The star Alderamin has an apparent magnitude of 2.4 and an absolute magnitude of 1.4.The star Merak has an apparent magnitude of 2.4 and absolute magnitude of 0.5.Assuming that neither star has been dimmed by interstellar clouds, we can say for sure that Merek is:A) the same distance as Alderamin from Earth. B) farther away from Earth than Alderamin. C) an intrinsically fainter star than Alderamin. D) closer to Earth than Alderamin.

A110-pound person pulls herself up 4.0 feet. this took her 2.5 seconds. how much power was developed? 0.13 hp 0.32 hp 2.0 hp 3.1 hp

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

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is