Posted by chibi on Thursday, June 13, 2013 at 2:21am.
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  Elena, Thursday, June 13, 2013 at 7:10am
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