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Q.

Due to disease the main artery enlarged and the area of cross section become 2 times the previous value. The speed of the blood in the un enlarged artery is 0.8 m/ sec. The excess pressure on the walls of artery due to enlargement is (density of blood 2000kg/m3 )

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a

250 pa

b

500 pa

c

400 pa

d

480 pa

answer is D.

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Detailed Solution

A1v1=A2v2                                          A(0.8)=2Av2                                 v2=0.4                p2−p1=ρ2(v12−v22)=20002[(0.8)2−(0.4)2]=1000(0.64−0.16)=1000×0.48=480pa
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Due to disease the main artery enlarged and the area of cross section become 2 times the previous value. The speed of the blood in the un enlarged artery is 0.8 m/ sec. The excess pressure on the walls of artery due to enlargement is (density of blood 2000kg/m3 )