Afreezer compartment is covered with a 2-mm thick layer of frost at the time ii malfunctions. if the compartment is in ambient air at 20 degree c and a coefficient of h = 2 w/m2 k characterizes heat transfer by natural convection from the exposed surface of the layer, estimate the time required to completely melt the frost the frost may be assumed to have a mass density of 700 kg/m3 and a latent heat of fusion of 334 kj/kg.