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Homework Help: Please help this problem!~

  1. Oct 17, 2007 #1
    Please help this urgent problem!~

    1. The problem statement, all variables and given/known data

    An elastic spring is made of two springs connected one after the other. The coefficients of the springs are k 1 = 1,476 N/m and k 2 = 3,271 N/m. Calculate the work necessary to strech the spring for x=10cm.

    2. Relevant equations

    E=0.5 * k * x^^2

    k= spring constant
    x= distance

    3. The attempt at a solution

    correct solution is 5.09 <-- this is from professor's note but I still find how this value became.. please help me out.
  2. jcsd
  3. Oct 18, 2007 #2


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    Homework Helper

    The net force acting on the point of contact of the 2 springs is zero... what is the force due to spring 1 on the point of contact... what is the force due to spring 2 on the point of contact...

    this gives a relationship between x1 (amount spring 1 stretches) and x2(amount spring 2 stretches)

    along with x1 + x2 = 0.1m

    you can solve for x1 and x2. then you get energy stored in the springs..
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