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Gravity and Galileo

How Galileo gave acceleration due to gravity before Newton discovered gravity . exactly what happen
Asked Nikhil

Colorized engraving after Enoch Seeman's 1726 ...

Newton stated the Universal Law of gravitation and explained why objects fall to earth when dropped.

But objects were falling even before Newton explained it.

The concept of speed and velocity was known before the Law of Gravitation was formulated.

How is quantum simultaneity compatible with relativity?

When an entangled particle “collapses”, physics says that the other particle collapses simultaneously.

But that’s non compatible with relativity, which says that simultaneity depends on the place and velocity of the observer.


Events A, B, and C occur in different order de...
Events A, B, and C occur in different order depending on the motion of the observer. The white line represents a plane of simultaneity being moved from the past to the future. (Photo credit: Wikipedia)


So the question is:
– How can quantum disentanglement simultaneity be compatible with relativity? Do the entanglement state is dependent on the observer, in the mean that a pair of particles can be entangled for one observer and collapsed to other?
– What experiments fundament the answer? Is the answer only theoretical?


Asked Marraco


Awaiting response from visitors



Some Physicists and their contributions

Physicists outside India


  • Galileo – (formulated the basic law of falling bodies, constructed a telescope and discovered four moons revolving around Jupiter)

    Picture of Isaac Newton, Galileo Galilei and A...
    Picture of Isaac Newton, Galileo Galilei and Albert Einstein
  • Archimedes: Archimedes Principle and theory of floatation, Principle of levers)
  • Albert Einstein: Theory of relativity, (Special and General)
  • Isaac Newton: Laws of motion, The method of Calculus
  • Michael Faraday: Electromagnetic induction, dynamo


Physicists from India


    • CV Raman – (studied light scattering and discovered the Raman effect)
    • JC Bose – (pioneered the investigation of radio and microwave optics)
    • SN Bose –English: Satyendra Nath Bose in Paris 1925

      (worked out statistical method of handling bosons)

    • MN Saha – (best known for his development of the Saha equation, used to describe chemical and physical conditions in stars.)
    • HJ Bhabha (initiated nuclear research programs in India; carried out experiments in cosmic rays; calculated cross section for elastic electron-positron scattering)
    • Subramanyan Chandrasekhar:-Subrahmanyan Chandrasekhar in his later years

      (won the 1983 Nobel Prize for Physics for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars. The Chandrasekhar limit is named after him.)


Equilibrium – Numerical Problem

SOLID HEMISPHERE OF RADII R EACH, are placed in contact with each other with each other with their flat faces on a rough horizontal surface. A sphere of mass m and radius R is placed symmetrically on top of them. The normal reaction between the top sphere and any hemisphere assuming the system to be in state equilibrium is

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