Section I

1. Which one of the following temperatures is approximately equal to "room temperature?" (68 degrees F)
A) 0 K B) 0 °C C) 100 °C D) 100 K E) 293 K

2. The digital sign outside a local bank reports that the temperature is 44 °C. What is the temperature in degrees Fahrenheit?
3. A metal rod 40.0000-cm long at 40 °C is heated to 60 °C. The length of the rod is then measured to be 40.0105 cm. What is the coefficient of linear expansion of the metal?

4. The coefficient of linear expansion of steel is 12*10^-6/C°. A railroad track is made of individual rails of steel 1.0 km in length. By what length would these rails change between a cold day when the temperature is -10 °C and a hot day at 30 °C?

5. The coefficient of linear expansion of aluminum is 23*10^-6/C°. A circular hole in an aluminum plate is 2.725 cm in diameter at 0 °C. What is the diameter of the hole if the temperature of the plate is raised to 100 °C?

6. Complete the following statement: The term heat most accurately describes
A) the internal energy of an object.
B) a measure of how hot an object is.
C) the absolute temperature of an object.
D) the molecular motion inside of an object.
E) the flow of energy due to a temperature difference.

7. The units of heat are equivalent to those of which one of the following quantities?
A) force/time B) work C) temperature D) specific heat capacity E) power

8. A 2.00-kg metal object requires 5.02 * 10^3 J of heat to raise its temperature from 20.0 °C to 40.0 °C. What is the specific heat capacity of the metal?

9. A 0.20-kg lead shot is heated to 90.0 °C and dropped into an ideal calorimeter containing 0.50 kg of water initially at 20.0 °C. What is the final equilibrium temperature of the lead shot? The specific heat capacity of lead is 128 J/(kg • C°); and the specific heat of water is 4186 J/(kg • C°).

10. Heat is added to a substance, but its temperature does not rise. Which one of the following statements provides the best explanation for this observation?
A) The substance must be a gas.
B) The substance must be a non-perfect solid.
C) The substance undergoes a change of phase.
D) The substance has unusual thermal properties.
E) The substance must be cooler than its environment.

11. A 5.0-g sample of ice at 0.0 °C falls through a distance of 20.0 m and undergoes a completely inelastic collision with the earth. If all of the lost mechanical energy is absorbed by the ice, how much of it melts?
   

Section II

1. Which one of the following statements best explains why convection does not occur in solids?
A) Molecules in a solid are more closely spaced than in a gas.
B) The molecules in a solid are not free to move throughout its volume.
C) Molecules in a solid vibrate at a lower frequency than those of a liquid.
D) Solids are more compressible than liquids.
E) Solids are less compressible than gases.

2. The ends of a cylindrical steel rod are maintained at two different temperatures. The rod conducts heat from one end to the other at a rate of 10 cal/s. At what rate would a steel rod twice as long and twice the diameter conduct heat between the same two temperatures?

3. The space between the inner walls of a thermos bottle is evacuated to minimize heat transfer by
A) radiation. D) conduction and radiation.
B) conduction. E) conduction, convection, and radiation.
C) conduction and convection.

4. At what rate is heat lost through a 1.0 m*1.5 m rectangular glass windowpane that is 0.5 cm thick when the inside temperature is 20 °C and the outside temperature is 5 °C? The thermal conductivity for glass is 0.80 W/(m • C°).

5. A cabin has a 0.159 m thick wooden floor [k = 0.141 W/(m • C°)] with an area of 13.4 m^2. A roaring fire keeps the interior of the cabin at a comfortable 18.0 °C while the air temperature in the crawl space below the cabin is -20.6 °C. What is the rate of heat conduction through the wooden floor?

6. A granite wall has a thickness of 0.61 m and a thermal conductivity of 2.1 W/(m • C°). The temperature on one face of the wall is 3.2 °C and 20.0 °C on the opposite face. How much heat is transferred in one hour through each square meter of the granite wall?

7. In an experiment to determine the thermal conductivity of a bar of a new alloy, one end of the bar is maintained at 0.0 °C and the other end at 100.0 °C. The bar has a cross-sectional area of 1.0 cm2 and a length of 15 cm. If the rate of heat conduction through the bar is 24 W, what is the thermal conductivity of the bar?

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