31. As a 2.0-kg block travels around a 0.50-m radius circle it has an angular speed of 12 rad/s. The circle is parallel to the xy plane and is centered on the z axis, 0.75 m from the origin. The component in the xy plane of the angular momentum around the origin has a magnitude of: A. 0 B. 6.0 kg m2/s C. 9.0 kg m2/s D. 11 kg m2/s E. 14kg m2/s ans: C Section: 11-7; Difficulty: M