In the NASCAR video you learned that race teams try to reduce drag by adding removing all objects that allow air to flow over the car instead of
going through the car. The negative trade off of forcing the air over the car
is that it creates more
to build up in the engine.

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.