A block of balsa wood is ?oating in water. (Balsa wood has a very small density.

Question

A block of balsa wood is ?oating in water. (Balsa wood has a very small density.) A stone is tied to the top of the block. The weight of the stone is chosen so that exactly half the wooden block is below the surface of the water. When the block is turned over so that the stone is underneath and submerged, will the amount of the wooden block below the surface of the water be (a) less than half, (b) still equal to half, or (c) more than half? Be sure to indicate the answer for the amount of the block below the surface, not above the surface.

Explanation / Answer

less than half as when it is upside down , the weight to be displacede by water has to be equal to the bouyant force now the stone + wood displaces water .. and this willl be lesser in wood volume than mere the merely wood displacing water . hence the wood is less submerged now

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