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Stratosphere
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What exactly was wrong with Newtons gravity. I understan that GR says that gravity is the curveture of space and time. However if Newton was wrong wouldn't that mean that F= GMm/d^2 is actualy wrong?
Stratosphere said:What exactly was wrong with Newtons gravity. I understan that GR says that gravity is the curveture of space and time. However if Newton was wrong wouldn't that mean that F= GMm/d^2 is actualy wrong?
For all eternity, predictions made on basis of Newtonian mechanics will remain as precise as they always have been.Stratosphere said:What exactly was wrong with Newtons gravity. I understan that GR says that gravity is the curveture of space and time. However if Newton was wrong wouldn't that mean that F= GMm/d^2 is actualy wrong?
Stratosphere said:How limited are we talking?
That was more of a post-diction than a prediction. That 43 arcsecond per century discrepancy was a known problem with Newtonian gravity at the end of the 19th century. The first successful prediction of GR was the bending of a ray light from some remote star as the ray passed by the Sun. GR predicted this result before it was observed in solar eclipses.jtbell said:One of the first experimental tests of GR was its prediction of the rate of precession of the perihelion of Mercury. Newtonian gravity predicted a rate of 5557 seconds of arc per century. The actual measured value is 5600 seconds of arc per century, consistent with Einstein's prediction from GR.
When experimenters (Pound and Rebka (Harvard), 1959) put a Mossbauer Effect experiment iron-57 14.4 keV photon source at the top of a 73.8 foot tower (roof of physics building) and a detector in the basement, the experiment showed that when the photons fall to the ground, their energy increases (doppler shift). Although the energy shift due to gravity was very small (about 1 part in 10^15), the measured energy shift agreed with GR predictions to about 1%. So both apples photons gain energy when falling from trees or tall buildings.ZapperZ said:Newtonian mechanics is also "wrong" at speeds near c. Do you see us abandoning Newton's laws when we build houses and buildings?
Zz,.
Newtonian Gravity is a theory proposed by Sir Isaac Newton in the 17th century that explains the force of gravity between two objects. It states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the distance between them.
In General Relativity, the equation F=GMm/d^2 still holds true, but the concept of gravity is explained differently. GR proposes that gravity is not a force between objects, but rather the curvature of space and time caused by the presence of mass. This curvature affects the motion of objects and is described by Einstein's field equations.
The main difference between Newtonian Gravity and General Relativity is the way they explain the force of gravity. Newtonian Gravity describes gravity as a force between objects, while General Relativity explains it as the curvature of space and time caused by mass. Additionally, General Relativity is a more comprehensive theory that can explain phenomena such as black holes and the bending of light.
General Relativity has greatly impacted our understanding of the universe by providing a more accurate and comprehensive explanation of gravity. It has also helped us understand the behavior of objects in extreme conditions, such as near black holes. GR has also been confirmed through various experiments and observations, solidifying its place in our understanding of the universe.
Studying Newtonian Gravity and General Relativity is important because they provide us with different perspectives on the force of gravity and its effects on the universe. While Newtonian Gravity is still useful for many practical applications, GR helps us understand phenomena on a larger scale, such as the behavior of galaxies and the expansion of the universe. Additionally, studying these theories can also lead to further advancements and discoveries in the field of physics.