meta user
network profile
| bio | website | |
|---|---|---|
| location | Greece | |
| age | 73 | |
| visits | member for | 2 years, 4 months |
| seen | 5 hours ago | |
| stats | profile views | 3,313 |
Retired experimental particle physicist
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Mar 24 |
comment |
Is it possible to work on physics independently outside academia? @Deepak Vaid on the other hand there are less cranks in academia :). It is true that group think will affect the peer review process though, fashion etc. I have lived through many theoretical physics fashions. |
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Mar 24 |
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Iodine-131 half-life and reality On the other hand it means that the alarm can be lifted after a few lifetimes, so the precautionary ingestion of iodine, so that the thyroid does not use the radioactive one and the body ejects it with the urine (probably in less than a day), can be stopped. It has dangers too of over stimulation. |
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Mar 24 |
answered | Is it possible to work on physics independently outside academia? |
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Mar 23 |
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Cancel the Earth's magnetic field of course I mean attract them as the light attracts moths. presumably these crabs orient themselves with the magnetic field. |
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Mar 23 |
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Travelling faster than the speed of light The gas from your rocket will hit the back wall of the bus and transfer the momentum. |
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Mar 23 |
revised |
Cancel the Earth's magnetic field addition |
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Mar 23 |
answered | Cancel the Earth's magnetic field |
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Mar 23 |
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What are the Constraints on Building a Tower to Space? Wasn't it in an Arthur C. Clark science fiction story? |
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Mar 23 |
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Where's earths death bulge, destroying everything in it's path? Tom, the gravity of the moon is much less than the earth's so the effect of the moon is smaller. The sun has a great gravitational field but it is very far away, and the strength of gravity falls like 1/r^2 , so it ends up smaller than the moon's effect. |
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Mar 23 |
answered | Where's earths death bulge, destroying everything in it's path? |
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Mar 23 |
answered | Travelling faster than the speed of light |
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Mar 23 |
revised |
Can a car get better mileage driving over hills? carification |
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Mar 23 |
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Can a car get better mileage driving over hills? @Roy Simpson It is not enough that the car kills the engine to recover the energy used to fight the gravitational field, because on the uphill a lot more energy is consumed than that needed for compensating 1/2mgh, due to higher rpms for the part that is going up than on the flat road. I think that the argument plays with efficiencies, and probably it is too complicated to be decided without a computer model! |
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Mar 23 |
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Can a car get better mileage driving over hills? clarification |
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Mar 22 |
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Can a car get better mileage driving over hills? @Edward I drive very hilly roads half the week. I am not talking equal speed here. One incline I have to do 1st gear, the rpms hit the roof, there is one economic rpm range for cars. The engine gets hot.If I go lower rpms the engine will stall. |
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Mar 22 |
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Can a car get better mileage driving over hills? "essentially giving all our engine power into gravitational energy" . At that point you are in the less economic part of the car engine, high rpms slow mileage, not peak performance that you assume. Most of the gas is consumed in heating up the engine so it is not just against gravitational energy. This heat you will not get back downhill, you can only get the gravitational potential to kinetic back. The gas saved from having 0 rpms on the engine versus the economic rpms on the flat will not compensate for this. |
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Mar 22 |
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Can a car get better mileage driving over hills? @John if you do not need to use the brake, you will just break even. On this hill you will be spending more gas going up than on the level, and you will be on the inefficient rpms of your car. You cannot get more energy than you put in. Nobody seems to consider that the hilly road is a smaller distance than on the straight, for the same miles, to increase those miles per gallon for the straight part. |
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Mar 22 |
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Can a car get better mileage driving over hills? @John I cannot think of a more limiting case than energy conservation, which is what I am talking about. I just simplified the description to show up this. All the rest is dressing, like my uncle trying to make a perpetual motion machine with bicycle wheels and gears. Seems car enthusiasts do not believe in energy conservation !! |
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Mar 21 |
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Web references for Nelson's “Quantum Fluctuations”? I looked at the interference pattern and cannot make sense of it. There is no incoming beam. Why would the particles end up interfering like that is not clear, except by hand. An experiment now, that would be impressive. |
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Mar 21 |
revised |
Origins of the universe questions clarification |
