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

تمرين 9

An aluminum spoon at 100 °C is placed in a Styrofoam cup containing 0.200 kg of water at 20 °C. If the final equilibrium temperature is 30 °C and no heat is lost to the cup itself or the environment, what is the mass of the aluminum spoon