using System; using L=Science.Physics.GeneralPhysics; namespace Serway.Chapter08 { /// /// Example06: Crate Sliding Down a Ramp /// A 3.00 kg crate slides down a ramp. the ramp is 1.00m /// in length and inclined at an angle of 30.0^{\circle}, /// as shown in Figure 8.11. The crate starts from rest /// at the top, experiences a constant friction force /// of magnitude 5.00 N, and continues to move a short /// distance on the horizontal floor after it leaves the ramp. /// Use energy methods to determine the speed of the crate /// at the bottom of the ramp. /// v_f = 2.54 m/s /// public class Example06 { public Example06() { } private string result; public string Result { get{return result;} } public void Compute() { L.Length h = new L.Length(); h.m = 1.0*Math.Sin(30.0*Math.PI/180.0); L.Mass m = new L.Mass(); m.kg = 3.0; L.PotentialEnergy Ui = new L.PotentialEnergy(); Ui.J = m.kg*L.Constant.AccelerationOfGravity*h.m; L.Work[] W = new L.Work[2]; W[0] = new L.Work(); W[0].J = Ui.J; W[1] = new L.Work(); W[1].J = -5.0*1.0; L.KineticEnergy Ki = new L.KineticEnergy(); Ki.J = 0.0; L.KineticEnergy Kf = new L.KineticEnergy(); Kf.VariableQ = true; L.FundamentalLaw.WorkEnergyTheorem(Ki,W,Kf); L.Velocity vf = new L.Velocity(m,Kf); result += vf.ToString(); } } } //2.54296414970142 +/- 0 i +0 +/- 0 j +0 +/- 0 k (m/s)