calculate the height in m of a cliff if it takes 2.25 s for a rock to hit the ground when it is thrown straight up from the cliff with the initial velocity of 8.17 m/s.

Which is not true about oxygen-17 and oxygen-18?

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

What is the freezing point of radiator fluid that is 50% antifreeze by mass? kf for water is 1.86 ∘c/m.