A 20g piece of metal has a density of 49/cm³ is hung in a jar of oil (density of oil = 1.5g/cm³) by means of a thread what is the tension in the thread?​

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