May someone help me In tomorrow's physical test plz

Describe the path of a ray that approaches a mirror parallel to the principal axis.

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above