I was given a homeowork where i need to explain why did water cool down slower when it had a coat of oil on top of it. We had a cup with just water and a cup with same amount of water but some oil on top. I know the starting temperatures and the temperatures after 10 min in the cups, i know the volume of water and oil, i know the size of the cups, i know the mass of the mixture. But i don't know how to explain this problem with formulas. I would really like to know where to start, what to calculate. Thank you.
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