7. a steel marble leaves a 0.87-meter high table with an initial horizontal
velocity of 1.3 m/s. a.) predict the time required for the pool ball to fall to
the ground and b.) the horizontal distance between the table's edge and the
ball's landing location. y = 14t? x=vexet

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)