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athrun200
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Homework Statement
See problem 3
Homework Equations
The Attempt at a Solution
In the solution, the interval for the integral of pressure is from [itex]P_{0}[/itex] to the required P.
However, I wonder that why we don't use net pressure as the intervals.
i.e. From [itex]P_{0}-P_{1}[/itex] to [itex]P-R[/itex]
Where [itex]P_{1}[/itex] is the pressure against atmosphere pressure and [itex]R[/itex] is the reaction force act on liquid by the bottom of the tube.
It seems the interval made by me make more sense than the solution since the interval match the meaning of [itex]dp[/itex] which is net pressure.