Physics, 30.11.2020 01:00 candigirl8847
Two kids are playing tag. The first kid is running at an unknown speed chasing the other. The first kid has a mass of 25 kg and a KE of 450 J. How fast is the first kid running?
Answers: 2
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
Answers: 2
Physics, 22.06.2019 16:00, taylorbug6161
From the perspective of an employee that effective channeling of work related information and concerns
Answers: 1
Two kids are playing tag. The first kid is running at an unknown speed chasing the other. The first...
Mathematics, 08.12.2020 01:00
History, 08.12.2020 01:00
Mathematics, 08.12.2020 01:00
Mathematics, 08.12.2020 01:00
Health, 08.12.2020 01:00