Q. Thermal energy is supplied to a melting solid at a constant rate of 2000 W. Calculate the mass of the solid changed to liquid in 2.0 minutes. Assume that the specific latent heat of fusion of the solid is 95 000 J kg-1 and that heat exchange with the surroundings may be neglected. I was doing my physics homework just fine until I came to this question. I have NO idea how to do this :s Please help! Note: I'm really bad physics. Like REALLY bad and I've just started to get the hang of it a little.