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Spring constant and oscillation frequency

  1. Dec 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A compact car has a mass of 1300kg. Assume that the care has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs.

    a.) What is the spring constant of each spring if the empty car bounces up and down 1.4 times each second?
    b.) What will be the car's oscillation frequency while carrying four 90kg passengers?


    2. Relevant equations



    3. The attempt at a solution

    I know for part a I will use f = 1/2pi [sq rt (k/m)], which will be k = m (f2pi)^2 when rearranged. I'm just not sure what the frequency would be.
     
  2. jcsd
  3. Dec 3, 2007 #2

    G01

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    For part a) the frequency is given to you. 1.4times/second is a frequency.
     
  4. Dec 3, 2007 #3
    The car bounces up and down 1.4 times each second. What is the definition of frequency?

    If you are talking about the second part, all you have to do is use the information you solved for, and change the mass accordingly.
     
  5. Dec 3, 2007 #4

    G01

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    The definition of a frequency is the "number of oscillations per second. This is what you are given. The car bounces up and down (oscillates) 1.4 times each second. So,

    f=1.4
     
  6. Dec 3, 2007 #5
    I tried using 1.4 for the frequency, and I got 1.01E5, but it wasn't right.
     
  7. Dec 4, 2007 #6
    Man, you can't answer his questions for him.

    How, exactly, did you solve it, aligass?
     
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