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Oh, clumsy of me ", she said." but never mind, if look into the bag for the one
that is left, you will be able to tell which pebble I picked
Oh, clumsy of me ", she said." but never mind, if look into the bag for the one
that is left, you will be able to tell which pebble I picked
Moral of the story: Always think of extreme cases when doing these puzzles. They are usually the key.
If we let C denote the original coffee temperature and M the milk temperature, we see that
Assume that the difference in specific heats of coffee and milk are negligible, so that if you add milk at temperature M to coffee
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Assume that the coffee cools at a rate proportional to the difference in temperature, and that the amount of milk is sufficiently small that the constant of proportinality is not changed when you add the milk.
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