1. The problem statement, all variables and given/known data 2. Relevant equations relevant equations listed with each question 3. The attempt at a solution a) to solve for the power output of the heater, i used the following equation: Power = Energy/time i already know that Energy = Quantity so based on this, i can solve for Q = mass(ice) x specific heat capacity (ice) x change in temperature (ice) Q = (0.25 kg) x (2100 J/kg.C) x (0 degrees - (-30 degrees) = 15 750 J Using Q, i substituted it into the equation to solve for power P = 15 750 J / 150 s (150 s is the time shown on the graph) P = 105 Watts is this correct? i need to know if this is right so i can use the power to do the next questions. this is my second attempt to part a). the only difference is the change in temperature, instead of using 0 degrees, i used -10 degrees based on the graph above: Q = (0.25 kg) x (2100 J/kg.C) x (-30 degrees - (-10 degrees) = 10 500 J Using Q, i substituted it into the equation to solve for power P = 10 500 J / 150 s P = 70 Watts i dont know if my attempts are correct, if anyone can clarify what im supposed to do here, that would be greatly appreciated. Once i figure out what to do here, i can answer the next questions and post them on this forum for clarification as well.