2. A crane does 3.00 X 10^ J of work on a crate in order to lift it 20.0 meters to the roof of a construction site.
2. What is the potential energy of the crate with respect to the ground?
PE=
b. What is the mass of the crate?
M=

temp rises, and expansion

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.

it's