# physical science

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David builds a wood raft that weighs 100lbs (445 N). The bottom area of the raft is 4 meters and by 3 meters and the raft is 0.6 meters thick. When the raft is floats in water, what must the height of the water line be on the raft?

• physical science -

Buoyant force=Weight
ρ•V₁•g = Weight
V₁=x•y•z₁
ρ•x•y•z₁•g = Weight
z₁=Weight/ ρ•x•y•g =
=445/1000•4•3•9.8=0.0038 m =3.8 mm

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