The steel roll shown weighs 2800 lb, has a centroidal radius of gyration of 6 in., and is...

The steel roll shown weighs 2800 lb, has a centroidal radius of gyration of 6 in., and is lifted by two cables looped around its shaft. Knowing that at the instant shown the acceleration of the roll is 6 in./s2 downward and that for each cable TA = 680 lb, determine (a) the corresponding value of the tension TB, (b) the angular acceleration of the roll.

Fig. P16.51