A bolt whose shank lies on the y axis is to be loosened. In Fig. P4.15(a), an open-end w...

A bolt whose shank lies on the y axis is to be loosened. In Fig. P4.15(a), an open-end wrench is used where the handle lies along the x axis. In Fig. P4.15(b), a ratchet wrench is used where the handle is parallel to the x axis. If the force applied to the handle of the wrench acts in the -z direction, determine the moment of this force about point O for each wrench. Speculate on which of the wrenches will be more effective in loosening the bolt. Explain.