A26 foot ladder is lowered down a vertical wall at a rate of 3 feet per minute. the base of the ladder is sliding away from the wall. a. at what rate is the ladder sliding away from the wall when the base of the ladder is 10 feet from the wall? would you expect the same rate when the ladder is any distance from the wall? would you expect your answer to be positive when the base is any distance from the wall? is there a physical reason why the rate is positive? at what rate is the ladder moving away from the wall when the ladder hits the ground?

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

Could someone me find the answer to this problem.

For which pair of objects would adding the same a