JAMB - Physics (1982 - No. 13)
250g of lead at 170oC is dropped into 100g of water at 0oC. If the final temperature is 12oC, the specific heat of lead is (specific heat of water is 4,200J/kgoC)
39.5J/kgoC
50.4J/kgoC
127.6J/kgoC
154.6J/kgoC
173.4J/kgoC
解释
Heat lost = heat gained
0.25 x C1 x (170 - 12) = 0.1 x 4200 x (12 - 0)
C1 = 127.6J/kgoC
0.25 x C1 x (170 - 12) = 0.1 x 4200 x (12 - 0)
C1 = 127.6J/kgoC