A well-insulated calorimeter contains a metal sphere initially at suspended in water…
PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
A well-insulated calorimeter contains a metal sphere initially at 90∘C suspended in water initially at 20∘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 (∘C) | 90 | 60 | 45 | 38 | 34
Water Temp (∘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) 6min
(b) 4min
(c) 8min
(d) 2min