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Homework Help: Magnitude of resistive force

  1. Oct 5, 2005 #1
    Tell me if im wrong or not, but you have a boat that weighs 1.70x10^8 kg and the engines are moving it with a forse of 7.40x10^5 Newtons.
    a.) I think that the magnitude of the resistive force exerted by the water is equal to the force the boat witch is 7.40x10^5, is this correct?
    b.) how do I find the upward buoyant force exerted on the boat?
    Any help would be great
  2. jcsd
  3. Oct 5, 2005 #2

    yes a is correct

    part b is a (mg) problem now just solve for m times g
  4. Oct 5, 2005 #3


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    Homework Helper

    I'm not sure you have enough information for the first part. I believe what you said is true only if the boat is travelling at a constant speed (ie. a = 0).
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