7. A cubical box, 1.6 m on each edge, has its base horizontal and is half-filled with water. The remainder of the box is filled with air under a gage pressure of 85 kPa. One of the vertical sides is hinged at the top and is free to swing inward. To what depth can the top of this box be submerged in an open body of fresh water without allowing any water to enter?

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