- #1
Yingnan Xu
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Hi guys, so in Arnold's mathematical methods of classical mechanics p43, he defined the moment M_z, or L_z, the angular momentum, relative to the z axis of vector F applied at the point r is the projection onto the z axis of the moment of the vector F relative to some point on this axis, M_z=(e_z,[r,F]), where this square bracket is cross product. I think this should be the time derivative of M_z otherwise the unit is not consistent. Or he actually means the moment of M_z is the torque?