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Problem 3.6 - Problem 3.6 Given Data on system before and...

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Problem 3.6 [Difficulty: 2] Given: Data on system before and after applied force Find: Applied force Solution: Basic equation dp dy ρ g = or, for constant ρ p p atm ρ g y y 0 ( ) = with p y 0 ( ) p atm = For initial state p 1 p atm ρ g h + = and F 1 p 1 A = ρ g h A = (Gage; F 1 is hydrostatic upwards force) For the initial FBD Σ F y 0 = F 1 W 0 = W F 1 = ρ g h A = For final state p 2 p atm ρ g H + = and F 2 p 2 A = ρ g H A = (Gage; F 2 is hydrostatic upwards force) For the final FBD Σ F y 0 = F 2 W
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