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A large open tank of water is filled to a height of 10 meters. Someone pokes...

A large open tank of water is filled to a height of 10 meters. Someone pokes a hole with a radius 2 cm at the bottom of it.

a) Find the speed of the water coming out of the hole.

b) How long does it take for 1 m3 to leak out?

c) Now assume the top of the tank is not open, but vacuum sealed at zero pressure. Now how long does it take for 1 m3 to leak out?

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