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What type of energy does a battery contain? What is the weight of 20 sheets of copier paper? How many grams of KCIO3 are needed to make 30.0 grams of KCI? How to uproot a pipe that's 30 feet long? A copper wire is 30.75 cm long and weighs 1.691 g. The density of copper is 8.933 g/cm3 . What is the radius of the wire in millimeter?