4.C6 The derrick shown supports a 2000-kg crate. It is held by a ball-and- socket joint at A and by two cables attached at D and E. Knowing that the derrick stands in a vertical plane forming an angle with the xy plane, use computational software to calculate the tension in each cable for values of > from 0 to 60 using 5 increments. Using appropriate smaller increments, determine the value of for which the tension in cable BE is maximum. E y B 3 m 3 m 3 m C DL 1.5 m 1.5 m Fig. P4.C6 2 m A 2000 kg x