Derivation of the shape of a clepsydra

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SUMMARY

The discussion focuses on deriving the shape of a clepsydra, a historical water clock, under the condition that the water level decreases at a constant rate. The key principle involved is Torricelli's Law, which relates the speed of fluid flowing out of an orifice to the height of the fluid above it. The solution requires establishing a relationship between the volume of water and the height, leading to a constant rate of change in height over time. The problem can be approached through the Calculus of Variations, although a simpler geometric shape may suffice for practical purposes.

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Homework Statement


Clepsydra was a water clock used in old times in which water was allowed to espace through a small hole at the bottom. Find the shape of the clepsydra, if the water level is to fall at a constant rate.


Homework Equations


Torricelli Law


The Attempt at a Solution


No clue.
 
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The point is that water falls at a constant rate- that is, the volume of water is reducing at a constant rate dV/dt. If you know the shape of the curve forming the walls (I would assume a volume of rotation), you can find V as a function of h, then you can find dV/dt as a function of dh/dt and find the function so that dh/dt is also constant. In its full generality, this is a "Calculus of Variations" problem but you are probably expected to guess a simple shape and then show it is correct.
 

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