A cooking vessel on a slow burner contains 10.0 kg ofwater and an unknown mass of ice in equilibrium at0C at time t 5 0. The temperature of the mixture ismeasured at various times, and the result is plotted inFigure P20.79. During the first 50.0 min, the mixtureremains at 0C. From 50.0 min to 60.0 min, the temperatureincreases to 2.00C. Ignoring the heat capacityof the vessel, determine the initial mass of the ice.012320 40 60T (C)t (min)0Figure P20.79

Notes for Week 2 Physics 1 Instantaneous Velocity: Examples: 1. A jet engine moves along an experimental track (which we call the x axis). We will treat the engine as if it were a particle. Its position as a function of time is given by the 2 2 equation x = At + B, where A = 2.10m/s and B = 2.80m. (a) Determine the average velocity during this time interval. (b) Determine the displacement of the engine during the time interval from t1= 3.00s to t2= 5.00s. (c) Determine the magnitude of the instantaneous velocity at t = 5.00s. Solution: (a) In physics, the first thing you do when you have a question is see what the question is asking yo