Asatellite dish has the shape of a parabola when viewed from the side. the dish is 56 inches wide and 49 inches deep. how far is the receiver from the bottom of the dish if the receiver is placed at the focus?

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)