You want to use an electric stove to heat some water. You place a pot filled with 1500 g of water at room temperature (25 C) on the stove (the charaterisitics of the pot can be neglected). In order to heat the water faster, you also use an electric beater, which does 120 J of work per second. After 9 minutes the water starts boiling (100 C). Specific heat capacity of water is 4.2 J/(g*C).

By how much has the energy of the surroundings changed?