What are three reasons why nebulae contribute more to stellar formation than other regions of the universe? a. they are rich in hydrogen and helium. b. they have an unlimited supply of hydrogen. c. they are far away from black holes. d. they are dense and hot. e. they have a strong gravitational pull.

Options A, D and E.

Explanation:

Nebulae are region where stars and planets take birth. These are molecular clouds of dust and gas. These clouds are rich in Hydrogen and Helium. The dense and hot cloud collapses under its own weight. It then condenses and forms a disk which stars rotating. The central core forms the star and planets form from the rest of the material.

Hence, option A, D and E are correct.

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.

because if the tool that you are using is not balanced it there would be false mass.