College Physics

Can someone check my answers for two and help me with the third?

1) A mass m at the end of a spring of spring constant k is undergoing simple harmonic oscillations with amplitude A.

Part (a) At what positive value of displacement x in terms of A is the potential energy 1/9 of the total mechanical energy?
x= A/3

Part (b) What fraction of the total mechanical energy is kinetic if the displacement is 1/2 the amplitude?
KE fraction= (3/4)

Part (c) By what factor does the maximum kinetic energy change if the amplitude is increased by a factor of 3?
KE'max / KEmax = ?

  1. 👍 3
  2. 👎 0
  3. 👁 4,766
  1. Part (c)9

    1. 👍 3
    2. 👎 0
  2. The Answer is 9.

    1. 👍 1
    2. 👎 2
  3. a is A/3

    1. 👍 1
    2. 👎 0
  4. Can someone explain what formula is being used to come up with A?

    1. 👍 0
    2. 👎 0
  5. A and B are correct and C is 9

    1. 👍 0
    2. 👎 0

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