Question: A Styrofoam cube, 25 cm on a side, is weighed on a simple beam balance. The balance is in equilibrium when a 20-g mass of

A Styrofoam cube, 25 cm on a side, is weighed on a simple beam balance. The balance is in equilibrium when a 20-g mass of brass is placed on the opposite pan of the balance. Find the true mass of the Styrofoam cube. We shall neglect the buoyancy of the brass.

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