Heat Transfer and Thermal Equilibrium Worksheet

Question 1

A 55 °C sample is placed in contact with a 20 °C sample. What is the direction of net heat transfer at first?

1. From the 20 °C sample to the 55 °C sample
2. From the 55 °C sample to the 20 °C sample
3. Equally in both directions so neither changes
4. No transfer can occur while the temperatures differ

Question 2

Two objects in contact have reached the same temperature. Explain what happens to net heat transfer between them.

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Question 3

Two objects have different masses and reach thermal equilibrium together. Which quantity must be the same for both?

1. Mass
2. Specific heat capacity
3. Temperature
4. Total internal energy

Question 4

In an insulated model, a hot sample loses 240 J of heat to a cooler sample. Explain how much heat the cooler sample gains.

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Question 5

At which listed time do the readings first show the same temperature?

1. 0 min
2. 1 min
3. 2 min
4. 4 min

Question 6

Calculate the temperature change of the solid and of the bath from 0 to 4 minutes. Include the signs.

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Question 7

At 2 minutes, which direction is net heat transfer still expected to occur?

1. From the bath to the solid
2. From the solid to the bath
3. From the room to both samples
4. No net transfer occurs.

Question 8

Explain why the solid and bath can have unequal temperature changes even when the heat lost by one equals the heat gained by the other.

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