Physics

Problem

A well-insulated calorimeter contains a metal sphere initially at

90^\circ\text{C}

suspended in water initially at

20^\circ\text{C}

. The temperatures of the sphere and the water are recorded every two minutes after contact begins, as shown. Time (min) | 0 | 2 | 4 | 6 | 8 Sphere Temp (

^\circ

C) | 90 | 60 | 45 | 38 | 34 Water Temp (

^\circ

C) | 20 | 28 | 34 | 36 | 34 Based on the data, at which recorded time are the sphere and the water MOST likely to be in thermal equilibrium? a)

6\ \text{min}

4\ \text{min}

8\ \text{min}

2\ \text{min}

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