Two ice skaters, with masses of 45 kg and 65 kg respectively, are initial at rest and facing each other over a surface of ice. They push off from each other and the 45 kg skater moves away with a velocity of
6.0 m/s. Find the final velocity of the 65 kg skater.

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

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 calculate voltage drop in a series circuit