Question

A 75kg surfer is paddling out on a 10.5ft wooden longboard with density 167kg/m3. Seawater has specific gravity of

1.03. Assuming none of the surfer is submerged at the moment, how much of the surfboards 7cm thickness is submerged? You may assume the board is perfectly flat and the surfer has reached behind the breaks where the ocean is calm.

Answer 1