Newton's law of cooling with the average-temperature method: time or temperature over an interval

1. A.
   72 s
2. B.
   66 s
3. C.
   60 s
4. D.
   84 s

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1. A.
   6 min
2. B.
   4 min
3. C.
   3 min
4. D.
   2 min

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1. A.
   $\frac{9\theta}{4}$
2. B.
   $\frac{2\theta}{5}$
3. C.
   $\frac{5\theta}{3}$
4. D.
   $\frac{7\theta}{3}$

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1. A.
   $24^{\circ}C$
2. B.
   $28^{\circ}C$
3. C.
   $18^{\circ}C$
4. D.
   $32^{\circ}C$

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1. A.
   48 s
2. B.
   42 s
3. C.
   50 s
4. D.
   45 s

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1. A.
   7.5 min
2. B.
   10 min
3. C.
   12.5 min
4. D.
   15.0 min

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1. A.
   $3.5$
2. B.
   $10$
3. C.
   $11$
4. D.
   $7$

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1. A.
   $\dfrac{2\theta}{3}$
2. B.
   $\dfrac{7\theta}{3}$
3. C.
   $\dfrac{5\theta}{3}$
4. D.
   $\dfrac{8\theta}{3}$

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1. A.
   $0.5$ minute
2. B.
   $1.4$ minute
3. C.
   $1$ minute
4. D.
   $2$ minute

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1. A.
   $\dfrac{9}{5}\theta$
2. B.
   $\dfrac{7}{4}\theta$
3. C.
   $\dfrac{3}{2}\theta$
4. D.
   $\dfrac{4}{3}\theta$

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