How do changes in light wavelengths support the big bang theory? a. lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving away from the earth. b. lights from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving toward the earth. c. lights from other galaxies shifts toward the red end of the spectrum, which shows that the galaxies are moving towards earth. d. lights from other galaxies shifts toward the blue end of the spectrum, which shows that the galaxies are moving away from the earth.

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.)

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

Could we see a galaxy that is 20 billion light-years away?