A mobile is made of identical objects of mass m suspended so that the lowest row has one object,the row above two objects,and the row above three objects.All the strings are at 45° angles.What is the average tension in the strings connecting the highest row to the ceiling? 
Definitions:
Shoulder Joint
A ball-and-socket joint that connects the upper arm to the torso, allowing a wide range of arm movements.
Retraction
Movement in the posterior direction.
Protraction
Movement forward or in the anterior direction.
Temporomandibular Joint
The hinge joint that connects the lower jaw (mandible) to the temporal bone of the skull, which is in front of the ear on each side of the head.
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