using System; using L=Science.Physics.GeneralPhysics; namespace Serway.Chapter09 { /// /// Example18: The Exploding Rocket /// A rocket is fired vertically upward. At the instant /// it reaches an altitude of 1000 m and a speed of 300 m/s, /// it explodes into three fragments having equal mass. /// One fragment continues to move upward with a speed /// of 450 m/s following the explosion. The second fragment /// has a speed of 240 m/s and is moving east right after /// the explosion. What is the velocity of the third /// fragment right after the explosion? /// v_f = -240 i + 450 j m/s /// public class Example18 { public Example18() { } private string result; public string Result { get{return result;} } public void Compute() { L.Mass M = new L.Mass(); M.kg = 10.0; L.Mass m = new L.Mass(); m.kg = M.kg/3.0; L.Velocity[] v = new L.Velocity[4]; v[0] = new L.Velocity(); v[0].Y = 300.0; v[1] = new L.Velocity(); v[1].Y = 450.0; v[2] = new L.Velocity(); v[2].X = 240.0; v[3] = new L.Velocity(); v[3].XVariableQ = true; v[3].YVariableQ = true; L.Momentum pi = new L.Momentum(M,v[0]); L.Momentum[] pf = new L.Momentum[3]; pf[0] = new L.Momentum(m,v[1]); pf[1] = new L.Momentum(m,v[2]); pf[2] = new L.Momentum(m,v[3]); L.FundamentalLaw.MomentumConservation(pi,pf); result+=Convert.ToString(pf[2].X/m.kg)+"\r\n"; result+=Convert.ToString(pf[2].Y/m.kg)+"\r\n"; } } } //-240 //450