What goes up must come down, is this true ? or is Sir Issac Newton a nut case?
370403
I would hardly refer to Issac Newton as a "Nut Case" - he had a brilliant mind and was one of the most influential people on our scientific knowledge of the world around us to date.\n\nAccording to Newton's Laws, an object experiences a force on it proportional to the product of its own mass and the mass of the Earth, and inversely proportional to the square of the distance between the centre of mass of the object and the centre of mass of the Earth.\nIf you throw an apple into the air, gravity attracts it back towards the centre of the Earth.\nHowever, if you throw it fast enough (faster than the escape velocity) which is about 11000 ms^-1 for Earth, then the object can leave the gravitational pull of the Earth entirely.\nThe calculation to prove this is simply an energy approach:\n0.5 * m * (EscapeSpeed)^2 = G * M * m / d\nRearrange for Escape Speed and it's about 11000ms^-1
324067
No. Gravity has to do with the mass of objects--you have some too.
744166
I just asked a question about the Montauk Project myself.I read the books.They seem to be very technically correct about a lot of the  things they talk about.So who-ever wrote them wasn't an idiot or a nut making up a story. I believe that the things spoken of in the stories are more than likely possible.Whether or not they actually happened as it is written,or if we really do possess this secret technoIogy, I don't know.In a way though,I kind of hope it isn't completely true,because the story of these projects are filled with abuse and inhuman treatment of human beings in the name of scientific developement and whatever else.
492939
Boy did you open a can of worms!\n\nThe Kennedy assassination is one of the favorite of conspiracy theorist (notice I did not say nut cases).  The theories range from LBJ (totally assinine) to the Mafia (more belivable).  They also include Cubans (espcially with Oswalds connections), the CIA (no one ever asked why, they just say the CIA did it), to just some nutcase (it may be true, but can you prove it).\n\nThe real reason will probably never be discovered, but as long as people ask questions, that will be one that will be asked.
213355
Draw of the cards thats all, but as Stephen Hawking has proven nothing can hold a good man down. \nhttp://www.pbs.org/wnet/hawking/cosmostar/html/cstars_hawking.html
923237
Isaac Newton was the greatest English mathematician of his generation. \nHe laid the foundation for differential and integral calculus.\nHis work on optics and gravitation make him one of the greatest scientists the world has known\n\nI also feel he made a step towards the understanding the workings of Karma as one of his laws of physic states. \n-- For every action there is an equal and opposite reaction. --\n\nIts all food for thought.
910319
Sure, it would require some force in the up direction, like a parachute.
955624
If it wasn't for gravity, there would be no earth.  (Gravity holds the earth together.)  \n\nThe very notion of "up" and "down" *needs* gravity, or it has no meaning.  The very notion of "down" has always meant,  "in the direction of gravity", even before we knew what gravity was.  If you are in a room with no windows, how do you know which way is "down"?  Because "down" is THE DIRECTION THAT THINGS FALL.  When you stand up, it's THE DIRECTION OF YOUR FEET.  Without gravity, there is no notion of falling, and no notion of "standing up" so "down" (and "up") have no meaning.  Think of astronauts in a room with no windows on the Space Station.  They have no "up" or "down". \n\nOr think of it another way.  The notion of "up" and "down" has less to do with the direction of the earth, as with the direction of gravity.  If you are standing on the moon, or on mars, which way is "down"?  It will be in the direction things fall ... towards the planet you are standing on.  So "down" is defined relative to the current direction of gravity, regardless of what is causing that gravity.\n\nSo the earth has no "up" and "down" except with respect to gravity.  It also has no "top" or "bottom" ... the North Pole is not the top of the earth.  We just like to make maps that way, but there's no scientific reason for it.    (The Egyptions drew maps relative to the Nile river ... so the "upper Nile" is South, and the "lower Nile" is North.)
181401
"what goes up must come down"... sorry thats the best i got...... sorry ive been at this way too long... i'm spent!
