A wooden block of mass M resting on a frictionless, horizontal surface is attached to a rigid rod of length and of negligible mass. Rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v hits the block and becomes embedded in it. Define is the angular momentum of the bullet–block system about a vertical axis through the pivot? (Use any symbol or variable stated above as necessary.)