Anyone want to get a conversation going again? lol

In what direction does the medium move relative to the direction of the wave? explain.

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

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)