using System; using L=Science.Physics.GeneralPhysics; namespace Serway.Chapter08 { /// /// Example05: The Spring-Loaded Popgun /// The launching mechanism of a toy gun consists of spring /// of unknown spring constant (Fig.8.9a). When the spring is /// compressed 0.120 m, the gun, when fired vertically, is /// able to launch a 35.0 g projectile to a maximum height /// of 20.0 m above the position of the projectile before firing. /// (A) Neglecting all resistive forces, determine the /// spring constant. /// k = 953 N/m /// (B) Find the speed of the projectile as it moves /// through the equilibrium in Figure 8.9b. /// v_b = 19.7 m/s /// public class Example05 { public Example05() { } private string result; public string Result { get{return result;} } public void Compute() { L.Mass m = new L.Mass(); m.kg = 0.035; L.Length x = new L.Length(); x.m = 0.12; L.Length h = new L.Length(); h.m = 20.0; double k = 2.0*m.kg* L.Constant.AccelerationOfGravity*h.m/x.m/x.m; result += Convert.ToString(k); L.KineticEnergy ke = new L.KineticEnergy(); ke.J = 0.5*k*x.m*x.m; L.Velocity v = new L.Velocity(m,ke); result += "\r\n"+v.ToString(); } } } //952.777777777778 //19.7989898732233 +/- 0 i +0 +/- 0 j +0 +/- 0 k (m/s)