College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 3

A 0.250-kg coffee cup at 20 °C is filled with 0.250 kg of brewed coffee at 100 °C. Tire cup and the coffee come to thermal equilibrium at 80 °C. If no heat is lost to the environment, what is the specific heat of the cup material [ Hint : Consider the coffee essentially to be water.]