1. The formula ∆? = ???∆? is only good if ∆? is not too large.According to your textbook, what is considered a “not too large∆??” (a) ∆? ≈ 1 ?° or less (c) ∆? < 100 ?° or so (b) ∆? ≈ 10 ?°or less (d) ∆? < 200 ?° or so

2. In the formula ∆? = ???∆?, what is ?? (a) The specific heat ofthe substance (b) The thermal resistivity of the substance (c) Thelatent heat of fusion of the substance (d) The coefficient ofthermal expansion of the substance (e) One-third of the coefficientof linear thermal expansion of the substance.

3. Find this passage in section 17.4 and fill in the blank. This isan important statement: For ___________ materials we can find asimple relationship between the volume expansion coefficient  andthe linear expansion coefficient  . (a) most (d) frozen (b) all(e) liquid (c) solid

4. What is that simple relationship between ? and ?? (a) ? = 3? (d)? = 1 3 ? (b) ? = 2? (e) ? = 3 2 ? (c) ? = 1 2 ? 5. The table ofcoefficients of expansion in the textbook lists ? for glycerin as49 × 10−5 K−1. Would it be correct, then, to say that ? forglycerin must be about 16.3 × 10−5 K−1 (a) Sure, if ∆? is not toolarge, as specified before. (b) No, we cannot specify ? for asubstance like glycerin.

6. Which of the following is the most reasonable problem-solvingapproach? (a) We can always use ∆? = ???∆? when dealing withsolids; but we use ∆? = ?? ?∆? when dealing with gases or liquids.(b) We can always use ∆? = ???∆? and cube the result if we want ∆?.(c) Apply ∆? = ???∆? to the longest dimension of an object only.(d) We can use ∆? = ???∆? only for metals; for all other substancesuse ∆? = ?? ?∆?.

7. Two cylinders made of the same material and have the sameexternal dimensions, but one is solid and the other is hollow.Their temperature is increased to the same final temperature andthey expand. How will their final sizes compare? (a) They willstill have the same external dimensions. (b) The hollow one will belarger. (c) The solid one will be larger.

8. Why is it sometimes possible to loosen metal caps onscrew-top glass jars by dipping the capped jar briefly into hotwater? (a) The hot water makes the cap expand, but not the bottle.(b) The hot water makes the bottle contract while the cap expands.(c) The metal cap expands more than the glass bottle for the sameT.

9. Go to Page 547 and look at Figure 17.3 that shows abimetallic strip. A bimetallic strip is made by bonding twodifferent materials that have the same dimensions at the sameinitial common temperature. Suppose that in Figure 17.3 metal 1 iscopper. Which of the following materials could be used for metal 2?(a) Steel (b) Invar (nickel-iron alloy) (c) Brass

10. The figure shows a rectangular brass plate at 0°C in whichthere is cut a rectangular hole of dimensions indicated. If thetemperature of the plate is raised to 150°C: (a) x will increaseand y will decrease (b) both x and ywill decrease (c) x willdecrease and y will increase (d) both x and ywill increase (e) thechanges in x and y depend on z

11. When water at 2°C absorbs heat, what happens? (a) It meltswhile its volume increases. (b) It warms up while its volumeincreases. (c) It cools down while its volume decreases. (d) Itvaporizes as it cools down. (e) It warms up while its volumedecreases.

12. The coefficient of linear expansion of steel is 12 x 10–6 /C°.A railroad track is made of individual rails of steel 1.0 km inlength. By what length would these rails change between a cold daywhen the temperature is –10°C and a hot day at 30°C? (a) 0.62 cm(d) 480 cm (b) 24 cm (e) 620 cm (c) 48 cm

13. A steel tank of volume 0.0700 m3 is filled to the top withgasoline at 20.0°C. The tank is placed inside a chamber at atemperature of 50.0°C. The coefficient of volume expansion forgasoline is 9.50 x 10–4 /C°; and the coefficient of linearexpansion of steel is 12.0 x 10–6 /C°. After the tank and itscontents reach thermal equilibrium with the chamber, how muchgasoline has spilled? (a) 2.52 x 10–5 m3 (b) 7.56 x 10–5 m3 (c)1.69 x 10–3 m3 (d) 1.92 x 10–3 m3 (e) 3.00 x 10–3 m3  

