using System; using L=Science.Physics.GeneralPhysics; namespace Serway.Chapter22 { /// /// Example02: Freezing Water /// A certain refrigerator has a COP of 5.00. When the /// refrigerator is running, its power input is 500 W. /// A sample of water of mass 500 g and temperature 20.0 C /// is placed in the freezer compartment. How long does /// it take to freeze the water to ice at 0 C? /// Assume that all other parts of the refrigerator stay at /// the same temperature and there is no leakage of energy /// from the exterior, so that the operation of the refrigerator /// results only in energy being extracted from the water. /// \Delta t = 83.3 s /// public class Example02 { public Example02() { } private string result; public string Result { get{return result;} } public void Compute() { L.Mass m = new L.Mass(); m.kg = 0.5; L.Temperature t = new L.Temperature(); t.C = 20.0; L.SpecificHeat c = new L.SpecificHeat(); c.JPERkgPERCelsius = 4186.0; L.LatentHeat Lw = new L.LatentHeat(); Lw.JPERkg = 3.33E5; L.Heat Q = new L.Heat(); Q.J = m.kg*(c.JPERkgPERCelsius*t.C+Lw.JPERkg); L.Work W = new L.Work(); W.J = Q.J / 5.00; L.Power p = new L.Power(); p.W = 500.0; L.Time time = new L.Time(); time.s = W.J/p.W; result+=time.ToString(); } } } //83.344 +/- 0 (s)