Physics JAMB

The hydrostatic blood pressure difference between the head and the feet of a boy standing straight is 1.65 x 10^4 Nm−². Find the height of the boy. [Density of blood = 1.1 x 10³ kgm−³, g = 10ms−²]

A. 0.5 m
B. 0.6 m
C. 1.5 m
D. 2.0 m

Correct Answer:

Option C = 1.5 m

Explanation

[Density of blood = 1.1 x 10³ kgm−³, g = 10ms−²]
Pressure = pgh, where p = density, h = the height, g = acceleration of free fall due to gravity
1.6.5 x 104 = 1.1 x 10³ x 10 x h
therefore h = 1.65 x 10^4/1.1 x 10³ x 10 = 1.5m

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