In an electric furnace with a power of 100 kW, a steel ingot was completely melted in 2.3 hours.

In an electric furnace with a power of 100 kW, a steel ingot was completely melted in 2.3 hours. What is the mass of the ingot if it is known that the steel had to be heated to 1500 ° C before melting began? Neglect energy loss.

In order for us to be able to melt the ingot, we need to give it the energy to heat it to the melting point. We also need to know the energy for the melting process of this ingot. We have:
A = Q Q = cm (t2-t1) lm
A = Pt
Substitute Q and A into the equation and m. We have:
m = Pt / c (t2 – t1) lm = 1000 kg.