1. what is the study of the cosmos? the study of the cosmos includes what topics? 2. how do astronomers think the universe was created? 3. what evidence is there to support the big bang theory? 4. how is matter distributed within the universe? 5. what are galaxies? why is it important to study them? 1. how are stars important to the milky way? 2. how has the knowledge and perception of the universe changed over the past century? 3. what effect does dark energy have on the universe? 4. how is matter important to the universe? 5. what do scientists believe may be the fate of the universe? which theory do you feel is the better explanation of what may happen? why?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?