Alarge uniform density cube of mass m and side l is floating upright in a pond exactly half submerged. a small steel ball of mass m/2 is dropped directly over its center from the height h. assume that the head-on collision is perfectly elastic and that the steel ball rebounces vertically, 1. find the height the steel ball rebounds. 2. find the depth to which the large cube descends. express your answers in terms of m, l, g, and h. neglect all forms of dissipation and assume that the water surface remains level at all times

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

3. dark matter

empty space could also be a simple vacuum

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.