Water flows through a horizontal tube of variable cross section. The area of cross section at A and B are 4 mm² and 2 mm² respectively. If 1 cc of water enters per second through A, find the speed of water at B?

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Water flows through a non-uniform tube of area of cross sections A, B and C whose values are 25, 15 and 35 cm2 respectively. The ratio of the velocities of water at the sections A, B and C is:

The correct option is D 21 : 35 : 15 By eqn of continuity: AV=constant⇒25V1=15V2=35V3⇒V1:V2:V3=125:115:135 =15:13:17 =21:35:15

Water flows through a non-uniform tube of area of cross sections A, B and C whose values are 25, 15 and 35 cm $^{2}$ respectively. The ratio of the velocities of water at the sections A, B and C is:

The correct option is D 21 : 35 : 15

By $e q^{n}$ of continuity: $A V = c o n s t a n t$
$\Rightarrow 25 V_{1} = 15 V_{2} = 35 V_{3}$
$\Rightarrow V_{1} : V_{2} : V_{3} = \frac{1}{25} : \frac{1}{15} : \frac{1}{35}$
$= \frac{1}{5} : \frac{1}{3} : \frac{1}{7}$
$= 21 : 35 : 15$