Aspacecraft with a proper length of 250 m passes by an observer on the earth. according to this observer, it takes 0.770 µs for the spacecraft to pass a fixed point. determine the speed of the spacecraft as measured by the earth-based observer.

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

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.

What is a carrier wave and how does it affect what you hear on the radio