Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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Water Level is Maintained in a Cylindrical Vessel up to a Fixed Height H. the Vessel is Kept on a Horizontal Plane. - Physics


Water level is maintained in a cylindrical vessel up to a fixed height H. The vessel is kept on a horizontal plane. At what height above the bottom should a hole be made in the vessel so that the water stream coming out of the hole strikes the horizontal plane at the greatest distance from the vessel.

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It is given that H is the height of the cylindrical vessel.

Now, let h be the height of the hole from the surface of the tank.
The velocity of water \[\left( v \right)\] is given by
\[v = \sqrt{2g(H - h)}\]
Also, let t be the time of flight. 

\[t = \sqrt{\frac{2h}{g}}\]

Let x be the maximum horizontal distance . 

\[ \therefore x = v \times t\]

\[ = \sqrt{2g(H - h)} \times \sqrt{\frac{2h}{g}}\]

\[ = \sqrt{4(Hh - h^2 )}\]

For x to be maximum,

\[\frac{d}{dh}\left( Hh - h^2 \right) = 0\]

\[ \Rightarrow 0 = H - 2h\]

\[ \Rightarrow h = \frac{H}{2}\]

  Is there an error in this question or solution?
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HC Verma Class 11, 12 Concepts of Physics 1
Chapter 13 Fluid Mechanics
Q 35 | Page 275
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