Question 1

Which of the following best describes thermal equilibrium?

Accepted Answer

Two systems are in thermal equilibrium if they have the same temperature.

Question 2

According to the Zeroth Law of Thermodynamics, if system A is in thermal equilibrium with system C, and system B is also in thermal equilibrium with system C, what can be concluded?

Accepted Answer

System A and B are in thermal equilibrium with each other.

Question 3

What is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$T_K = T_C + 273.15$$

Question 4

A steel rail is 30.0 m long at 10°C. If the temperature increases to 40°C, and the coefficient of linear expansion for steel is $$1.2 	imes 10$$^{-5}$$ \ \mathrm{K}^{-1}$$, what is the change in length?

Accepted Answer

$$\Delta L = 1.08 \ \mathrm{cm}$$

Question 5

Which equation correctly describes the change in length due to thermal expansion?

Accepted Answer

$$\Delta L = \alpha L_0$ \Delta T$$

Question 6

If a metal plate with a hole is heated, what happens to the diameter of the hole?

Accepted Answer

The diameter of the hole increases.

Question 7

Which of the following best explains why lakes freeze from the top down rather than the bottom up?

Accepted Answer

Water expands as it cools below 4°C, causing ice to form on the surface.

Question 8

A 0.5 kg block of aluminum (specific heat $$c = 900 \ \mathrm{J/(kg \cdot K)}) is $$heated from 20°C to 50°C. How much heat is required?

Accepted Answer

$$Q = 13,500 \ \mathrm{J}$$

Question 9

Which equation gives the heat required to change the temperature of a mass $$m by$$ $$\Delta T$$?

Accepted Answer

$$Q = m c \Delta T$$

Question 10

During a phase change from solid to liquid, which of the following is true?

Accepted Answer

The temperature of the substance remains constant.

Question 11

Which formula is used to calculate the heat required for a phase change?

Accepted Answer

$$Q = m L$$

Question 12

A 100 g sample of ice at 0°C is placed in 200 g of water at 30°C. The latent heat of fusion for ice is $$334 \ \mathrm{J/g}$$ and the specific heat of water is $$4.18 \ \mathrm{J/(g \cdot K)}. $$What is the final temperature after all the ice melts?

Accepted Answer

10°C

Question 13

Which of the following is NOT a mechanism of heat transfer?

Accepted Answer

Compression

Question 14

The rate of heat transfer by conduction through a rod is given by which equation?

Accepted Answer

$$H = \frac{kA (T_H - T_C)}{L}$$

Question 15

Which law describes the heat current due to thermal radiation?

Accepted Answer

$$H = \sigma A e T^4$

Question 16

Why do expansion joints exist in bridges?

Accepted Answer

To allow for thermal expansion and prevent structural damage.

Question 17

A metal rod is prevented from expanding as it is heated. What develops in the rod?

Accepted Answer

Thermal stress

Question 18

Which of the following best describes convection?

Accepted Answer

Heat transfer by the bulk movement of fluid.

Question 19

Which of the following is a real-world example of heat transfer by radiation?

Accepted Answer

The warmth felt from sunlight.

Chapter 17: Temperature and Heat – Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard