An L-shaped glass tube is just immersed in flowing water such that its opening is pointing against flowing water. If the speed of water current is v, then:
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a
the water in the tube rises to heightu22g
b
the water in the tube rises to height g/2u2
c
the water in the tube does not rise at all
d
none of the above
answer is A.
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Detailed Solution
KE per unit volume = PE per unit volume12ρu2=ρgh ⇒ h=u22g