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I don't know how to do this really hard last question in the attached file.
I kinda need help especially for 2) 3) and 4)
for 2) I know that t = | r x f | <- cross product, So you can find a general formula for the position vector R, in terms of alpha and theta, but then what do I use for the F vector?
and for 3) and 4) I just have no idea -.-