When does Bernoulli's equation apply to falling water from a pipe?

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Homework Statement



Multiple-choice physics problem 23 about a liquid falling freely from a vertical pipe, with answer options a) through e) giving formulas for the speed v in terms of v0, g, y and r0.

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The Attempt at a Solution


Are we calculating the water that is falling when it is outside of the pipe. Not within the pipe? I just want to clarify. Because if i assume that the function of the speed is out of the pipe, then i get a correct answer...
 
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  • Multiple-choice physics problem 23 about a liquid stream falling from a vertical pipe, with options a) v = sqrt(v0^2 + 2gy), b), c) v = sqrt(2gy), d) v = sqrt(v0^2 - 2gy), e) v = v0 + 2gy, and handwritten Bernoulli equation work with v^2 = r0^2 + 2gy.
    upload_2018-5-6_22-25-57.png
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  • Multiple-choice physics problem 23 on a liquid in free fall from a vertical pipe, with five answer options a) to e) giving formulas for speed v in terms of v0, g, y and r0.
    upload_2018-5-6_22-26-21.png
    27.3 KB · Views: 509
  • Multiple-choice physics problem 23 about a liquid falling freely from a vertical pipe, with answer options a) through e) giving formulas for the speed v in terms of v0, g, y and r0.
    upload_2018-5-6_22-26-23.png
    27.3 KB · Views: 723

Discussion

lc99 said:
Are we calculating the water that is falling when it is outside of the pipe.
Yes.
 
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