User talk:Shahper

Welcome!

Hello, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are a few good links for newcomers: I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes (~&#126;); this will automatically produce your name and the date. If you have any questions, check out Where to ask a question or ask me on my talk page. Again, welcome! Oleg Alexandrov (talk) 18:00, 17 December 2005 (UTC)
 * The five pillars of Wikipedia
 * How to edit a page
 * Help pages
 * Tutorial
 * How to write a great article
 * Manual of Style

Your question
You asked on my talk page:

gravity
1) The center of gravity of an object ____ a) is always at its geometrical center ____ b) is always in the interior of the object ____ c) may be outside the object ____ d) is sometimes arbitrary ____ e) is a real physical point

Can you please tell me the answer ?

Answers.


 * (a) false usually. An arbitrarily shaped object does not have a geometrical center, like a piece of stone. But (a) is true if the body does have a geometric center, and the denisity is the same through the body (like a cube, sphere, tetrahedron).


 * (b) is false, (c) is true. Think of a body in a C-shape or O shape. Its center of graviity is somewhere in the hole, outside of the body.


 * (d) No, the center is not arbitrary. For a bounded body, the center of gravity is well-defined and there is only one.


 * (e) This question does not make much sense, because there is no such thing as a physical point. But, the center of gravity of any physical body can be located within certain error of measurement.


 * If you have more questions, please write on my talk page, at the bottom of the page. Oleg Alexandrov (talk) 18:00, 17 December 2005 (UTC)