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Torque of a swallow

  1. May 6, 2013 #1
    1. The problem statement, all variables and given/known data

    James Gomer holding a uniform 40 N rod of length 1 m horizontally with a hinge on its left end and a vertical string on the right end. Now suppose a fully laden swallow with a mass of 2.00 kg lands and squawks loudly on the rod at a point 30.0 cm to the right of the hinge. Now what is the force exerted by the string to keep the rod horizontal?

    2. Relevant equations



    3. The attempt at a solution

    I figured out that the string with no force exerted on the rod is 20N, so Far I have

    Ʃfnet = 2kg*9.8*20(moment arm) - F*20

    I don't think I have my setup correct though.. I'm just not visualizing this well
     
  2. jcsd
  3. May 7, 2013 #2

    haruspex

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    What point are you taking moments about? List the forces and their orthogonal distances from that point.
     
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