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2.) calculate the density of a person who floats in water with 5% of her volume above the surface?

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- Thread starter jerick232002
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- #1

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2.) calculate the density of a person who floats in water with 5% of her volume above the surface?

- #2

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i don't know how. i think first to do is to look for the value of mass? and then?please help me..

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- #6

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For an object to float, it has to displace an amount of water equal to it's weight. In this case, when 70% of the wood is submerged, that amount of water equals the weight of the wood.

So how can you put all of this together with equations and come up with a way of expressing the volume?

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Mass = 1000 g /Volume??

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Weight of object = mg = weight of water displaced = mg

Density = Mass / Volume

Mass = Density x Volume

Weight of object = D

Weight of water displaced = D

So you get:

D

You can take out gravity:

D

You can also cancel out V

D

D = Density, V = Volume, g = gravity

Can you follow this?

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