Problem 3: Inputs: 065 (measured from vertical) L = 0.75 in (measured horizontally) L = 8 in T= 110 lbh A torque of T is required to loosen the bolt at A. What force P must be exerted to loosen the bolt. L P Comments: Notice no coordinate system is given. This is how problems in the real world are. You decide what your frame of reference will be. Can you use vectors here? Sure, but why? This is another one of those problems that's crazy easy if you can see the moment arms. Hint: You are only interested in moments about the axis of the bolt. Therefore, look for separation distances between the axis of the bolt and the axis of the force. For reference, when I say "axis of force," it's not technically correct. Really we should be talking about the "line of action of the force." I'm just trying to simplify things so you can look for separation distances between two axes. Watch your sines/cosines here. It's infuriating to think you're struggling with the concepts only to realize you're not getting the same answer as your buddy because of a sine/cosine swap. It's even more infuriating to miss those points on an exam. So figure it out now. Come up with a mental cue to trigger your mind if needed. For me, if I see angles measured from vertical I immediately know I need to watch my trig.