anne is standing on skis and holding on to a horizontal rope with skis and holding on to a horizontal rope with which she will be pulled forward. The combined mass of Anne and skis is 59 kg. the coefficient of static friction between the snow and the skis is 0.14.​

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)

Diverging mirrors and lenses always produce images

Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (box after the "10" in answer is for the