Five molecules have speeds of 2. 8, 3. 2, 5. 8, 7. 3, and 7. 4 m/s. Their root-mean-square speed is closest to:.

meme (meem)-an element of a culture or system of behavior that may be considered to be passed from one individual to another by nongenetic means, especially imitation. ( lol)

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go on time and make sure you have at least 2 pens and pencils. read the questions carefully

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i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!