If you were an engineer designing a new artificial biosphere,

A-what approach would you use?
B-How could
your design attempt to avoid the problems faced by Biosphere 2?
C- Can you find
any papers published by current projects using this facility to support your
explanation with evidence? ( BONUS )

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?