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Statement of a problem № 2713

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A thermos bottle contains 250 g of coffee at 90 °C. To this is added 20 g of milk at 5 °C. After equilibrium is established, what is the temperature of the liquid? Assume no heat loss to the thermos bottle.

Solution:
A thermos bottle contains 250 g of coffee at 90 °C. To this is added 20 g of mi

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