7. A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle.
(b) If a 700-N man holds the rifle firmly against his
shoulder, find the recoil speed of man and rifle.

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.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

This is the number of complete movements of a wave per second.