A shaft with a depth of h = 224 m was drilled into the mountainside and has a horizontal exit (Fig. 70). The outside air temperature is t0 = 0°C, the average air temperature inside the shaft is t = 14°C. The vertical shaft of the mine has a cross-section S = 3.5 m2. What force must be applied to the damper to close the vertical trunk from above? The air pressure at the level of the horizontal shaft of the mine is 760 mm Hg. Art. Take the molecular weight of air M equal to 29.

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