Solved: After a mass m is attached to a spring, it

Chapter 1, Problem 1.1.130

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After a mass m is attached to a spring, it stretches it s units and then hangs at rest in the equilibrium position as shown in Figure 1.3.18(b). After the spring/mass FIGURE 1.3.18 Spring/mass system in unstretched spring equilibrium position m x = 0 x(t) > 0 x(t) system has been set in motion, let x(t) denote the directed distance of the mass beyond the equilibrium position. As indicated in Figure 1.3.17(c), assume that the downward direction is positive, that the motion takes place in a vertical straight line through the center of gravity of the mass, and that the only forces acting on the system are the weight of the mass and the restoring force of the stretched spring. Use Hookes law: The restoring force of a spring is proportional to its total elongation. Determine a differential equation for the displacement x(t) at time t 0.

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