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A measuring cylinder contains of water. beads are immersed in it and the level of water rises to . Given that the mass of one bead is , what substance is the bead made of? Take the density of copper as ; iron as ; lead as .
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The bead is made of iron.
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of water. 
beads are immersed in it and the level of water rises to 
. Given that the mass of one bead is 
, what substance is the bead made of? Take the density of copper as 
; iron as 
; lead as 
.
