Here's another question. A hot water bottle cools down from 80 degrees Celsius to 20 degrees Celsius, releasing 756,000 joules of thermal energy. Calculate the mass of water in the hot water bottle. The specific heat capacity of water is 4,200 joules per kilogram per degree Celsius. (Hint: to answer this question, you're going to have to rearrange the equation to find the mass).

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