A cup with mass 4.1 kg has been sitting in a room with a temperature of 23 oC for a long time. A person pours 916 grams of water with a temperature of 47 oC into the cup. After a while, the cup and water reach thermal equilibrium with a temperature of 40 oC.
Calculate the specific heat of the cup if the specific heat of water is 4186 J/kgoC.