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In the middle of a horizontally positioned closed tube is a h=20 cm long column of...

In the middle of a horizontally positioned closed tube is a h=20 cm long column of Hg. Each side of the tube entraps a l=0.5 m column of air. The atmospheric pressure is H=100 kPa. When the tube is held vertically the column of Hg slides down with d=10 cm. By how much the column of Hg slide down from the middle of the tube if one end of the horizontally positioned tube is open. No image is provided.

                                      

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