申論題

4.20pts Two uniform rods AB and CE, each of mass 1.5 kg and length 600 mm, are welded to each other at their midpoints. Knowing that this assembly has an angular velocity of constant magnitude ω = 12 rad/s, determine the magnitude and direction of the angular momentumH_D = of the assembly about D. Write your final answer in the form: ( H_D=_______ ). (In vector form)