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a force of 10 N holds an ideal spring with a 20-N/m spring constant in compression. The potential energy stored in the spring is..? 0.5J, 2.5J, 5.0J, 10J, or 200J?

POtential energy? Wouldn't it be 1/2 kx^2,

but x= F/k, so 1/2 kx^2= 1/2 k*F^2/k^2 and that can be reduced.

  • physics -

    A 0.5-kg block attached to an ideal spring with a spring constant of 65N/m oscillates on a
    horizontal frictionless surface. The total mechanical energy is 0.79 J. What is the greatest extension
    of the spring from its equilibrium length?

  • physics -

    square root of(.79/(.5*65))

  • physics -

    a. PE = 1/2 * kx^2.

    or d = 10 * 1m/20N = 0.5 m.
    PE = 0.5*F*d = 0.5 * 10 * 0.5 = 2.5 J.

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