Problem B-8-8 A mass of 20 kg is supported by a spring and damper as shown in Figure 8-28(a). The sys- tem is at rest fort <0. At 0, a mass of 2 kg is added to the 20-kg mass. The system vibrates as shown in Figure 8-28(b). Determine the spring constant k and the viscous- friction coefficient b. [Note that (0.02/0.08) x 100 = 25% maximum overshoot corre- sponds to = 0.4.] %3D

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Engineering Drawing

Technical drawing has been around since ancient times. As in the ancient Renaissance, complicated drawings were created, including Leonardo da Vinci's drawing. Modern engineering drawing, including its specific orthographic projection with scale conventions, began in Europe (France) during the early stages of Industrialization. L.T. C. Rolt also made some of Marc's drawings for its block-making machinery (in 1799) that also may have contributed significantly to British engineering technology. Since he learned the art of presenting three-dimensional(3D) items in a two-dimensional(2D) plane, as we now term mechanical drawing.