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Homework Help: Simple Harmonic Motion

  1. Sep 25, 2010 #1
    Please help me,

    Question
    The equation of motion of a mass is given as x = (0.2m) sin (3t). Find the velocity and acceleration of the mass when the object is +5cm from its equilibrium position.
     
  2. jcsd
  3. Sep 25, 2010 #2

    Doc Al

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    Given position, how do you find velocity and acceleration? (What are the definitions of velocity and acceleration?)

    Hint: Use a bit of calculus.
     
  4. Sep 25, 2010 #3
    how??
    for v i use dx/dt
    for a i use dv/dt

    so how to solve it, i also not understand the statement... anyone can help me
     
  5. Sep 25, 2010 #4

    Doc Al

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    Exactly. So find expressions for v and a. Then combine them with the expression for x.
     
  6. Sep 25, 2010 #5
    can u show me the work step... can?
     
  7. Sep 26, 2010 #6

    Redbelly98

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    You were given an expression for x, so find dx/dt for that expression.
     
    Last edited: Sep 26, 2010
  8. Sep 26, 2010 #7
    tq very much...
     
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