This is from a homework that's already been graded, and this is the solution:
I just want to know the reasoning behind the placement of the the 30 degree angles in the free body diagram given only the original picture.
The Attempt at a Solution
The only reasoning that I can see is that if you readjusted the axis to it's more typical x and y directions, then the force resulting from gravity acting on the object would overlap the -x axis. So by tilting the coordinate axis 30 degrees, a 30 degree angle forms between the G force and the NB force, because the G force always points directly down. Is there a better proof for this? Am I wrong in my reasoning for the placement of that angle? If it is relevant, this is for a statics class.
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