During blood transfusion the needle is inserted in a veinn where the gauge pressure is 2000 Pa. At what height must the blood container be placed so that blood may just enter the vein? [density of hole blood `=1.06xx10^(3)kgm^(-3)`]
(a). 0.192
(b). 0.182
(c). 0.172
(d). 0.162

Explanation

Here, `P= 2,000 Pa = 2 xx 10^3 N m^(-2)?,`
Density of blood, `p= 1.06 xx 10^(3) "kg m"^(-3)`
Since P=hpg
`h=P/(pg)`
`=(2 xx 10^(3))/(1.06 xx 10^(3) xx 9.8) =2/(10.4) =0.1923m`
The blood may enter the vein if the blood container is kept at a height slightly greater than 0.1923 m, i.e. at 0.2 m.