Question: You have a ( reusable ! ) drinking straw that is 3 0 cm long. You submerge most of the straw in a bucket of

You have a

(

reusable

!)

drinking straw that is

30

cm long. You submerge most of the straw in a bucket of water, then cover the top with your thumb, and then carefully remove the straw from the bucket, holding it ver

-

cally. You find that there is a column of fluid that remains inside the straw. Suppose that the column of water trapped in the straw extends from the

2

cm mark to the

18

cm mark

(

with distances measured from the boTTom of the straw

) .

What is the pressure of the trapped air at the top of the straw?

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