2. A clock based on a simple pendulum is situated outdoors in Anchorage, Alaska. The pendulum consists of a mass of 0.50 kg that is hanging from a thin copper rod that is 1.5 m long. The clock is calibrated perfectly during a winter day with an average temperature of - 10 °C. During the summer, when the average temperature over one 12-h period is 20 °C, by how much is the time off (in seconds) according to the simple pendulum clock during this 12-h period.

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