Observe and explain: Thumbtacks have been used to pierce several holes in the si
ID: 2001521 • Letter: O
Question
Observe and explain: Thumbtacks have been used to pierce several holes in the side of a plastic soda bottle-all at the same height. Then the holes have been taped over, and the bottle has been filled with water (and the lid left off). When you remove the tape, you should see something like the drawing here. How do the various streams of water compare with each other What does this behavior indicate about the water pressure in the bottle at the level of the holes How must that water pressure compare to the pressure of the air outside (which is essentially equal to the pressure at the top surface of the water, too)Explanation / Answer
A fluid exerts hydrostatic pressure in all directions and the magnitude of the pressure increases with depth.
In the above experiment, since the holes are at the same height, all the streams are identical to each other.
This indicates that the water pressure in the bottle is same in all directions for all the holes (at same height).
The pressure of the water is larger than the pressure of the air outside which is why it can flow out of the hole.
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