# 3. A20-t-tall thin hollow tapered tube of a uniform wall thickness of j in. is used for a light p...

###### Question:

3. A20-t-tall thin hollow tapered tube of a uniform wall thickness of j in. is used for a light pole in a parking lot,as shown in Figure P3 The mean diameter at the bottom is 8 in, and at the top it is 2 in. The weight of the lights on top of the pole is 80 Ib. The pole is made of aluminum alloy with a specific weight of O.1 lbin, a modulus of elasticity E 11,000 ksi, and a shear modulus of rigidity G 4000 ksi. Determine (a) the maximum axial stress; (b) the contraction of the pole. (Hint: Approximate the cross-sectional area of the thin-walled tube by the product of circumference Tapered pole Figure P3.

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