1. In order for an object to begin to move, stop moving, or change direction, which of the following must be present?

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)

What types of radiation make up the electromagnetic spectrum?

If the pressure in a gas is doubled while its volume is held constant. true or false