Which would be most useful in trying to obtain procedural information to replicate an experiment previously published?

1.dictionary
2.encyclopidia
3.internet search engine
4.peer-reviewed journal article

Answer;

4. Peer-reviewed Journal Article

Explanation;

-Peer-reviewed journals - Articles are written by experts and are reviewed by several other experts in the field before the article is published in the journal in order to insure the article's quality.

-Peer review means that a board of scholarly reviewers in the subject area of the journal, review materials they publish for quality of research and adherence to editorial standards of the journal, before articles are accepted for publication.

what type of charge does it have? negative

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.