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Q.

If liquid enters a section of tube of radius 2 cm with a velocity 20m/s , which what velocity does the liquid leave another section of the tube of radius 4 cm ? (The tube is horizontal)

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a

10 m/s

b

5 m/s

c

8 m/s

d

16 m/s

answer is B.

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Detailed Solution

πr12v1=πr22v2⇒r12v1=r22v2 ⇒(2)2×20=(4)2×v2⇒v2=4×2016=5m/sec
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