Nope, an accelerometer placed in the hovering rocket will measure the full effect of acceleration. That is because the hovering provides the...
Yes Tach, that explains why the accelerometer doesn't register anything in free fall but the device still gets faster and faster as it falls, it...
Thanks Aqueous. But this bit still bothers me. In general relativity, free fall is the natural motion along a geodesic, which is not caused by a...
The following extracts are from Wikipedia and describe Accelerometers and the Equivalence Principle. An accelerometer is a device that measures...
Another way of expressing my problem. An astronaut who goes to the moon and back is younger but not shorter on his return but he has experienced both...
Thanks Alex and Janus. I knew that once back in the rest frame the clock would tick at the same rate as the rest clock but it would show a time...
GPS satellites suffer from time dilation caused by gravitational effects. I am talking abot velocity induced time dilation.
Lorenz worked out the maths but my question is to do with the fact the time dilation is a permanent effect and length contraction is temporary
We all know that time dilation is a real effect in the sense that a clock which is travelling very fast relative to the observer will tick slower and...
Good grief, old age is a terrible thing. He did say proton so that clears that up. However the Wiki link where I got the first quote from is here:-...
Rpenner: A photon is an elementary particle however, if experimentally probed at very short distances, the intrinsic structure of the photon is...
Thanks arfa brane. It does help. I had a horrible feeling that nobody would take my question seriously and come back with some answer which made me...
If the Higgs boson gives mass to other particles, how can it have mass itself? What gives the Higgs mass?
Bill Gates never did anything wrong in the legal sense but he was totally ruthless in the way he did business. This could be considered a moral crime...
The Higgs particle, its mass and what it does is predicted by the theory. The problem is finding it. The tracks of the smashed bits of the protons...
There is much excitement at the moment at the possible discovery of the Higgs boson and we are told that this particle confers mass to all other...
The answer is no. Pairs of particles are always coming into existence as matter and anti-matter. They usually destroy each another but if the...
Thanks James but your answer is more tantalising. Can you explain or give me a link to where I can understand how Gravity is caused by energy.
At the instant of the Big Bang we are told that there were four forces of equal magnitude one of which was Gravity. Then Gravity became relatively...
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