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Q.

Blood flows through a main artery of area of cross section 4 cm2  with a speed of 0.5 m/s . If it branches into several capillaries of total area of cross-section 0.2 m2 . The average speed of blood through each capillary is

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a

10−3m/s

b

2×10−3m/s

c

3×10−3m/s

d

4×10−3m/s

answer is A.

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Detailed Solution

A1v1=A2v2⇒4×10−4×0.5=0.2×v2⇒v2=4×10−4×120.2                 ⇒v2=4×10−40.4=4×10−44×10−1=10−3m/s
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