A block of mass 2m is moving in the positive x-direction with velocity +4v. Another block of mass 3m is moving in the negative x-direction with velocity -v a. [5 pt] Find the velocity of the center of mass of the two block

Which of the following is considered to be a vector?               a.  temperature    b.  velocity    c.  time    d.  mass

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

4. now look at the green lines you created by connecting the three boiling point data points and the three melting point data points. for each of these lines, describe any trends you see. 5. locate the elements on your periodic table that you circled in green on your graph. what term or description would you use to identify these elements with respect to the periodic table? 7. using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers.