A Clock Pendulum Made of Aluminum,which Has a Coefficient of Linear

question 39

Multiple Choice

A clock pendulum made of aluminum,which has a coefficient of linear expansion of 24 $\times$ 10^-6/K,has a period of exactly 1 s at 20ºC.Before a homeowner leaves town for one week,he turns the thermostat down to 10ºC.When he returns,the clock is

• A)fast by about 73 s.
• B)fast by about 7.6 min.
• C)exactly on time.
• D)slow by about 7.6 min.
• E)slow by about 73 s.

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