Which describes what happens when fuel is ignited in a heat engine? chemical energy is converted into thermal energy. thermal energy is converted into solar energy. solar energy is converted into chemical energy. thermal energy is converted into chemical energy.

Apossible explanation for a set of facts that can be tested by further investigation is called

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)

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.