Which two energy sources use mechanical energy to produce electricity?
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Describe the path of a ray that approaches a mirror parallel to the principal axis.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.