Question

Tubes AC and CB have the lengths
50 cm and 40 cm with radii 0.1 mm and
0.2 mm respectively. A composite tube s
formed by joining these two at C. Water
flow is steady in the tube. If the pressure
at point A is the pressure due to 100 cm
high column ofmercury and that of at B
is the pressure due to 70 cm high column
of mercury, then find the pressure at
point C.​

Answer 1

Answer:

Let

(in cm of Hg) be the pressure at the junction of A and B. <br> For of flow of liquid through tube A, <br>

<br> For tube

, <br> Pressure at which liquid leaves tube B, <br>

cm of Hg <br> Rate of flow of liquid through tube B <br>

<br> Here, <br>

<br> or

<br> On solving,

cm of Hg

Explanation:

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