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Homework Help: Calorimeterplease help

  1. Feb 16, 2009 #1
    1. The problem statement, all variables and given/known data

    A clock is designed with a simple pendulum, consisting of a mass at the end of an aluminum rod, whose period is supposed to be equal to one second. The clock is designed to keep accurate time at 20.0°C, but is operated at a constant temperature of −80.0°C. (a) Will the clock run fast or slow? Explain. (b) How many periods will the pendulum go through before the clock is off by 1.00 s? (The coefficient of linear expansion of aluminum is 2.31×10−5 1/C°.)

    2. Relevant equations
    Q = cmΔT
    Qw + Qo = 0
    ΔL = LiαΔT

    3. The attempt at a solution
    i tried several time using those equation above, but it didnot give the right answer, please help or give me hints.thank
  2. jcsd
  3. Feb 16, 2009 #2


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