- #1

ChiralSuperfields

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- Homework Statement
- A legendary Dutch boy saved Holland by plugging a hole

of diameter 1.20 cm in a dike with his finger. If the hole was 2.00 m below the surface of the North Sea (density 1030 kg/m^3) (b) If he pulled his finger out of the hole, during what time interval would the released water fill 1 acre of land to a depth of 1 ft? Assume the hole remained constant in size.

- Relevant Equations
- Bernoulli’s Equation

For this part (b) of this problem

,

The solution is,

However, why are they allowed to assume for the Bernoulli's equation for the water outside the hole, that the water is stationary (i.e v_1 = 0)?

It also appears that they assume that the pressure inside the Holland is 1 atm, which is only valid when the water level is below the hole.

Many thanks!

The solution is,

However, why are they allowed to assume for the Bernoulli's equation for the water outside the hole, that the water is stationary (i.e v_1 = 0)?

It also appears that they assume that the pressure inside the Holland is 1 atm, which is only valid when the water level is below the hole.

Many thanks!