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Which equation expresses Newton's law of cooling for body temperature θ and surroundings θ0?
Adθ/dt = k(θ + θ0)
Bdθ/dt = -kθ0
Cdθ/dt = -k(θ - θ0)
Ddθ/dt = kθθ0
Answer & Solution
Correct answer: C. dθ/dt = -k(θ - θ0)
The cooling rate is proportional to the temperature difference θ - θ0, with a negative sign as the body cools.
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