An object weighing 20 n moves horizontally toward the right a distance of 5.0 m. what is the work done on the object by the force of gravity?

Zero

Explanation:

The work done by a force on an object is given by:

where

F is the magnitude of the force

d is the displacement of the object

is the angle between the direction of the force and the displacement

From the formula, we see that if the force and the displacement are perpendicular to each other, then the cosine term is zero, so the work done is zero.

In this problem, the force is the force of gravity, which pulls downward, while the displacement is horizontal (in the right direction): so, the force and the displacement are perpendicular to each other, and so the work done by gravity is zero.

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.