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9.1 , fluid mechanics — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics9.1 , fluid mechanics1 Mark
MCQ
Figure here shows the vertical cross section of a vessel filled with a liquid of density $\rho$. The normal thrust per unit area on the walls of the vessel at the point $P$, as shown, will be
  • A
    $h\rho g$
  • ✓
    $( H - h ) \rho g$
  • C
    $H\rho g$
  • D
    $( H - h ) \rho g \cos \theta$
✓

Answer

Correct option: B.
$( H - h ) \rho g$
b
Since pressure is directly proportional to the depth below water surface and is same in all the directions.

At point $P$ depth of the water is $( H - h )$, so pressure i.e. normal thrust per unit area at $P$ is equal to $( H - h ) \rho g$

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