Arocket expels gas at a high speed out of its back for a short period of time. we are going to treat the rocket as being far away from any gravitational objects. (a) draw a momentum chart for the rocket expelling gas in space. take the initial time before expelling gas and the final time after the rocket has finished expelling gas. the rocket has an initial constant speed in the horizontal direction. put the rocket and the expelled gas on separate rows. (b) use your chart to explain why the rocket speed increases. (c) does the rocket have to keep expelling gas to stay at a constant speed? explain.

this is a good question! i'll do some research and come back when i have the answer!

trig 15.3 cos

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.