Question

By sucking through a straw, a student can reduce the pressure in his lungs to 750 mm of hg (density = 13.6 gm/ cm3). Using the straw, he can drink water from a glass up to a maximum depth of

Answer 1

put.


d1v1=d2v2

put values.
calculate the unknown variable

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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