A simlple machine of velocity ratio 20 is used to lift a load of 600N by applying effort of 40N. Calculate the mechanical advantage and efficiency Of the machine. it a science numerical can you tell me the answer by step by step​

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)