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Finding weight of a mass

  1. May 14, 2013 #1
    Hey guys, i need you help to find the weightof a mass required to produce the same applied force to rods.
    (sorry english is not my first language) i will try to explain this with a diagram.

    1. The problem statement, all variables and given/known data
    First problem:
    So lets say i have 10 small rods with a diameter of 2mm and a length of 3cm.
    they are positioned next to each other, and stand on the ground. Then i have a weight that is applying force to those 10 rods alltogether. SO my question is, how much is the weight of the mass that i need, to make sure that every rods will be applied 50g(0,49N) each.

    [Broken]


    known values:
    F(on each rods)= 0.49N or 50g
    length of each rod=3cm
    diameter or a rod=2mm

    Problem 2:
    Now its exactly the same as situation 1, but the rods are positioned at a distance from each other, lets say this distance is x=2mm
    How much is the weight required for applying each rods the same force of 0.49N?

    [Broken]



    2. Relevant equations
    g=9,81ms-2
    1000g=1kg=9,81N


    3. The attempt at a solution

    Problem 1
    For applying each rod 0.49N,
    the mass should be= 10rodsx0.49N= 4,9N which is about 500g
    i wish it would be that easy, but i think theres got to be something that is not right?

    Problem 2
    this is actually very confusing, so i cant really know how to go with it, would you guys help me?

    Thanks!!
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. May 14, 2013 #2
    Seems like problem 1 is correct. Why would spacing the rods make a difference?
     
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