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Posted by on Monday, August 4, 2008 at 11:03pm.

A simple pendulum is 9.00 m long.


(a) What is the period of simple harmonic motion for this pendulum if it is hanging in an elevator accelerating upward at 2.00 m/s2?

I keep getting 6.7, but it's wrong

  • Physics - , Tuesday, August 5, 2008 at 12:51am

    If it is accelerating upward at that rate, the effective value g is
    g' = g + a = 11.8 m/s^2
    instead of 9.8 m/s^2.

    The period will be 2 pi sqrt(L/g')= 5.48 s

    Apparently you used g' = g - a. That only applies if the elevator is accelerating downwards.

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