A warm cup of coffe gradually cools down to room temperature. Treating the coffee as the system, determine the sign of Q during the cooling process. Solution Since the warm cup is having temp at the initial state due to gradual cooling temp of the body is reduced which shows that heat is lost to surroundings. Since heat is lost is lost to surroundings then Q is considered to be negative..

1. A warm cup of coffe gradually cools down to room temperature. Treating the coffee as the
system, determine the sign of Q during the cooling process.
Solution
Since the warm cup is having temp at the initial state due to gradual cooling temp of the body is
reduced which shows that heat is lost to surroundings. Since heat is lost is lost to surroundings
then Q is considered to be negative.