You observe a liquid turning to gas at 135 degrees celsius. you are observing the boiling point freezing point melting point triple point

What is the single most important equation in all of physics?

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?