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Name:    Online Review - Heat Chapter 10

Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
A B C D	1.	A substance’s temperature increases as a direct result of a. energy being removed from the particles of the substance. b. kinetic energy being added to the particles of the substance. c. a change in the number of atoms and molecules in a substance. d. a decrease in the volume of the substance.
A B C D	2.	What happens to the internal energy of an ideal gas when it is heated from 0°C to 4°C? a. It increases. c. It remains constant. b. It decreases. d. It is impossible to determine.
A B C D	3.	Which of the following best describes the relationship between two systems in thermal equilibrium? a. No net energy is exchanged. c. The masses are equal. b. The volumes are equal. d. The velocity is zero.
A B C D	4.	What is the temperature of a system in thermal equilibrium with another system made up of ice and water at 1 atm of pressure? a. 0°F c. 0 K b. 273 K d. 100°C
A B C D	5.	Heat flow occurs between two bodies in thermal contact when they differ in which of the following properties? a. mass c. density b. specific heat d. temperature
A B C D	6.	A substance registers a temperature change from 20°C to 40°C. This corresponds to an incremental change of a. 20 K. c. 36 K. b. 40 K. d. 313 K.
A B C D	7.	What temperature has the same numerical value on both the Celsius and the Fahrenheit scales? a. –40° c. 40° b. 0° d. –72°
A B C D	8.	What is the temperature increase of 4.0 kg of water when it is heated by an 8.0 ´ 102 W immersion heater for exactly 10.0 min? (cp = 4186 J/kg·°C) a. 57°C c. 29°C b. 51°C d. 14°C
A B C D	9.	A machine gear consists of 0.10 kg of iron and 0.16 kg of copper. How much total energy transfer as heat is generated in the gear if its temperature increases by 35°C? (ci = 4.6 ´ 102 J/kg·°C and cc = 3.9 ´ 102 J/kg·°C) a. 910 J c. 5100 J b. 3800 J d. 4400 J
A B C D	10.	A slice of bread contains about 4.19 ´ 105 J of energy. If the specific heat of a person is 4.19 ´ 103 J/kg·°C, by how many degrees Celsius would the temperature of a 70.0 kg person increase if all the energy in the bread were converted to heat? a. 2.25°C c. 1.43°C b. 1.86°C d. 1.00°C
A B C D	11.	A flat container holds 200 g of water. Over a 10 min period, 1.5 g of water evaporates from the surface. What is the approximate temperature change of the remaining water? (Lv = 2.26 ´ 103 J/g) a. 4°C c. 0.4°C b. –4°C d. –0.4°C
A B C D	12.	A 5.0 ´ 102 g ice cube with an initial temperature of 0.0°C is placed in a plastic-foam box whose walls are 1.0 cm thick and whose total surface area is 6.0 ´ 102 cm2. If the temperature of the air surrounding the box is exactly 20.0°C and it takes 4.0 h for the ice to completely melt, what is the conductivity of the plastic-foam material? (Lf = 3.3 ´ 102 J/g) a. 4.0 ´ 10–2 J/m·s·°C c. 5.0 J/m·s·°C b. 1.2 ´ 10–3 J/m·s·°C d. 9.6 ´ 10–2 J/m·s·°C
A B C D	13.	Which of the following is a substance in which the temperature and pressure remain constant while the substance experiences an inward transfer of energy? a. gas c. solid b. liquid d. substance undergoing a change of state
A B C D	14.	On a sunny day at the beach, the reason the sand gets hot and the water stays relatively cool is attributed to the difference in which property between water and sand? a. mass density c. temperature b. specific heat d. thermal conductivity
A B C D E	15.	A 200.0-kg object is attached via an ideal pulley system to paddle wheels that are submerged in 0.480 kg of water at 20.0 °C in an insulated container as shown in the figure.  Then, the object falls through a distance of 5.00 m causing the paddle wheel to turn.  Assuming that all of the mechanical energy lost by the falling object goes into the water, determine the final temperature of the water.             a. 4.90 °C b. 20.5 °C c. 24.9 °C d. 40.4 °C e. 98.2 °C
A B C D E	16.	A 0.030-kg ice cube at 0 °C is placed in an insulated box that contains a fixed quantity of steam at 100 °C. When thermal equilibrium of this closed system is established, its temperature is found to be 23 °C. Determine the original mass of the steam at 100 °C.             a. 0.17 g b. 1.7  g c. 2.5 g d. 4.8 g e. 5.0 g
A B C D E	17.	Judy places 0.150 kg of boiling water in a thermos bottle.  How many kilograms of ice at –12.0  °C must Judy add to the thermos so that the equilibrium temperature of the water is 75.0 °C? a. 0.0233 kg b. 0.0265 kg c. 0.0436 kg d. 0.0713 kg e. 0.625 kg
A B C D E	18.	Complete the following statement:  The transfer of heat by convection will occur a. only in metals. b. only in a vacuum. c. only in non-metallic solids. d. with or without the presence of matter. e. only in the presence of a liquid or a gas.
A B C D E	19.	Which one of the following processes does not occur during the convective transfer of heat within a container of air? a. The volume of a warmed part of the air is reduced and its density increases. b. A continuous flow of warmer and cooler parts of air is established. c. The flow of air molecules results in a flow of heat. d. The cooler portion of the air surrounding a warmer part exerts a buoyant force on it. e. As the warmer part of the air moves, it is replaced by cooler air which is subsequently warmed.
A B C D E	20.	Complete the following statement:  Most of the heat that is lost to space from the earth occurs by a. conduction. b. convection. c. radiation. d. both conduction and radiation. e. both conduction and convection.