Recent content by dodonaomik

No Chinese (from mainland) has got the award( in physics), that's a pity. Nevertheless Tu Youyou got the Noble(in nature science), and becomes the 1st Chinese

Maybe the above fig is more helpful to calculate Fz

Equipped with a D=1.2m diameter hemispherical cap in the circular oil depots inclined wall, hemispherical cap center point O, depth of H=4m in the page. Inclined wall and thelevel angle of α=30 degrees, there is the density of ρ=900kg/m^3. and total tensionbolts a, b. All above...

In my opinion~~~~in my understanding, I really feel that we are unnecessary to know the weight of hemisphere and the thickness of shell of the hemisphere.And...yes! It's just a thin shell...a very thin shell... and we should ignore the thickness of the...

IT'S true that we are unnecessary to know the shell's thickness.ρgV( the part + the hemisphere)=Fz the part=the water on the hemisphere(at the moment, you can imagine that the hemisphere is sealed or closed.) the hemisphere= the water in the hemisphere(at...

First thank you so much, but I don't want to know the buoyancy(vertical upward), and I want to know Fz(vertical downward, as in the 1st fig.).

MY English about influid mechanics is weak, so please don't mind!

Sorry, I mixed up 2 concepts: Archimedes principle and Archimedes' spiral. Now I really cannot understand it_____How the fluid can be displaced by the hemisphere?

Thank you! I am not familiar with Archimedes' spiral, and I olny know it's equation. Additionaly your reply is irrelevant to this post.

Additionaly I don't know whether my method is right or not. (PP'Q'Q is an right angled trapezoid just the same as JJ'K'K)

Thanks for you replying. The hemisphere is not sealed, :smile:in other words, the hemisphere isn't closed.And I want to know the force which the river water exerts to the hemisphere.

andrevdh, 1st thank you for your replying. And you can imagine that one hollow hemisphere is located under one still river by 1 person. Of course the hemisphere is fixed obliquely as in the fig（ dip angle=30°）.

Homework Statement My English of influid meachanics is poor, so I only can hope that you can understand the figure (please forgive me!) Please find the force Fz which the hemisphere endures Homework Equations My way: "on" the hemisphere, I want to use triple integral（but I'm not sure...

I was ever sure the curve isn't an Archimedean spiral by calculation and verification. Please see the following 2 figures. (Of course, I may be wrong!)