Recent content by chui

alright, I used Wikipedia, to learn some things with Integration, but it wasn't enought, I didn't understand too many things yet. however, I looked here: http://en.wikipedia.org/wiki/List_of_moments_of_inertia and learn the next things: 1) an axis located at the center of a solid cylinder ...

andrevdh andrevdh rights! (thankyouverymuch) All I need is the formula, with no other choice, I can develpoe it by myself but it will take time. I want it for other calculation so I only need a formula. If anyone know,(or have a book which know) please write it. thanks.

I am not a physics student yet, so I don't really know. By seeing diffrent exempls of moment of inertia I thoght it may be 0.25M(r1^2-r2^2) + 0.25ML^2 But this is only by intuation so I can't actually use it. please, help me if you can.

I couldn't find the Moment of inertia of the next tube: hope you can help..thnks

no mass? Well, Does this force not effected by the magnet Mass?! (unlike gravity etc.) why is that?

I have a formula, taken from Wikipedia: http://en.wikipedia.org/wiki/Magnet#Calculating_the_Magnetic_Force" But I didnt get the meaning of "mu" in this formula.. can anyone explain?

ok, tell me if what I am doing here is fine becous I think it isnt: for the R axis (Polar cordinatsr) it should be: v^2/r - MG/r^2 = F(r) now I can integrate this function (dr) from 40,000,000 to wherever I want the final distance from Earth to be. and get the acceleration on this axis...

An object starts at a velocity of 12,000meter/sec, (the direction tangent to an orbit around earth) from a distance of 40,000km from Earth's center. How can I calculate its track? thnks.

"scientists can produce magnets as strong as 40,000 Gauss" now when Ill come to calculate the force between two of these magnets, I will have to know their "strength". according to the 40K Gauss, what will be this strength? In other words, what does 40,000Gauss tell me about its strength...

HallsofIuy, I already new that formola, but I also asking for some explanation about the value of the "strengths"..

I don't need an exact formola, but somthing for me to know how hard it is to make a really big rejection force. What are the parameters for magnet's force? How do I find out their value? How can I put them together in an equation, to know what the force is? thnks, grasia, spassiva and so...