Any force at all will cause an object at rest in water to begin to move, and to steadily pick up speed. It just won't accelerate as fast in water as it would if it were in air or vaccuum.
"To dislocate a shoulder you need alot and i mean alot of force"Actually no. The amount of force required to dislocate a shoulder depends on the position the shoulder is and the direction force is...
I was thinking about a standard 12oz aluminum beverage can.
Dimensions in inches: Outer diameter = 2.6, Inner diameter=2.53, thickness=0.035, height of can=4.8
I don't think Euler's buckling...