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## Homework Statement

A block of wood floats on water. The density of the

wood is .634g/cm^3. Its mass is 243 g. Find the minimum mass (g) of lead we

must attach to the block so that it will sink, along with the lead. The density of lead is

11.3 g/cm^3. Caution: you must take into account the buoyant force on the lead, as well

as on the wood.

## Homework Equations

B=pgV=Mg(weight of fluid displaced)

## The Attempt at a Solution

I know that I must apply bouyancy principles to Newton's Second Law but I am not sure exactly how to set up my equations. How should I attack this problem?