472213
Sir Isaac Newton, PRS, \n\n\n(4 January 1643 – 31 March 1727) [OS: 25 December 1642 – 20 March 1727] was an English physicist, mathematician, astronomer, alchemist, inventor, and natural philosopher who is generally regarded as one of the most influential scientists in history.\n\nNewton wrote the Philosophiae Naturalis Principia Mathematica wherein he described universal gravitation and the three laws of motion, laying the groundwork for classical mechanics. By deriving Kepler's laws of planetary motion from this system, he was the first to show that the motion of bodies on Earth and of celestial bodies are governed by the same set of natural laws. The unifying and deterministic power of his laws was integral to the scientific revolution and the advancement of heliocentrism.\n\nAmong other scientific discoveries, Newton realized that the spectrum of colours observed when white light passes through a prism is inherent in the white light and not added by the prism (as Roger Bacon had claimed in the 13th century), and notably argued that light is composed of particles. He also developed a law of cooling, describing the rate of cooling of objects when exposed to air. He enunciated the principles of conservation of momentum and angular momentum. Finally, he studied the speed of sound in air, and voiced a theory of the origin of stars.\n\nAmong Westerners, Newton played a major role in the history of calculus, sharing credit with Gottfried Leibniz. He also made contributions to other areas of mathematics, having derived the binomial theorem in its entirety. The mathematician and mathematical physicist Joseph Louis Lagrange (1736–1813), said that "Newton was the greatest genius that ever existed and the most fortunate, for we cannot find more than once a system of the world to establish
1046061
"I must study politics and war that my sons may have liberty to study mathematics and philosophy. My sons ought to study mathematics and philosophy, geography, natural history, naval architecture, navigation, commerce and agriculture in order to give their children a right to study painting, poetry, music, architecture, statuary, tapestry, and porcelain."\n--  John Adams
1166265
How many times must a man fall down?  that really depends on the one concerned.  Because a man has his life on his own hands.  His glory or his downfall depends on him.  That is a fact that is known by everyone. \n\nThe song actually tells that how many times must we fall before we begin to learn.
472461
Gauss and Euler have so much impacted the whole history and methodology of mathematics that they deserve my top score.\n\nLooking to the other answers, I believe Newton is a bit overvalued as a mathematician (not as a physicist of course): calculus was independently discovered also by Leibniz and received fundamental contributions by many others.\n\nI also want to spend a word about Henri Poincare, a mathematician of great vision, who was ahead his time and with his work on differential equations posed the foundations for modern math branches such as dynamical systems and chaos theory.
15807
If you define up as the direction towards the sky, and down as the direction a ball will fall when dropped, then there is no difference when you stand on the north pole, south pole or anywhere in between.\n\nThe Earth is spherical so Earth's gravity pulls in the same relative direction no matter where you are, down towards the center of the planet, so that makes down always towards your feet.\n\nAnd also since the Earth is spherical the sky will always be above your head, up. \n\nSo there is no difference in upside down or right-side up based on where you are on the Earth.
1124779
Up and down, in space, on earth, anywhere are established by convention.  Up is the direction we all agree to be up.  Usually, on earth we choose toward the center of the earth or along the earths gravity gradient to be down and up to be in the opposite direction.\n\nIn a place (like most of space) without a single over-powering gravity gradient, you have to develop a different convention.  If you watch the space shuttle astronauts, they tend to follow a convetion established by the shuttle builders.  Things are arranged, labeled, etc with the assumption of a floor and a ceiling and this provides the up/down convetion.
310268
Newton was talking about physical actions. Of course a lot of people believe in Karma...
212531
Finally a way for me to pick up that 7-10 split!  :)\n\nI agree with the basic premise of oscillating assuming a vacuum (since we are assuming no molten core, why not a vacuum as well?).\n\nBut, depending on the direction of the hole in relationship to the rotational axis of the earth, wouldn't the ball start bouncing against the sides of the hole due to the mechanics similar to that of a Foucault Pendulum?