Assume that the roller coaster track has no friction, which means there's no heat transfer from the track to the surroundings. How does lack of friction affect the energy of the roller coaster
System?

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm