A 4.21 kg lead billet is to be melted for a casting operation. Lead has a melting point of 328°C, a specific heat capacity of 128 J/(kg·°C), and a latent heat of fusion of 23,200 J/kg. (use correct number of significant figures in your final answer.)
(a) Calculate the amount of heat required to heat the lead from a starting temperature of 21.7°C to its melting point of 328°C.
(b) Calculate the amount of heat needed to melt the lead brick once it reaches 328°C.
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