Question

If 10 grams of water at 50°C is mixed with 30 grams at
40°C, what will be the final
temperature?​

Answer 1

since material mixed are both water hence specific heat will be same and the final temperature will be the weighted arithmetic mean of given temperatures

final temperature = (10*50 + 30*40)/(10+30)

= (500 + 1200)/40

= 1700/40

= 42.5°