P15_079 - ( m t + m ` ) g = w V g = m ` = ( 1 g / cm 3 ) (...

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79. We consider the can with nearly its total volume submerged, and just the rim above water. For calculation purposes, we take its submerged volume to be V = 1200 cm 3 . To float, the total downward force of gravity (acting on the tin mass m t and the lead mass m ` ) must be equal to the buoyant force upward:
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Unformatted text preview: ( m t + m ` ) g = w V g = m ` = ( 1 g / cm 3 ) ( 1200 cm 3 ) 130 g which yields 1070 g for the (maximum) mass of the lead (for which the can still oats). The given density of lead is not used in the solution....
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