Reply To: jeffrey de rycke

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#1860 Score: 0

Looking at the other answers I now realize I read the question wrong.

alpha>0 just as in the clip (and last part of my answer), theta=0 (+k*pi) or dumbell parallel to z-axis
alpha0= -> doesn’t matter (formula is always 0)
alpha<0 theta = pi/2 (+k*pi) or dumbell in xy-plane.