Chapter 6, Problem 53TS

When $2\text{ kg}$ of $40°\text{C}$ iron nails are submerged in $2\text{ kg}$ of $20°\text{C}$ water, show that the final temperature of the water will nearly be $22°\text{C}$. (The specific heat capacity c of water is $4190\text{J}/\text{kg°C}$ and of iron is $450\text{J}/\text{kg°C}$).