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Q.

Blood flows through a main artery of area of cross section 2cm2  with a speed of 0.25ms−1 .  If it branches into several capillaries of total area of cross section 0.4m2 , the average speed of blood through each capillary is

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a

0.25ms−1

b

1.25×10−4ms−1

c

12.5×10−2ms−1

d

0.5×10−4ms−1

answer is B.

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Detailed Solution

A1v1=A2v2⇒2×10−4×0.25=0.4v2 ⇒v2=0.50.4×10−4=1.25×10−4m/s
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