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- Determine the second moment of area of this cross-section about the its centroid (the x’ axis), Ix’.
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- An engineer determines that a 60 cm long rod of 1045 HR grade of steel will be subjected to a tension of 20kN. The following two designs requirements must be met: must remain below 145MPa and the rod must stretch less than 0.125mm. Determine an appropriate value for the rod's diameter to meet these two requirements. Round to the nearest milimeter(SI Units) In a tensile test, the starting gage length = 100.0 mm and the cross-sectional area = 150 mm2. During testing, the following force and gage length data are collected: (1) 17,790 N at 100.2 mm, (2) 23,040 N at 103.5 mm, (3) 27,370 N at 110.5 mm, (4) 28,910 N at 122.0 mm, (5) 27,480 N at 130.0 mm, and (6) 20,460 N at 135.1 mm. The final data point (6) occurred immediately prior to failure. Yielding occurred at a load of 19,390 N (0.2% offset value), and the maximum load (4) was 28,960 N. (a) Plot the engineering stress strain curve. Determine (b) yield strength, (c) modulus of elasticity, (d) tensile strength, and (e) percent elongation.Suppose that the length of the steel bar is measured by a number of different observers and following set of 11 measurements is recorded as set A (units mm): 398, 420, 394, 416, 404, 408, 400, 420, 396, 413, 330. Next the measurements are taken using different ruler to produce measurement set B: 409, 406, 402, 407, 405, 404, 407, 404, 407, 407, 408. It can be shown that the mean values set A and B are 409 and 406 respectively. Which of the two measurement sets A and B, and the corresponding mean value, should have most confidence in? why? Text
- 5) Chapter 3: Problem 3.2: (SI Units) During a tensile test, the starting gage length=100.0 mm and the cross-sectional area =150 mm2. During testing, the following force and gage length data are collected: (1) 17,790 N at 100.2 mm, (2) 23,040 N at 103.5 mm, (3) 27,370 N at 110.5 mm, (4) 28,910 N at 122.0 mm, (5) 27,400 N at 130.0 mm, and (6) 20,460 N at 135.1 mm. The final data point (6) occurred immediately prior to failure. Yielding occurred at a load of 19,390 N (0.2% offset value), and the maximum load (4) was 28,960 N. (a) Plot the engineering stress strain curve. Determine (b) yield strength, (c) modulus of elasticity, (d) tensile strength, and (e) percent elongation.What is the worst-case distance between the bottom surface of the slot and the bottom surface of the part in the drawing below? B 4.000-4.020 1.475 O 1.030 2.950 B 4.00 O 1.450 O 1.500 1.000-1.010 .010M ABM 2.00 ACalculate to the correct number of significant figures.(85.3-21.489)/0.0059
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