A sphere placed in a Cartesian frame at the position (1.5 m, 2.5 m, 0) is subject to a force F= -3 î N. Find the torque produced by F about the point O (0, 0, 0).

• A. -4.5 î N•m
• B. 4.0 ĵ N•m
• C. 7.5 ĵ N•m
• D. 7.5 k̂ N•m

Answer: (D)