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This exercise starts with homework readings an instructor-lead discussion of the Earth's gravity and the gravitational force ending with a free-air gravity formula. The students are then introduced to operation of the Worden gravimeter and, in pairs, measure the gravity difference between a site on the ground floor and on the roof. They pool their data and determine their best estimate of the difference - which they compare to the free-air prediction. Typically the observation and prediction disagree, and the students are asked to formulate hypotheses for the difference. The gravitational force due to the building and contents is an easy hypothesis to test using the gravity formula and leads to an estimate of the mass of the building. The students compare this to simple estimates of the mass of the building (6 concrete slabs, 20m x 20m x .3m x the density of concrete) using measurements the students make and densities available in references. Uses online and/or real-time data Has minimal/no quantitative component
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