A train accelerates from rest and covers a distance of 600m in 20s. What is the train's speed at the end of 20s? What is the final velocity of the train after 20s?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter