Symmetrical Parabolic Cable | Axial Stress and Largest Additional W

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The water supply pipe shown is suspended from a cable using a series of close and equal spaced
hangers. The length of the pipe is supported by the cable is 40 m. The total weight of the pipe filled with water is 20 KN/m.

What is the maximum sag (in meters) at the lowest point of the cable which occurs at mid length if the allowable tensile load in the cable is 3000 KN?
A. 3.88
B. 2.54
C. 3.23
D. 1.35

If the sag of the cable at mid length is 3.5 m and the allowable tensile load in the cable is 1800 KN, how much additional load can the cable carry in kN/m?
A. 16.35
B. 8.19
C. 12.38
D. 9.73

If the sag of the cable at mid length is 4 m. Find the maximum axial stress (MPa) if the cable diameter is 75 mm.
A. 291
B. 244
C. 354
D. 462