The 30-kg gear a has a radius of gyration about its center of mass o of k o = 125 m m . if the 20-kg gear rack b is subjected to a force of p = 200 n , determine the time required for the gear to obtain an angular velocity of 20 rad/s, starting from rest. the contact surface between the gear rack and the horizontal plane is smooth.

the force on the thing and the distance the force moves the thing

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.

what is the actual question though?