Posted by jessica on Monday, December 6, 2010 at 1:48pm.
well, you know the metal will all be underwater. So the question is how much wood is under to support the weight of the metal.
bouyancy of wood= h*density water*area*g
that has to equal the weight of the entire rod.
h*densitywater(area)g-.1*densitymetal*g(area -h*denstiywood*area*g=0
dividing out area, g; divideing by density water.
h-.1spgrmetal-hspgrwood=0
h= (.1 spgrmetal)/(1+sprgwood)= about .5/(1.5)=33cm ?
check my work.
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