Compare the ke and pe of a 10kg child being carried at 2 m/s across a room; the child is 0.9 m above the floor

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)

How many neutrons does plutonium -196 with an atomic number of 78.

If a star is moving toward earth, it is