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File Assignment2 - ASSIGNMENT NO.2 Assignment problem#1(20...

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ASSIGNMENT NO.2 Assignment problem #1 (20 out of 100) A bar ABC of length L consists of two parts of equal lengths but different diameters. Segment AB has diameter d 1 =100mm and segment BC has diameter d 2 =60mm. Both segments have length L/ 2=0.6m. A longitudinal hole of diameter d is drilled through segment AB for one-half of its length (distance L/ 4=0.3m). The bar is made of plastic having modulus of elasticity E =4.0GPa. Compressive loads P =110kN act at the ends of the bar. If the shortening of the bar is limited to 8mm, what is the maximum allowable diameter d max of the hole? Assignment problem #2 (20 out of 100) A uniform bar AB of weight W = 125N is supported by two springs, as shown in the figure. The spring on the left has stiffness 1 300 k = N/m and the natural length L 1 =250mm. The corresponding quantities for the spring on the right are 2 400 k = N/m and L 2 =200mm. The distance between the springs is L =350mm, and the spring on the right is suspended from a support that is distance h =80mm
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