Let the height of the block inside the water level be 'h'
Then according to the law of floatation of bodies:
Weight of the body = Weight of the displaced volume




Hence the height of body above liquid level = 30 - 21 = 9 cm
So, the percentage of wood block above water level =
en block 30cm on a side has a density of0.7o/em. If it is floating in freshwater...
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