No threads for quite a while - here's one to keep us ticking over...
Where is the centre of gravity of a hemisphere?
Your answers, clues, thoughts and questions?...
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No threads for quite a while - here's one to keep us ticking over...
Where is the centre of gravity of a hemisphere?
Your answers, clues, thoughts and questions?...
For a solid hemesphere its 3 * r / 8 from the center of the base.
For a hemespherical shell its r / 2 from the center of the base.:cool:
well this thread ended pretty fast.:D
A hemisphere of malleable material is flattened in to a thin sheet after making a cut along it's surface (pole to pole).
Where is it's C.G ?
did u work that out chrisf or quote it?? it was pretty fast! :D
i don't understand ure description thinktank - aren't you describing a square??
Does the maths forum increment post count...?
Aparently yes...interesting. I'll stop posting crap now...;)
I've done these problems before, I just dug out my old notes.Quote:
Originally posted by DavidHooper
did u work that out chrisf or quote it?? it was pretty fast! :D
ThinkTank, if you make your hemisphere from a thin sheet you will have a hemisperical shell C. of G. = r / 2 from the center of the base.
Oh ok. it can be done by taking strips of sqrt(1-x^2), finding area and relative mass then letting dx -> 0 and finding the solution by taking moments around the origin. I expect this is the way you did it all those years ago!
All the forums increment the same count - megatron has the highest count...