Normal Stress: 5a The tensile force T is equal tothe weight of the wooden box W - 300 lbs. Theweight W is transmitted to the rope through 4 cablesthat are inclined at an angle of 30° to the horizontalplane. (a) If all 4 cables have a diameter of 1/4 inch,find the stress in each cable. (b) If the cables have anultimate stress a, - 60 ksi, find the safety factor thecables are operating at. (c) What would it mean if thesafety factor was found to be less than unity?

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