Joel A. Shapiro
(Submitted on 20 Jun 2012)
An extended body subject to external forces which exert zero net force and zero total torque in the rest frame, may experience a nonzero torque in another inertial frame, and nonetheless does not rotate. Long known as the Trouton-Noble or right-angle lever paradox, there has been extensive discussion and indeed controversy, but a clear understanding comes from a suitable treatment of angular momentum and simultaneity. Comments: 1 figure, submitted to Am. Journ. of Physics
http://arxiv.org/abs/1206.4487