Giant impact theory The Moon was formed from the collision between
Earth and another Mars-sized body.
colliding planetesimbols hypothesis
The Moon was formed from collisions and combining
of planetesimals.
capture hypothesis
The Moon was locked into orbit by Earth's
gravity as it was passing by it.
accretion hypothesis
The Moon was formed from the same cloud
of material as Earth.

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?