Drawing lemonade of density 1000 kg/m3 up a straw to a maximum height

[Forceflow]

To suck lemonade of density 1000 kg/m3 up a straw to a maximum height of 3.3 cm, what minimum gauge pressure (in atmospheres) must you produce in your lungs?

I know i need to use P=pgh which equals 1000(9.81)(.033)
which equals 323.73
-Then i divide, so, 323.73/1.0125e5
that equals 3.197e-3

It said that my answer was wrong. It looks good to me. Thanks for the help.

 

[berkeman]

What's the conversion you are using from mks units to atmospheres?

 

[Cyrus]

You're answer better be negative.

 

[Forceflow]

thanks man, it was negative.

 

[Phoenixtears]

I just did this problem and was wondering why the answer was negative? How often can pressure be considered negative?

Thanks for the help!

~Phoenix