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A hollow cubical box is 0.786 m on an edge. This box is floating in a...

A hollow cubical box is 0.786 m on an edge. This box is floating in a lake with 1/6 of its height beneath the surface. The walls of the box have a negligible thickness. Water is poured into the box. What is the depth of the water in the box at the instant the box begins to sink?

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