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Homework Help: 3D Vector help

  1. Jul 30, 2013 #1
    This is my summer homework and my teacher gave us some new stuff to learn.
    1. The problem statement, all variables and given/known data
    1. A room has dimensions 3.00 m x 3.70 m x 4.30 m. A fly starting at one corner flies around, ending up at the diagonally opposite corner.
    a) What is the magnitude of its displacement?
    b) Could the length of the path be less than this magnitude? Greater? Equal?
    c) Express the components of the displacement vector in unit vector notation.
    d) If the fly walks along the walls (not necessarily along the edges), what is the length of the shortest possible path? Hint: It will help if you unfold the walls of the “box” and flatten them into a 2D plane

    2. Relevant equations

    3. The attempt at a solution
    I know that i have to put it into (3i-3.7j-4.3k), but I don't know what I have to do next
  2. jcsd
  3. Jul 30, 2013 #2
    for a) Think of Pythagorean theorem in three dimension.
  4. Jul 30, 2013 #3
    thanks a ton
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