Mosses don't spread by dispersing seeds; they disperse tiny spores. the spores are so small that they will stay aloft and move with the wind, but getting them to be windborne requires the moss to shoot the spores upward. some species do this by using a spore-containing capsule that dries out and shrinks. the pressure of the air trapped inside the capsule increases. at a certain point, the capsule pops, and a stream of spores is ejected upward at 3.6 m/s, reaching an ultimate height of 20 cm. a)what fraction of the initial kinetic energy is converted to the final potential energy? express your answer numerically. ufki =b)what happens to the "lost" energy? choose the correct answerit has been transformed into thermal energy of the spores and surrounding air. it has been transformed into thermal energy of the spores and potential energy of surrounding air. it has been transformed into potential energy of the spores and kinetic energy of surrounding air. it has been transformed into potential energy of the spores and surrounding air.

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

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.