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Q.

A person of height 1.65 m is standing upright. The additional external force required by blood vessel of length 1 cm, diameter 1 mm at feet to balance the pressure compared to similar blood vessel in head is
(Density of blood =1.1×103kgm−3,g=10ms−2)

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a

0.57 N

b

5.7 N

c

1.85 N

d

3.14 N

answer is A.

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Detailed Solution

P=ρgh=1100101.65=18161Pa

F=PA=18161×2π×12×10-310-2=0.57N

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