Questions Directory: Sounds with frequencies greater than 20 kHz are called to Spaceship 1 and spaceship 2 have equal masses of 300 kg Spaceship 1 has a speed of 0 m s and spaceship 2 has a speed of 6 m s what is the magnitude of their combined momentum to These waves created by the earthquake are the strongest at the epicenter to The site where lipid components of the cell membrane are assembled and where proteins are modified