Which of these objects absorbs most of the light that strikes it? a hand mirror, a white car, a black sweater, or a pane of glass?

According to newton’s first law of motion, which force is expected to cause a body to accelerate?

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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)