Mechanics of Materials Example: Stress

[rohitsrao]

Could you please explain why the support reactions at B aren't considered during evaluation of the force in rod BC ?! The support at B does restrict motion in the X and Y Plane which means it should support appropriate force in those directions at B. But this does render the problem statically indeterminate.

[brave]

mistake in diagram
x should be less than the total length if AC

[skinnymon]

why is t sin and not cos. dont u know the adjacent to 30 degrees is 10, not the opposite

[joshuacharlery]

Second lecture in, and that X has me confused.