74. Someone squirts water from a hose at you on a hot summer day. You see the water coming
and react by putting your hands up in front of your face to keep the water out of your eyes.
Describe the chain of evens involved with vision and the brain that allows you to shield
your face from the water.
Answers: 3
Physics, 22.06.2019 00:30
Comedians like to joke that the reason we havenÃĸâŦâĸt been visited by intelligent life from elsewhere in the universe is that aliens have been monitoring earthÃĸâŦâĸs broadcasts of intellectually embarrassing tv programs, like gilliganÃĸâŦâĸs island, fear factor, the jersey shore, and the jerry springer showand so consider us far too primitive to merit a visit. letÃĸâŦâĸs 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 11:00
A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n
Answers: 3
Physics, 22.06.2019 18:00
Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in
Answers: 2
74. Someone squirts water from a hose at you on a hot summer day. You see the water coming
and reac...
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