News tagged with equivalence principle
Equivalence principle in space test
May 11, 2009 |
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Since Galileo Galilei and Newton, the assumption is valid that inert and heavy mass are equivalent. This is, however, questioned by new physical theories such as the String theory. Now, the equivalence principle ...
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Testing the Equivalence Principle
May 21, 2007 |
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Standing on the Moon in 1971, Apollo 15 astronaut Dave Scott held his hands out at shoulder height, a hammer in one hand and a feather in the other. And as the world looked on via live television, he let go.
Moonbeams Shine on Einstein, Galileo and Newton
Physics /
Mar 06, 2005 |
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Thirty-five years after Moon-walking astronauts placed special reflectors on the lunar surface, scientists have used these devices to test general theory of relativity to unprecedented accuracy. The findings, which also conf ...
Steering atoms toward better navigation, physicists test Newton and Einstein along the way
Feb 18, 2007 |
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Stanford physicist Mark Kasevich has adapted the technology in today's airplane navigation systems to work with atoms so cold that they almost stand still. At temperatures scarcely above absolute zero, atoms no longer behave ...
A new way to test general relativity
Apr 16, 2007 |
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"Atom interferometry is an exciting field which has been awarded three Nobel prizes in the last decade," Savas Dimopoulos tells PhysOrg.com. “It is a new precision tool with a variety of applications.” Dimopoulos, a phys ...
Macro, not micro: modified theories of gravity
Feb 16, 2007 |
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When it comes to cosmology, the macro scale is important. As scientists search for the reasons behind the increasing rate at which the universe is expanding, they modify Einstein’s theory of gravity and delve into dark energy ...
Researcher Investigates the Basis of Einstein's First Approximation in the Theory of Relativity
Jul 15, 2009 |
4.1 / 5 (23) |
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(PhysOrg.com) -- In his discussion of accelerated motion on page 60 of The Meaning of Relativity, Albert Einstein made an approximation that allowed him to develop the theory of relativity further. Einstein apparently never ...
Nonlocality of a Single Particle Demonstrated Without Objections
Nov 09, 2007 |
4.7 / 5 (151) |
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Usually when physicists talk about nonlocality in quantum mechanics, they’re referring to the fact that two particles can have immediate effects on each other, even when separated by large distances. Einstein ...
ESA designs its smallest ever space engine to push back against sunshine
Space & Earth / Space Exploration
Mar 10, 2009 |
4.9 / 5 (9) |
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(PhysOrg.com) -- This month an ESA team is preparing to test the performance of the smallest yet most precisely controllable engine ever built for space, sensitive enough to counteract the force of incoming ...
Grant to Design Neutrino Detector
Oct 14, 2009 |
2.8 / 5 (4) |
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(PhysOrg.com) -- A consortium led by UC Davis physics professor Robert Svoboda will design the world's largest neutrino detector under a $4.4 million contract recently awarded by the National Science Foundation.
Starring Intelligent Aliens
Nov 05, 2009 |
4.7 / 5 (10) |
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The most probable place to find intelligent life in the galaxy is around stars very similar to our sun, a new study has found.
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