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A piece of iron with a mass of 790 g dis...

A piece of iron with a mass of 790 g displaces 100 g of water when it sinks. What does the iron weigh in air and under water?

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Weight of iron in air`=(0.79kg)(10(m)/(s^2))=7.9N`
Weight of water displaced`=((100)/(1000)kg)(10(m)/(s^2)=1N`
Weight of iron in water `=7.9N-1N=6.9N` Weight of iron in water`=7.9N-1N=6.9N`
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