IB Physics SL B.1.7 Thermal transfer direction

Decide whether thermal energy flows or not by comparing temperatures and identifying when a system has reached thermal equilibrium.

Exam points

use the temperature difference to decide net transfer direction, not mass or thermal capacity
state that readings are taken after waiting so the system reaches thermal equilibrium and temperature is constant

[Maximum number: 3]

This question is in two parts. Part 1 is about the motion of a ship. Part 2 is about melting ice.

The whole of the experiment in (f)(i) and (f)(ii) is repeated with a container of negligible mass that is not isolated from the surroundings. The temperature of the surroundings is $18^{\circ} \mathrm{C}$ . Comment on the final temperature of the water in (f)(ii).

ice/water spends more time below $18^{\circ} \mathrm{C}$ ;
so net energy transfer is in to the system;
so final water temperature is higher;
or
ice/water spends less time below $18^{\circ} \mathrm{C}$ ;
so net energy transfer is out of the system;
so final water temperature is lower;
5. Part 1 Oscillation of a mass

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B.1.7—Thermal transfer direction question 1