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  • Water flows along a horizontal pipe of non-uniform cross-section. The pressure is 1cm of Hg, where the velocity is 35 cm/s. At a point, where the velocity is 65 cm/s, the pressure will be-<div

Water flows along a horizontal pipe of non-uniform cross-section. The pressure is 1cm of Hg, where the velocity is 35 cm/s. At a point, where the velocity is 65 cm/s, the pressure will be-

Option: 1

0.89 cm of Hg


Option: 2

0.5 cm of Hg


Option: 3

0.62 cm of Hg


Option: 4

1 cm of Hg


Answers (1)

best_answer

P_1+\frac{1}{2} \rho v_1^2=P_2+\frac{1}{2} \rho v_2^2

\begin{aligned} \left(10^{-2} \times 13.6 \times 10^3 \times 10\right)+\frac{1}{2} & \left(10^3 \times(0.35)^2)\right. & =P_2+\frac{1}{2} \times 10^3 \times(0-65)^2 \end{aligned}

\begin{aligned} P_2=1210 \mathrm{~N} / \mathrm{m}^2 & =\frac{1210 \times 10^2}{13.6 \times 10^3 \times 10} \mathrm{~cm} \text { of } \mathrm{Hg} . \\ & =0.89 \mathrm{~cm} \text { of } \mathrm{Hg} \end{aligned}

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Devendra Khairwa

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