How much energy would be released if we could completely convert the mass of a 4.50 kilogram rock into energy? joules one "megaton" is the amount of energy released by the detonation of 1 million tons of dynamite. one megaton is equal to 4.0 x 1015 joules. how many megatons of energy would be released by the conversion of this rock into energy?

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

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