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## Homework Statement

If a beam with square cross-section and very low density is placed in water, it will turn one pair of its long opposite faces horizontal. This orientation,however, becomes unstable as we increase its density. Find the critical density when

this transition occurs. The density of water is ρ v = 1000 kg/m3 .

## Homework Equations

Lacking any idea,do not know how to start.

## The Attempt at a Solution

I did not understand the question.Could someone clarify it and tell me the relevant equations.