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What should the power status of a circuit be when measuring resistance with an ohmmeter?

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

How to tell if a molecule is polar or nonpolar with electronegativity