Problem 4-53/4-54/4-55/ Engineering Mechanics Materials.

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4–53. Each of the three A-36 steel wires has the same diameter. Determine the force in each wire needed to support the 200-kg load.

4–54. The 200-kg load is suspended from three A-36 steel wires each having a diameter of 4 mm. If wire BD has a length of 800.25 mm before the load is applied, determine the average normal stress developed in each wire.

4–55. The three suspender bars are made of A992 steel and have equal cross-sectional areas of 450mm2. Determine the average normal stress in each bar if the rigid beam is
subjected to the loading shown.
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What is difference 53 and 54
I don't understand no.53 BD change to no.54 BD+0.25

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