Question 1

Which of the following statements best describes the Zeroth Law of Thermodynamics?

Accepted Answer

If two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other.

Question 2

A steel bridge is 100 m long at 20°C. If the temperature rises to 40°C, what is the change in length of the bridge? (Coefficient of linear expansion for steel: $$\alpha = 1.2 	imes 10$$^{-5}$$ \, \mathrm{K}^{-1})$$

Accepted Answer

$$\Delta L = 0.024 \, \mathrm{m}$$

Question 3

Which equation correctly relates the heat $$Q$$ required to change the temperature of a mass $$m of a $$substance with specific heat $$c by$$ $$\Delta T$$?

Accepted Answer

$$Q = mc\Delta T$$

Question 4

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 5

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

Accepted Answer

Water is most dense at 4°C, so colder water stays on top and freezes first.

Question 6

A copper rod of length $$L_0 is $$heated from $$T_0 to$$ $$T_0$$ + \Delta T$$. Which formula gives the change in length?

Accepted Answer

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

Question 7

A 100 g sample of ice at 0°C is placed in 200 g of water at 30°C. What is the final temperature of the system? (Assume no heat loss to the environment, $$c_{water} = 4186 \, \mathrm{J/(kg \cdot K)}$$, $$L_f = 334,000 \, \mathrm{J/kg})$$

Accepted Answer

0°C

Question 8

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

Accepted Answer

Reflection

Question 9

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 10

A metal plate with a circular hole is uniformly heated. What happens to the diameter of the hole?

Accepted Answer

It increases.

Question 11

Which of the following best describes the physical meaning of temperature?

Accepted Answer

A measure of the average kinetic energy of the particles in a substance.

Question 12

A 2 kg block of ice at 0°C is melted by absorbing heat. How much heat is required to completely melt the ice? ($$L_f = 334,000 \, \mathrm{J/kg})$$

Accepted Answer

$$Q = 668,000 \, \mathrm{J}$$

Question 13

Which equation gives the rate of heat transfer by radiation from a surface?

Accepted Answer

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

Question 14

A 0.3 kg sample of water at 100°C is converted to steam at 100°C. How much heat is required? ($$L_v = 2,260,000 \, \mathrm{J/kg})$$

Accepted Answer

$$Q = 678,000 \, \mathrm{J}$$

Question 15

Which of the following is a real-world application of thermal expansion?

Accepted Answer

Gaps in railroad tracks to prevent buckling.

Question 16

A 0.5 kg copper rod is prevented from expanding as it is heated from 20°C to 120°C. What type of stress develops in the rod?

Accepted Answer

Thermal stress

Question 17

Which of the following statements about phase changes is correct?

Accepted Answer

The temperature remains constant during a phase change.

Question 18

A 1 kg block of iron at 100°C is placed in 2 kg of water at 20°C. What is the final equilibrium temperature? ($$c_{iron} = 450 \, \mathrm{J/(kg \cdot K)}$$, $$c_{water} = 4186 \, \mathrm{J/(kg \cdot K)})$$

Accepted Answer

Approximately 23°C

Question 19

Which of the following best describes the process of convection?

Accepted Answer

Heat transfer by the bulk movement of fluid.

Chapter 17: Temperature and Heat – Study Notes

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