Anonymous asked in Science & MathematicsPhysics · 2 years ago

!!Please help?

a 0.300 kg mass is attached to a 26.6 n/m spring. it is pulled 0.120 m and released. what is the speed of the mass when it is .0600 m form equilibrium?( Unit=m/s)

2 Answers

  • 2 years ago
    Favorite Answer

    The sum of kinetic and potential energy is conserved in a simple harmonic oscillator.

    We are told the mass is starting at an maximum elongation A=0.12 m with 0 speed.

    So total energy at that point is entirely held in the potential energy kA^2 / 2, because the kinetic energy is 0.

    E = kA^2 / 2 + 0 = 0.1915 J

    When the mass is getting pulled towards equillibrium point, this stored potential energy is being turned into kinetic energy of the mass.

    At x=0.06 m potential energy is only

    Ep = kx^2 / 2 = 0.04788 J

    So the missing part (0.1915 - 0.4788 = 0.14364) has gone to kinetic.

    mv^2 / 2 = 0.14364 J

    v = 0.979 m/s to 3 sig digits.

    In short you can always apply the rule x^2 + (m/k)v^2 = A^2

    Where A is the amplitude of the motion the body is going through.

  • Anonymous
    2 years ago

    0.04788 J

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