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Unformatted text preview: Archemides principle Row 204 a. Scales give us the apparent weight, which is the normal force. When the object sits on the bottom buoy g N F F + = 25 15 10 N buoy g F F N = = = 13. In air an object weighs 25 N. When it is lowered completely into sea water (submerged) it appears to weight only 15 N. a. Determine the buoyant force on the object. b. Determine the density of the object. Alternate solution to part b If you did everything in part b using equations instead of switching to numbers you g F mg = g obj F m g = buoy fd fd F gV = buoy fd obj F gV = buoy obj fd F V g = obj obj obj m V = g obj buoy fd F g F g = obj g fd buoy F F = The resulting ratio may be worth knowing as a short cut. b. Need to find mass and volume of object to find density. Weight of the object is given. Finding mass of object is easy....
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