What major advantage of space-based telescopes (such as the Hubble Space Telescope) over Earth-based telescopes? A. They are millions of miles closer to the subject.
B. They are less expensive to build and maintain.
C. They are above the Earth's atmosphere which can cause distortions.
D. They are affected less by the gravity of the Earth and the Moon.

Idon’t quite understand this problem

Anybody wanna ? (picture included? )

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.)