τ=Iα\tau=\mathrm{I} \alphaτ=Iα
τ=1α\tau=\frac{1}{\alpha}τ=α1
τ=α2I\tau=\frac{\alpha^{2}}{I}τ=Iα2
τ=I3α\tau=\frac{\mathrm{I}^{3}}{\alpha}τ=αI3