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By sucking through a straw, a student can reduce the pressure in his lungs to 750mm of $H g (density = 13.6 g / {cm}^{3})$ . Using the straw, he can drink water from a glass up to a maximum depth of (in mm)

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Detailed Solution

Pressure difference between lungs and atmosphere $= 760 - 750 = 10 m m o f H g$

${Hρ}_{w} g = H_{Hg} ρ_{Hg} g \Rightarrow H = \frac{ρ_{Hg}}{ρ_{w}} \Rightarrow H_{Hg} = \frac{13.6}{1} = 13.6 cm$

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