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Mcat pendulum question~~

Discussion in 'MCAT Study Question Q&A' started by johnwandering, Apr 18, 2012.

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  1. johnwandering

    johnwandering

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    SDN 2+ Year Member

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    A pendulum consists of an object of mass m = 1.65 kg swinging on a massless string of length l. The object has a speed of 1.97 m/s when it passes through its lowest point. If the speed of the object is 0.87 m/s when the string is at 70° below the horizontal, what is the length of the string?

    The relavent info is
    Ek= 1/2 mv^2
    Ep= mgh
  2. bajoneswadup

    bajoneswadup

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    I'm just guessing, but wouldn't you find energy change and
    divide that by the ac, since ac = tension? could be wrong
  3. dmf2682

    dmf2682

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    Rocket Scientist SDN 2+ Year Member
    I get roughly 1.6 m without using a calculator. What are the choices?

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