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Homework Help: How much has the cable stretched?

  1. Feb 13, 2004 #1
    A truck is pulling a car out of a ditchwith a steel cable that is 9.1 meters long and has a radius of .5cm. When the car just begins to move the tension of the cable is 890N. How much has the cable stretched?
    converted .5cm to .005m
    area of the wire A = pie*r^2
    Y = 20E10 (steel)
    used the formula Change in L = F*orginal length/YA

    Change in L = 890N*9.10m / 20E10* (pie*.005^2)

    and got 5.2E-4 m

    did i go about this correctly?

    thanks joe
  2. jcsd
  3. Feb 13, 2004 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks OK to me.
  4. Feb 13, 2004 #3
    Now, is this cable apple, or cherry pie?

    I'm sorry I couldn't resist
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