A board that is 20 cm wide, 5 cm thick, and 3 m long has a density of 350 kg/m^3. The board is floating partially submerged in water do density 100 kg/m^3. What fraction of the volume of the board is floating above water?;

Answer 1

Density of water = 1000kg/m^3.

V = 3m * 0.20m * 0.05m = 0.03 m^3=Vol.
of board.

1 - (350/1000) = 0.65 = 13/20.