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Homework Help: Tension in springs (I don't know where 2 start)

  1. Nov 6, 2011 #1
    1. The problem statement, all variables and given/known data

    1) a spring has an elasticity constant of 225 newtons/meter. What is its restoring for when it's compressed of 20 centimeters ?

    2) with what force must we pull a spring to pull 8 centimeters if its elasticity constant is 2 newton/cm ?

    3) we suspend a weight of 4.08 kg to a spring and it pulls 8.5 cm
    a) what is the elasticity constant
    b) what force do you need to put to compress the spring 15 cm ?

    2. Relevant equations

    I honestly do not know beside Lnat, m1, L1, L2 and m2 I guess
    Something with Hooke's law

    3. The attempt at a solution

    There's something missing for me to understand this problem :|
  2. jcsd
  3. Nov 6, 2011 #2
    For 1 and 2, what equation do you have that relates the spring constant and the stretch distance with force?
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