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Archmides' Principle

  1. Mar 7, 2010 #1
    1. The problem statement, all variables and given/known data
    Calculate the true mass (in vacuum) of a piece of aluminum whose apparent mass is 4.2000 kg when weighed in air. (Express your answer as 4.2000 kg plus a positive or negative number.)
    (4.2000 + ________ ) kg

    2. Relevant equations

    Buoyant force = density x gravity x volume

    3. The attempt at a solution

    I'm guessing I have to find the amount of air displaced but I'm really not too sure on how to go about doing this
  2. jcsd
  3. Mar 7, 2010 #2


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    Homework Helper

    Mass of the aluminum is given. Find the density of aluminum and air from Wikipedia. Using the relevant formula find the volume.
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