Which of the following are true about centripetal force? check all that apply. a. without centripetal force, an object cannot accelerate. b. friction can be a centripetal force, such as when it keeps a car on the road going around a curve. c. gravity can be a centripetal force, such as when it pulls a satellite in its orbit. d. it's also called an outward force.

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.