Normal Stress: 5 The tensile force T is equal to the weight of the wooden box W = 300 lbs. The weight W is transmitted to the rope through 4 cables that are inclined at an angle of 30o to the horizontal plane. (a) If all 4 cables have a diameter of 1/4 inch, find the stress in each cable. (b) If the cables have an ultimate stress U = 60ksi , find the safety factor the cables are operating at. (c) What would it mean if the safety factor was found to be less than unity