Question: When an object is removed from a furnace and placed in an environment with a constant temperature of 90F, its core temperature is 1500F. Five

When an object is removed from a furnace and placed in an environment with a constant temperature of 90°F, its core temperature is 1500°F. Five hours later, the core temperature is 390°F. Explain why there must exist a time in the interval when the temperature is decreasing at a rate of 222°F per hour.

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