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A block of wood weight 4kg and has a rel...

A block of wood weight 4kg and has a relative density of `0.6` it is to be loaded with lead so that it will float in eater with `0.9` of its volume immersed. What weight of lead will be needed (a) if the is on top of the wood, (b) if the lead is attached below the wood ? (density of lead `=11,340kgm^(-3)`)

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