Suppose that a grandfather clock is calibrated correctly at sea level and is then brought up to the top of a tall mountain. What would need to be done to calibrate the clock at the top of the mountain?
1.Nothing, it should work fine since it was already calibrated at sea level.
2.The bob of the pendulum should be slid slightly down the rod.
3.The bob of the pendulum should be slid slightly up the rod.
4.It cannot be calibrated at the top of the mountain.
3
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