Question

A block cedar has a mass of 200 kg and density of 570 what fraction of the wood will be surface of block is floating in water

assume you mean what fraction of the VOLUME is under water
density = 570 kg/m^3 where water is 1000 kg/m^3
UNITS MATTER !!!
mass of wood = 570 * volume = 200
mass of water displaced = 1000 * volume under water
so
1000 * volume under water = 200 = 570 * volume
so
volume under water/volume = 0.570

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