Bouyant Force/Physics help

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Bouyant Force/Physics help Anonymous Thu Apr 25 15:09:24 2013 No.5710003 [DELETED]

I'm taking an online physics course and I need help figuring a concept out, my professor gave this example:

"A raft made of balsa wood has an area of 10m by 10m and a thickness of 10cm. It is placed on a fresh water lake. What percentage of the raft will be above the water?
Fb has to support the weight of the raft: Fb=m*g=rho*V*g=120*10*9.8=11760N "

Can you explain where the 120 comes from?

>>	Anonymous Thu Apr 25 15:44:39 2013 No.5710055 Bump.

>>	Anonymous Thu Apr 25 15:56:08 2013 No.5710075 Just from looking at the equation you set up, it's pretty clearly the density of balsa wood.

>>	Anonymous Thu Apr 25 16:01:54 2013 No.5710084 >>5710075 It doesn't match up with the actual density of balsa wood.

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