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Homework Help: True/False:Heat System

  1. Nov 14, 2007 #1
    1. The problem statement, all variables and given/known data

    Answer True or False?

    When the pendulum of a grandfather clock is heated, the clock runs more slowly. FALSE

    Cold objects do not radiate heat energy. TRUE

    In a bimetallic strip of brass and copper which curls when heated, the brass is on the inside of the curve. TRUE

    A copper plate has a hole cut in its center. When the plate is heated, the hole gets smaller. FALSE

    When the Celsius temperature doubles, the Fahrenheit temperature doubles. FALSE

    When heat is added to a system, the temperature must rise. FALSE

    2. Relevant equations

    3. The attempt at a solution

    I thought the answer was false, true, true, false, false, false...but it isn't right. Any suggestions?
  2. jcsd
  3. Nov 14, 2007 #2


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    A longer pendulum takes longer to swing. Imagine how long a 100m cable hanging from a crane takes compared to a clock pendulum.

    Objects at absolute zero don't emit heat. How cold does cold mean?

    Expansivity Copper 16.5 (m/m.K x 10-6) Brass 18.7 (m/m.K x 10-6)
    Which one expands more, which side of a curve gets longer?

    Do metals expand or contract when heated?

    Correct - Celcius and Fahrenheit don't have the same zero point.

    If it is an isolated system so that heat can't escape.
    Temperature is a measure of the average energy of the molecules, so if heat is added what happens to the energy?
    Last edited: Nov 14, 2007
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