Answers: 1
Physics, 22.06.2019 00:30
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
Answers: 2
Physics, 22.06.2019 04:20
Calculate the capacitance of a system that stores 2.0 x 10^-10c of charge at 100.0 v. use c=q/v. a. 2.0 x 10^-12 f b. 2.0 x 10^-8 f c. 5.0 x 10^11 f d. 5.0 x 10^7 f
Answers: 1
Physics, 22.06.2019 12:20
A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.
Answers: 2
If an object has a mass of 1417g and it is moved 47 meters in 90 seconds, how much power was used?...
History, 29.09.2019 17:00
Biology, 29.09.2019 17:00
English, 29.09.2019 17:00
Biology, 29.09.2019 17:00
Health, 29.09.2019 17:00
Physics, 29.09.2019 17:00
Chemistry, 29.09.2019 17:00
English, 29.09.2019 17:00
Mathematics, 29.09.2019 17:00
Chemistry, 29.09.2019 17:00
Biology, 29.09.2019 17:00
Social Studies, 29.09.2019 17:00
History, 29.09.2019 17:00
Biology, 29.09.2019 17:00
Mathematics, 29.09.2019 17:00
Mathematics, 29.09.2019 17:00