- #1
bznm
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I'd like to know if the diagonal of a rectangular thin foil is an inertial principal axis.I know that if an axis isn't a symmetry axis then it isn't a principal axis. In the rectangle the diagonal isn't a symmetry axis, so it shouldn't be a principal axis. Is it correct?
So, if I consider that the angle between the rotation axis and x-axis is $\theta$ and $\vec{\omega}$ is on xy-plane, I can't understand why
##\tau_z=\omega_x \omega_y(I_{xx}-I_{yy})##
So, if I consider that the angle between the rotation axis and x-axis is $\theta$ and $\vec{\omega}$ is on xy-plane, I can't understand why
##\tau_z=\omega_x \omega_y(I_{xx}-I_{yy})##