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Homework Help: Center of mass of a boat

  1. Oct 29, 2009 #1
    1. The problem statement, all variables and given/known data
    Romeo (80.3 kg) entertains Juliet (58.0 kg) by playing his guitar from the rear of their boat at rest in still water, 2.73 m away from Juliet who is in the front of the boat. After the serenade, Juliet carefully moves to the rear of the boat (away from shore) to plant a kiss on Romeo's cheek. How far does the 80.5 kg boat move toward the shore it is facing?


    2. Relevant equations

    Xcm=m1x1+m2x2+m3x3
    m1+m2+m3


    3. The attempt at a solution
    i dont really know what im doing on this problem because the professor didnt explain very well...at all
     
  2. jcsd
  3. Oct 30, 2009 #2

    tiny-tim

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    Science Advisor
    Homework Helper

    Hi Chuck 86! :smile:

    There are no (horizontal) external forces on the boat-and-Romeo-and-Juliet, so its centre of mass will stay in the same place! :wink:
     
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