Physics, 24.01.2020 20:31 naylorkanari54
An electric clock is hanging on the wall in the living room. the clock is unplugged, and the second hand comes to a halt over a brief period of time. during this period, what is the direction of the angular acceleration of the second hand? a. clockwise
b. counterclockwise
Answers: 3
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 03:40
Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.
Answers: 1
Physics, 22.06.2019 10:00
Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages
Answers: 1
An electric clock is hanging on the wall in the living room. the clock is unplugged, and the second...
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