Physics
Physics, 21.06.2019 14:30, iancuteodora30

According to plato after one is dragged out of the cave, the last thing that one sees is what

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Physics, 22.06.2019 00:30, WorkingButNotReally
Comedians like to joke that the reason we haven’t been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earth’s broadcasts of intellectually embarrassing tv programs, like gilligan’s island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. let’s check the assertion that aliens could have been receiving them. tv programs are broadcast at a frequency of about 100mhz with about 100kw of total power in 30frames per second, which emanatesroughly uniformly in all directions. assume that interstellar space transmits these broadcasts without attenuation. no matter how smart they are, aliens would require at least one photon per frame to interpret our signals. findthe number of photons per unit time per unit area reaching a receiver on a possible planet in the nearest star system, which is about 4 light-years away (a light-year is the distance light travels in a year). if aliens aimed a receiver or detector directly at earth, how big (in diameter) would it have to be to receive a photon per frame
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If you do 20 meters east turn around and go 40 meters west and turn again and go 35 meters east and your car was 15 meters from the starting line this took 5 seconds whats the car velocity
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Physics, 22.06.2019 10:00, mathscience9301
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According to plato after one is dragged out of the cave, the last thing that one sees is what...

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