$\overline{)\begin{array}{rcl}{\mathbf{\tau}}& {\mathbf{=}}& \mathbf{F}\mathbf{\xb7}\mathbf{r}\mathbf{}\mathbf{s}\mathbf{i}\mathbf{n}\mathbf{\theta}\end{array}}$

$\mathit{r}\mathbf{=}\frac{\mathbf{D}}{\mathbf{2}}\mathbf{=}\frac{\mathbf{4}\mathbf{.}\mathbf{0}\overline{)\mathbf{cm}}}{\mathbf{2}}\mathbf{\times}\frac{\mathbf{1}\mathbf{m}}{\mathbf{100}\mathbf{}\overline{)\mathbf{cm}}}\mathbf{=}\mathbf{0}\mathbf{.}\mathbf{02}\mathbf{}\mathbf{m}$

Let clockwise be positive and counter-clockwise negative.

In the figure (Figure 1), what is the net torque about the axle? Express your answer to two significant figures and include the appropriate units.

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