question_answer 15)

Fig.7. 8 (a) and (b) refer to the steady flow of (non-viscous) liquid. Which of the two figures is incorrect?

Answer:

Fig. (a) is incorrect. According to equation of continuity, i.e.\[\vartriangle {{l}_{1}}=\frac{{{F}_{1}}\times {{l}_{1}}}{\pi r_{1}^{2}\times {{Y}_{1}}}\] constant, where area of cross- section of tube is less, the velocity of liquid flow is more. So the velocity of liquid flow at a constriction of tube is more than the other portion of tube. According to Bernoulli's Theorem, \[\frac{\left( \text{10 }\!\!\times\!\!\text{ 9 }\!\!\times\!\!\text{ 8} \right)\text{ }\!\!\times\!\!\text{ 1 }\!\!\times\!\!\text{ 5 }\!\!\times\!\!\text{ 7}}{\text{22 }\!\!\times\!\!\text{ }{{\left( \text{0 }\!\!\times\!\!\text{ 125 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{-2}}} \right)}^{\text{2}}}\text{ }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 1}{{\text{0}}^{\text{11}}}}\] constant, i.e., where v is more, P is less and vice versa.