A child drinks a liquid of density ρ through a vertical straw. Atmospheric pressure is $p_0$ and the child is capable of lowering the pressure at the top of the straw by 10%. The acceleration of free fall is g. What is the maximum length of straw that would enable the child to drink the liquid?
$\frac{p_0}{10ρg}$
2 )
$\frac{9p_0}{10ρg}$
3 )
$\frac{p_0}{ρg}$
4 )
$\frac{10ρg}{p_0}$
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