Sam melts a compound and discovers that it does not conduct electricity when melted what can probably be said about the compound a. the nucleus has more protons the neutrons b. it’s elements are completely metallic in nature c. it’s elements are joined by covalent bonds d. the density of the compound is relatively low

D

Explanation: In order for a substance to conduct electricity, its molecules must be closer together in order to conduct electricity. If the substance cannot, we can conclude that it indeed has a low density.

double the distance = divide strength by 4

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.