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in Physics by (45.1k points)
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A cubical block of wood of edge 3 cm floats in water. The lower surface of the cube just touches the free end of a vertical spring fixed at the bottom of the pot. Find the maximum weight that can be put on the block without wetting the new weight . Density of wood = 800 kg/m3 and spring constant of the spring = 50 N/m

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Fraction of volume immersed before putting the new weight 

i.e., 20% of 3 cm or 0.6 cm is above water. Let W is the new weight, then spring will be compressed by 0.6 cm.

W + weight of block = Upthrust on whole volume of block + spring force.

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