An open container holds ice of mass 0.570 kg at a temperature of -17.5°C. The mass of the container can be ignored. Heat is supplied to the container at the constant rate of 780 J/minute. The specific heat of ice to is 2100 J/kg•K and the heat of fusion for ice is 334 x 103 J/kg.
How much time tmelts passes before the ice starts to melt?
From the time when the heating begins, how much time t rise does it take before the temperature begins to rise above 0°C?