The distinction between mass and weight was discovered after Jean Richer transported pendulum clocks from Paris to French Guyana in 1671. He found that they

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The distinction between mass and weight was discovered after Jean Richer transported pendulum clocks from Paris to French Guyana in 1671. He found that they ran slower there quite systematically. The effect was reversed when the clocks returned to Paris. How much weight would you personally lose in traveling from Paris, where g = 9.809 5 m/s2, to Cayenne, where g = 9.780 8 m/s2? [We will consider how the free-fall acceleration influences the period of a pendulum in Section 15.5.]