6. [4-65] Determine the magnitude of the horizontal force F = -Fi acting on the handle of the wrench so that this force produces a component of the moment along the OA axis (z-axis) of the pipe assembly of M₂ = {4k}N-m. Both the wrench and the pipe assembly, OABC, lie in the y-z plane. (Suggestion: Use a scalar analysis.) Z B Ans: F5.66 N 0.8 m 0.6 m 135° 0.2 m