A contraption is designed by a student so that she can open the door while she sits at the desk. She can pull the cord which goes over the pulley and is tied to the door knob. The coordinates of the door knob K and the pulley P are provided with respect to the origin, O and the axes.
A minimum of 2 Nm moments is needed to open the door about its hinge AB. With what force must the cord be pulled to open the door?

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B (0, 2, 3) P(3, 1, 3) K (0, 3, 1.5) y. A (0, 2, 0)