A 20-cm-diameter circular cover is placed over a
A 20-cm-diameter circular cover is placed over a 10-cm-diameterhole that leads into an evacuated chamber. The pressure in thechamber is 20 kPa. How much force is required to pull the cover off?
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a 20-cm-diameter circular cover is placed over a 10-cm-diameterhole that leads into an evacuated chamber the pressure
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