Question

A raft is made of wood with a density of 404 kg/m^3. It is 42 cm thick and its square area is 3.0x3.0 m^2. It is floating in seawater (density = 1025 kg/m^3). How many people of 68 kilogram can the raft hold before they start getting their feet wet?

Answer 1

Are they hanging the feet over the side? :_)


well, the bouyancy has to equal the weight.

weightwood+weightpeople=.42*3x3*1025*9.8N

Answer 2

No, I would guess they are just standing in the raft. Where does the 68 kg come into this?

Answer 3

We also know that when the raft is empty it is 61% above the water.