i. This is a measure of the sewing machine’s period or frequency?
b. If the sewing machine has a spring constant of 0.5 N/m, how large is the mass
that powers the oscillation motion of the machine? (Don’t forget to find T first)
Knowns Unknowns Formula

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?