how come leaning tower of pisa stay leaning for long time without any problem?
449264
From memory: The Leaning Tower has been slowly sinking into the earth since it was built.  When this was discovered by the original builders, they corrected for the lean by adjusting the line of the tower so that it curved away from the direction of lean, thereby compensating for the sink.  However, over the centuries, the building has continued to sink, thereby increasing the lean beyond the degree compensated for by the curve.\n\nFrom Wikipedia:\n\nOn February 27, 1964, the government of Italy requested aid in preventing the tower from toppling. A multinational task force of engineers, mathematicians and historians was assigned and met on the Azores islands to discuss stabilization methods. After over two decades of work on the subject, the tower was closed to the public in January 1990. In the time that the tower was closed the bells were removed to relieve some weight and cables were cinched around the third level and anchored several hundred meters away. Apartments and houses in the path of the tower were vacated for safety concerns. After a decade of corrective reconstruction and stabilization efforts the tower was reopened to the public on December 15, 2001. Many methods were proposed to stabilize the tower including the addition of 800 metric tons of lead counterweights to the raised end of the base. The final solution to correcting the lean was to remove 38 m3 of soil from underneath the raised end. The tower has been declared stable for at least another 300 years.
901157
Good question. I believe the answer is because Mario lives in a 2D world. In such a world objects don't have any size, which means they have no mass. This means objects do not fall to the ground like on the 3d earth we are used to. Therefore objects mealy stay where they are placed.\n\nI can explain Marios attraction to the ground by pointing out his brown magno shoes (patent pending) that pull him firmly towards the metal core of his 2d world. All other objects in the game are made of a non-magnetic material.\n\n\n\n\n*Brown magno boots available for koppas and turtles of all ages.
618210
Not due to gravitational pull?!
195652
the earth is a oblate spheroid....we do not fall to the edges because of the gravitational pull...
528357
because of the gravitational pull on the water, it comes down, not straight
1052731
Any object which is lying at a spot has a centre of gravity. If it is perfectly balanced it will continue to stand without falling unless it is acted upon by an external force. When it is standing by itself every small swirl in the air will disbalance it and it will fall because the centre of gravity will be shifted to one side and because gravity is attracting the bycycle - by Pascals Law - it will transmit the Gravitational Pressure equally in all directions and the bycycle will fall even with a very very small tilt.\nNow consider a moving bike. The inner ear of the rider has 3 small bones - the hammer, stirup and the anvil partially immersed in a fluid which maintains it level like water. Any tilt in the bike will tilt the rider. The body of the rider will immediately send signals to the rider to tilt his body in the opposite direction to maintain perfect equilibrium and balance. The body will immediately lean towards the other side of the tilt and the bike will also be tilted away from the tilt towards the centre of gravity and so the rider is the person who leans his body from side to side and keeps the center of gravity straight and prevents falling - SO PLAY A RIDE BY THE EAR - Ha Ha!
874216
its newtons first law, (objects in rest stay at rest unless a force is acted upon it which causes acceleration) and objects in motion stays in motion\n\naka intertia keeps the smaller peices moving in the same direction
269557
they don't actually tip over
1069669
gravity is stronger, leave it down
31427
It is likely due to the high phosphorus content of the iron. Another factor may be that in the ancient wrought iron a certain amount of slag particles which enhance the passivity.  Climate factors may be important too.  It probably does have a coat of rust though. An interesting analysis of the rust and surface film of the Delhi Pillar is here:\nhttp://www.iitk.ac.in/infocell/Archive/dirnov1/iron_pillar.html
48086
Sometimes, you weigh less, gravity's pull does not change, doy!
929189
I was just about to ask the same question. It is interesting that it is so evenly divided. Both sides think they are right. What keeps it from tilting one way or the other?
430653
When you look at a tall tower crane, the whole thing seems outrageous -- why don't these structures fall over, especially since they have no support wires of any kind? \nThe first element of the tower crane's stability is a large concrete pad that the construction company pours several weeks before the crane arrives. This pad typically measures 30 feet by 30 feet by 4 feet (10 x 10 x 1.3 meters) and weighs 400,000 pounds (182,000 kg) -- these are the pad measurements for the crane shown here. Large anchor bolts embedded deep into this pad support the base of the crane: \n\nSo these cranes are essentially bolted to the ground to ensure their stability. In the next section, you'll learn how tower cranes "grow." \n\nTower cranes arrive at the construction site on 10 to 12 tractor-trailer rigs. The crew uses a mobile crane to assemble the jib and the machinery section, and places these horizontal members on a 40-foot (12-m) mast that consists of two mast sections. The mobile crane then adds the counterweights. \nThe mast rises from this firm foundation. The mast is a large, triangulated lattice structure, typically 10 feet (3.2 meters) square. The triangulated structure gives the mast the strength to remain upright. \n\nTo rise to its maximum height, the crane grows itself one mast section at a time! The crew uses a top climber or climbing frame that fits between the slewing unit and the top of the mast. Here's the process: \n\nThe crew hangs a weight on the jib to balance the counterweight. \nThe crew detaches the slewing unit from the top of the mast. Large hydraulic rams in the top climber push the slewing unit up 20 feet (6 m). \nThe crane operator uses the crane to lift another 20-foot mast section into the gap opened by the climbing frame. Once bolted in place, the crane is 20 feet taller! \n\nOnce the building is finished and it is time for the crane to come down, the process is reversed -- the crane disassembles its own mast and then smaller cranes disassemble the rest.
941103
Because round covers don't fall in.  They are the same distance across, any way you turn them.  They always stay on top.\n\nIf it was square, it could fall in if placed at an angle or carelessly dropped by a worker.
369305
Not really it tends to make you lean with lots of endurance.  The resistance of water doesn't change.  However, if you see the pools where you stand up and fight the water.  Those can make people real strong.
1039588
Nothing to do with angular momentum. \n\nIf you weight the rims of the wheels of a bike to increase the angular momentum so that the wheels behave like a gyroscope (bike wheels are really light usually), the bike becomes almost impossible to ride.\n\nA bike stays upright because the centre of gravity at the front wheel is slightly behind where the wheel touches the ground (the bike forks bend forward). Because of this, if the bike tips to the right the front wheel turns to the left and vice versa. \n\nIf the bike is stationary this does not help a lot.\n\nBut if it is moving forward this tends to steer the bike out of toppling in the direction of lean, and this helps you to balance the bike ( a bike with no rider always falls over - its your sense of balance that keeps it upright).\n\nThe fast the bike goes, the more pronounced the self correcting steering is.\n\nPS bikes have been made with the forks bent backwards so that the self steering is in the direction of lean, so exaggerating a loss of balance -it is hysterical to see someone try to ride this sort of bike
225947
In plain terms, controlling your center of mass allows you to maintain your balance.  If your center of mass gets too far forward, you will start to fall forward; if it gets too far backward, you will begin falling backwards, and so forth.\n\nGood Luck!