April 1, 20179 yr In ap style problem section, #8 on fluid section, isn't the net force 800-4-707??? In the explanation you talked about the pressure holding the lid, but you didn't include in the net force.
April 3, 20179 yr Once the lid pops off, there's no longer a pressure differential holding the lid. Therefore you have 800N up, and 4 N down, for a net of 796 N up.
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