Me with this problem
this problem is about using the singularity functions in mechanics of materials

Fluids at rest possess no flow energy. a)- true b)- false

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

Wiy doeres rere okhn a pump whon working betwon the same pressure range?