# Directional water pressure?

1. Sep 22, 2008

### gloo

theoritically, if an empty cylinder (say 2 meters diameter) was pushed down 100 meters in the ocean and held there in equilibrium (not moving up or down), and the bottom was cut out, the water would rush up to fill the cylinder to a the same level as the ocean surface. What if there was a bucket of water that was just slightly smaller than the 2 meter diameter of the cylinder (so the water in the cylnder will not escape through over the bucket) lowered into the bottom (100 meters down), and the bottom was removed. Would the pressure of water at 100 meters push the bucket up?? How tall would the bucket have to be (filled with water), to stop the water pressure from pushing the bucket up?

thanks

2. Sep 22, 2008

### Staff: Mentor

3. Sep 24, 2008

### kate.k

meaning that the bucket is in the cylinder? and the bucket is "open ended"?

4. Sep 24, 2008

### gloo

Yes open at the top to the air.

5. Sep 25, 2008

### Staff: Mentor

Well, what do you think the answer is? From your first post, I think you could hazard a guess. If the ocean could support a column of water 100 m tall, would it really matter that the water is contained in a bucket? (Assuming we can ignore the weight of the bucket itself.)

6. Sep 25, 2008

### gloo

well Doc, i guess you are saying the bucket will be 100 meters.

7. Sep 25, 2008

### Staff: Mentor

Yep. Does that make sense to you?

8. Sep 25, 2008