Equilibrium!

Classical Mechanics Level 3

Two bodies of different mass but equal volume are in equilibrium on a lever. Will the equilibrium get disturbed if the lever is immersed in water so that the bodies are completely immersed?

No, never Yes, always Can't say Depends on the amount

1 solution

Hjalmar Orellana Soto
Oct 22, 2019

If they have different masses, say, $m_1$ and $m_2$ , to be in equilibrium they will be at different distances $r_1$ and $r_2$ from the pivot. If now the whole system is sumerged, as both bodies have the same volume, equal bouyant forces will appear at $r_1$ and $r_2$ , but if those foces are of the same value, the only way of mantaining equilibrium is to have $r_1 = r_2$ and $m_1 = m_2$ , which is not necessarily true.

Equilibrium!

1 solution

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