How long must you wait (in half-lives) for a radioactive sample to drop to 2.10 % of its original activity?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Acombination reaction is when two or more combine to form one product. a decomposition reaction is when a substance breaks down into two or more simpler substances in a chemical reaction.

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