Determine the rate of change h. a of the angular momentum hd of the 3-lb rod cde, assuming that at the instant considered the assembly has an angular velocity ω = (12 rad/s)i and an angular acceleration α = (96 rad/s2)i. the rate of change h. a of the angular momentum hd of the assembly is ( lb·ft)i + ( lb·ft)j + ( lb·ft)k.