Which best distinguishes between the inner and outer planets?
a. an asteroid belt is the dividing line between the inner and outer planets.
b. the increase in the number of moons divides the inner and outer planets.
c. the inner planets have cooler temperatures than the outer planets.
d. an additional planet found outside the main orbit is the dividing line.

The correct answer is option(A).

Explanation

Inner planets are those planets which are closer to sun, smaller and rockier. For example: Mercury, Earth, Venus and Mars

Outer planets are those planet which far away from the sun with bigger size and are made up of gases.For example: Jupiter, Saturn etc.

There is an asteroids belt present after Mars;s orbit which distinguishes inner planets from outer planets. It is a circumstellar (ring shaped) disc in a solar system composed of small rocks called asteroids.

Hence, the correct answer is option (A).

the answer would be c

russian is not my first language, so i'm afraid i can't write out an answer in russian, but hopefully you can find a way to do so. here's my best translation of the problem: you're given a plot of a particle's position in one-dimensional space over time, and you're asked to find either the total distance traveled by the particle after 6 seconds had elapsed, or the total displacement of the particle after 6 seconds.

if you want the total distance traveled, you would first need to determine the particle's velocity as a function of time, then integrate that over the 6-second interval. we know the position function is quadratic with roots at 0 and 6, so we have

where is unknown. because the position is parabolic, there is symmetry about the midpoint at , and we know that

so that the position function is

which means the velocity is

then the total distance traveled is

so the total distance traveled is 20 m.

on the other hand, if you want to find displacement: the particle starts at and ends at , so its displacement is 0.