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A force vec F = 2 hat i + 3 hat j N is a...

A force `vec F = 2 hat i + 3 hat j N` is applied to an object that is pivoted about a fixed axle aligned along the `z` coordinate axis. If the force is applied at the point `vec r = 4 hat i + 5 hat j m`, (a) the magnitude of the net torque about the `z` and (b) the direction of the torque vector `tau`.

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