Question

By sucking through a straw , a boy can reduce the pressure in his lungs to 750mm of Hg (density= 13.6 g/cc) using a straw he can drink water from a max depth of ans: 13.6 ??

Answer 1

Answer:

126 mm

Explanation:

when like lung pressure reduces to 750 mm Hg then total pressure difference will be 10 mm Hg

when it is converted to water colum the depth will be

10(13.6-1) mm = 126 mm

Answer 2

Answer:

Ans. 13.6 cm

Explanation:

Pressure difference between lungs of student and atmosphere=760 - 750 = 10 mm of Hg

hdg = 10 mm of Hg = 1 cm of Hg

This pressure can only be used to drink water.

1 cm of Hg = pressure difference due to water column

=> 1 x 13.6 x g = h x 1 x g. [d of Hg=13.6 g/cm3]

=> 1 x 13.6 = h x 1

=> h = 13.6 cm

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