Recent content by jlawson

  1. J

    Please see the attached file.When does the graph of

    Oh, yep, duh. Thank you very much for your help.
  2. J

    Please see the attached file.When does the graph of

    Please see the attached file. When does the graph of x(t)=5/6*sin⁡(10t-0.927) equal 5/12 5/12=5/6*sin⁡(10t-0.927) One answer, attached, is when the graph goes through the green points but I can't seem to figure out how to calculate the values of the red points. Any help would be...
  3. J

    2nd Order Linear - Modeling Spring Oscillation

    Oops, That's wrong but I figured it out. The total force acting on the mass, when it's stretched down past equilibrium, is: F = mg - k(s+x) The upward force "-k(s+x)" is negative and the downward force "mg" is positive because we assumed upward direction was negative and downward...
  4. J

    2nd Order Linear - Modeling Spring Oscillation

    Start with any spring attached to the ceiling of room. Attach a mass to this spring. The spring will stretch downward due to the mass attached to it. Eventually the mass, attached to the spring, will reach an equilibrium point. At this point, there are two forces acting on the mass: The...
  5. J

    2nd Order Linear - Modeling Spring Oscillation

    To my knowledge I assume: Newton's second law of motion : F = ma = mx'' Hooke's Law F = ks where s is the distance displaced by the mass. When a mass is attached to the spring, the new spring force is: F = k(s+x) While the downward force is still: mg If the two forces...
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