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Physics 18 Online
OpenStudy (anonymous):

George observed a difference in measurements for the same item at different altitudes due to variation in gravity. Which type of scale did he likely use?

OpenStudy (doc.brown):

A scale that is compressed between the item and the Earth. A counterbalance wouldn't work as gravity would affect both the item and the weight.

OpenStudy (anonymous):

Cold have used a pendulum and measured the period, proportional to sqrt(L/g)

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