If under a force downward normal to the ground, which is stronger, a dome or a parabolic structUre?
359367
The parabolic structure is stronger than a circular strucure or dome.\n\n---Addition---\n\nLet's think in an egg. An egg has two different shapes in each end, one is more rounded like an hemisphere and the other is more like the shape of a paraboloid.\nIf you press the egg from both ends, the egg brakes always \nfrom the more rounded one, the hemisphere looking shape instead of the paraboloid looking end.
279317
gravity.\n\nany shape of mass that is not spherical is gravitationally unstable
728166
This is because of their unique dome shape which draws the center of mass to its center axis and prevents it from breaking. Hence, a much larger force is required to break it then u expect. This dome shape is so powerful that if properly designed it can become unbreakable no matter how much load u put on them. This thing can see some old forts that have a dome on their ceiling which adds to their strength. Even now the modern structures which are being built today have dome shape as it provides strength to them and also contributes in prevention from earthquake.
863216
It has to do more with the material of the ground rather than with the surface. It all depends on it's elastic coeficient. The least elastic, the more it will bounce because of the transmission of the kinetic energy.
84559
Both marbles will hit the ground at the same time, but one will roll along farther.\n\nIn short, the vertical force from gravity is the same for both marbles.  The one hit sideways just has an additional horizontal velocity in addition to its vertical acceleration.
472579
Depends on the structural design.  Shear will take place near to supports.  Load pressures will take place all the way down to the foundations (getting larger all the way.\n\nSome structures will tend to push out (like a pitched roof) and some will push down (like a flat roof). \n\nIf you need anything more specific drop me a note.
991929
The surface on which the structure is being built.
432088
*copied from previous post\n\nYour question is unclear about what set of assumptions you want to use. You seem to imply a perfectly constructed stool, with a perfectly centered force, using incompressible material. You want the stool to have no mass, and you imply that you want to use statics to solve this problem. Strictly applying statics, this system is indeterminate, NOT the ridiculous answer of 0 [N] in two legs and W/2 [N] in the others. There are only 3 equations of equilibrium here, 1 for vertical forces and 2 for moments. Since you have four legs, this system cannot be solved by statics alone. Treating the stool as a deformable structure, you can use geometric compatibility to get a fourth equation. I challenge you to find a competently built stool that has 0 [N] in any leg (a physical stool built of real materials), or an incompetently built stool with 0 [N] in any two legs (unstable system that is obviously not static). The answer indicated as "correct" requires an incorrect application of statics. A large part of studying physics is learning when to use a particular tool, and the physical limits of that tool.
819002
When two plates collide, they BOTH begin to go under a bit.  However, when a continental, and an oceanic plate collide, the oceanic plate ends up going under more.  Why?\n\nFor one thing, the continental plate is up higher than the oceanic plate to begin with.  After all, continental plates are always above sea level, and oceanic plates are always below sea level.  With the advantage of heighth, the continental plate usually pushes the oceanic plate below.\n\nFor another thing, the continental plate is thicker than the oceanic plate, and therefore is going to be harder to crumple, squish, or flatten.\n\nAlso, the oceanic plate is already under an enormous downward pressure from all of the ocean on top of it.\n\nAdditionally, continental plates are lighter.  They were formed by materials on the primordial earth that had floated to the surface, while oceanic plates are formed out of the magma from the center of the earth, which was below the continental plates because it was heavier at the time the plates were forming.\n\nAnd finally, wet rocks are a great deal softer than drier rocks, so the continental plate is harder to bend or break than the oceanic plate, which is soaked all the way through.
486807
You will get 3 different answers until you specify which surface of each brick contacts the one above/below.  The answer comes out of the equation for the pressure each brick adds to the pile. (P=F/A)  Don't forget the lowest brick; it's own weight will cause the bottom of it to be under more pressure than the top!
596583
Mass. I think.Depending on how strong the gravity is your mass changes.
1144868
it is weaker the higher you go
98234
The crust is way lighter than the rock of the lower mantle, and its volume is tiny in comparison. So if by "easily" you mean how much energy is required to move the rock, then the crust moves around much easier than the rock in the lower mantle.
814087
It would actually work better if there were no outside air.  There would be no air resistance to deflect it or slow it down.
1114781
The simple answer is to have a mechanism for absorbing the impact of the fall. What to build depends on what materials you are restricted to.\n\nThere are several ways to go about it. Design a super-structure (the outside part) that crumples when hit. Suspending the egg is also a great idea (as was already suggested) If you can't or don't want to use a sock or stocking, using some kind of thick substance like gelatin would work well. Parachutes also work very nicely, I've seen some cool ones that worked like helicopters, spinning to slow down the descent. If you want a better answer I suggest posting whether you are restricted to certain materials.
837767
Bingo!!! You got it...air resistance.  If you dropped them in a total vacuum, they would both fall at the same rate.
773160
Do you mean a geodesic dome?\nHere are a few ways:\nhttp://www.monkeyc.org/dome/\nhttp://architecture.about.com/library/ucdome.htm\nhttp://www.pbs.org/wgbh/buildingbig/educator/act_geodesic_ho.html