You are driving at 90 km/h. how many meters are you covering per second?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?

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.