--%>
Assignment Help - homework help

Define Equivalence principle

Equivalence principle: The fundamental postulate of Sir Einstein’s general theory of relativity that posits that acceleration is basically indistinguishable from the gravitational field. In another words, when you are in an elevator that is utterly sealed and protected from the outside, and hence you can’t "peek outside," then when you feel a force (that is weight), it is basically not possible for you to say whether the elevator is present in a gravitational field, or whether the elevator has rockets joined to it and is accelerating "upward."

However that in practical conditions -- say, sitting in a closed room -- it would be probable to determine whether the acceleration felt was due to the uniform thrust or due to the gravitation (state, by computing the gradient of the field; if non-zero, it would point out a gravitational field instead of thrust); though, these differences could be made randomly small. The idea at the back is the equivalence principle is that it acts about the vicinity of a point, instead of over macroscopic distances. This would be not possible to state whether or not a given (random) acceleration field was caused by the thrust or gravitation by the use of physics by only.

The equivalence principle forecasts interesting general relativistic consequences since not only are the two indistinguishable to human observers, however also to the Universe as well -- any effect which occurs whenever an observer is accelerating must also occur in a gravitational field, and vice-versa.

   Related Questions in Physics

  • Q : Explain Correspondence limit or

    Explain Correspondence limit or Correspondence principle? Correspondence limit (N. Bohr): The limit at which a more common theory decreases to a more specialized theory when the situations that the

    		•
  • Q : Define Coulomb or SI unit of electric

    Coulomb: C (after C. de Coulomb, 1736-1806): The derived SI unit of an electric charge, stated as the quantity of charge shifted by a current of 1 A in a period of 1 s; it therefore has units of A s.

    		•
  • Q : Calculating current in magnetically

    For the magnetically coupled circuit in Figure a, calculate I1 and I2. If the dotted terminals in are changed so that the circuit now becomes that in Figure b, re-calculate I1 and I2.

  • Q : Define Noether theorem Noether theorem

    Noether theorem (Noether): A theorem that explains that symmetries are what gives rise to conserved quantities. For example, the translational symmetry (that is the fact that the laws of physics work the same in all positions) gives r

    		•
  • Q : Define Trojan points Trojan points : L4

    Trojan points: L4 and L5 are the two dynamically stable Lagrange points (that is, beneath certain conditions).

    		•
  • Q : Procedure to define the Specific Gravity

    Briefly explain the procedure to define the Specific Gravity?

    		•
  • Q : What is Ground source Heat Pumps Ground

    Ground source Heat Pumps (GSHP): This technology makes use of the energy stored in the earth’s crust, which comes mainly from solar radiation. Fundamentally, heat pumps take up heat at a certain temperature and discharge it at a higher temperatu

    		•
  • Q : What is Eotvos law of capillarity

    Eotvos law of capillarity (Baron L. von Eotvos; c. 1870): The surface tension gamma of a liquid is associated to its temperature T, the liquid's critical temperature, T*, and its density rho by: gamma ~=

    		•
  • Q : Explain Right-hand rule Right-hand

    Right-hand rule: The trick for right-handed coordinate systems to establish which way the cross product of two three-vectors will be directed. There are some forms of this rule, and it can be exerted in many manners. If u and v are two vectors that ar

    		•
  • Q : Explain Maxwells equations and its

    Explain Maxwells equations and its four elegant equation? Maxwell's equations (J.C. Maxwell; 1864): The four elegant equations that explain classical electroma

    		•