i understood everything efim hello fixed block - how is it? hello, i have answered this question.emember that a moving block gives a gain in effort to a fixed one. no, what does it give for some reason, is it needed or in general, like a useless thing, a fixed block does not give a gain in strength, but only changes its direction quote from a ninth grade physics textbook correct answer to this question. no, you can look at the screen. if someone does not remember what a fixed block looks like, then it looks like this. the third question, is it true that all salts are non-molecular substances ? i'm not very good. i remember this topic in chemistry, someone can justify their answer to the question. thank you, then okay, andrey, hello, how did you answer? no for what reasons i, like you, do not remember this topic, but something told me so , my soul, that it would be no, good since the soul prompted, we will count on her, of course, xenia hello, how did you answer? yes, as far as salts are still crystals good. replied. hello good afternoon, i answered no, because, unfortunately, i do