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    rolling wheel ~ angular rotational question?

    A 52.0-cm-diameter wheel is rolling along at 28.0 m/s. What is the speed of a point at the front edge of the wheel?
  2. ¢

    hexagonal unit cell read below?

    The element Mg has hcp packing with a hexagonal unit cell. The density of Mg is 1740 kg/m3. Calculate the volume (L) of the unit cell of Mg. I keep on getting this type of question wrong and I don't know what I am doing wrong... please show your work CLEARLY thanks
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