- #1
Saladsamurai
- 3,020
- 7
Alrighty-
These questions are just to clarify some conceptual issues I am having.
When finding the vertical force component exerted on a curved surface, we have used two major methods:
1.) Buoyant Force=wt of liquid displaced
or
2.) F = the wt of the "missing liquid 'above' "
I) When am I allowed to use Buoyant force, and when can in not be used?
Here is an example:
If I want to find the vertical force acting on the half-cylinder abc =FV,Cyl
I can use buoyant force or the weight of the liquid above.
However, to find the vertical force acting on the half-sphere, I cannot use buoyant force.
Why not? Is it because there is a vertical pressure difference between the inside and outside of the sphere? (i.e., the inside has Pgas acting down whereas the outside has Patm acting up)
Is there a general rule that allows you to apply buoyancy that I can check for?
Thanks![Smile :smile: :smile:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
These questions are just to clarify some conceptual issues I am having.
When finding the vertical force component exerted on a curved surface, we have used two major methods:
1.) Buoyant Force=wt of liquid displaced
or
2.) F = the wt of the "missing liquid 'above' "
I) When am I allowed to use Buoyant force, and when can in not be used?
Here is an example:
If I want to find the vertical force acting on the half-cylinder abc =FV,Cyl
I can use buoyant force or the weight of the liquid above.
However, to find the vertical force acting on the half-sphere, I cannot use buoyant force.
Why not? Is it because there is a vertical pressure difference between the inside and outside of the sphere? (i.e., the inside has Pgas acting down whereas the outside has Patm acting up)
Is there a general rule that allows you to apply buoyancy that I can check for?
Thanks