14. A copper plate has a length of 0.12 m and a width of 0.10 mat 25°C. The plate is uniformly heated to 175°C. If the linearexpansion coefficient for copper is 1.7 x 10–5 /C°, what is thechange in area of the plate as a result of the increase intemperature? (a) 2.6 x 10–5 m2 (b) 6.1 x 10–5 m2 (c) 3.2 x 10–5 m2(d) 4.9 x 10–5 m2 (e) 7.8 x 10–5 m2

15. A ring made of steel has a 2.5000-in inside diameter whenthe temperature is 20.0°C. The ring will be warmed until it can fitaround a brass rod of 2.5020-in outer diameter. Calculate to whattemperature should the ring be warmed. (a) 83.4 °C (b) 86.7 °C (c)82.1 °C (d) 833 °C (e) 66.6 °C  

16. During heat conduction, the heat transfer (“heat flow”) isalways (a) From higher to lower temperature (b) From lower tohigher temperature (c) Could be either way, depending on the typeof material

17. According to the textbook, why are many insulating materialssuch as Styrofoam and fiberglass good insulators? (a) Because theyare always colder than the environment. (b) Because they tend tohave low specific heats. (c) Because they contain mostly dead air.(d) Because they cannot be heated. (e) Because their melting pointsare very high.

18. Which of the three modes of heat transfer is the one thatdepends on moving matter from one region to another? (a) Conductiononly. (d) Both conduction and convection. (b) Convection only. (e)None of them – heat is not matter. (c) Radiation only.

19. You will use fiberglass to insulate a house. If a space 6inches wide (that’s 15.24 cm) is to be completely filled withfiberglass, what will be the thermal resistance of the fiberglasslayer? (a) 0.0061 m2·K/W (d) 3.81 m2·K/W (b) 0.260 m2·K/W (e) 150m2·K/W (c) 2.23 m2·K/W

20. You need to come up with a layer of material that provides athermal resistance of 20 W/m·K. Which of the following will giveyou that resistance with the thinnest layer? (a) Brick, red (d)Glass (b) Styrofoam (e) Felt
21. This diagram shows four slabs of different materials with equalthickness, placed side by side. The temperatures at the interfacesare shown. Assume heat conduction is happening at a steady rate.Rank the materials according to their thermal conductivities,lowest to highest. (a) 3, 4, 2, 1 (b) 4, 3, 2, 1 (c) 1, 2, 3, 4 (d)2, 1, 3, 4 (e) 3, 4, 1, 2   

22. At what rate is heat lost through a 1.0m x 1.5m rectangularglass window that is 0.5 cm thick when the inside temperature is20°C and the outside temperature is 5°C? (a) 18 W (d) 3600 W (b) 36W (e) 7200 W (c) 720 W

23. A granite wall has a thickness of 0.61 m and a thermalconductivity of 2.1 W/m·K. The temperature on one face of the wallis 3.2 °C. The other face is at 20.0°C. How much heat istransferred in one hour through each square meter of the granitewall? (a) 2.1 x 105 J (d) 1800 J (b) 1.1 x 105 J (e) 58 J (c) 7.7 x104 J

Questions 24, 25 and 26 are about the following situation: Acooking pan placed on a stove has a copper bottom that is 8.50 mmthick and 0.150 m2 in area. The water inside the pan is at 100.0°Cand 0.390 kg are being evaporated every 3.00 min.

24. How much heat energy is needed to evaporate each 0.390 kg ofwater? (a) 8.80 x 105 J (b) 1.30 x 105 J (c) 1.63 x 105 J (d) 7.52x 105 J

25. At what rate is the heat being supplied by the stove? (a)2.93 x 105 W (b) 7.22 x 102 W (c) 9.06 x 102 W (d) 4.89 x 103 W

26. What is the temperature of the bottom surface of the pan(the surface in contact with the stove)? (a) 143.13°C (b) 100.72 °C(c) 100.11 °C (d) 118.24 °C

27. A 150-W filament lightbulb is operating at a temperature of2450 K. The emissivity of the surface of the filament material is0.350. Assuming all the 150-W are radiative power, calculate thesurface area of the filament. (a) 2.1 x 10-4 m2 (b) 3.1 x 10-6 m2(c) 4.4 x 10-4 m2 (d) 7.4 x 10-5 m2 Questions 28 and 29 are aboutthe following situation: The surface area of your body isapproximately 1.71 m2. The emissivity of dry skin is approximately0.891. The normal skin-surface temperature is 33.3 °C.

Assume you are in a room where the temperature is a constant 20.0°C. 28. What is the radiation current your skin receives from theroom environment? (a) 2.53 x 10-5 W (b) 1.38 x 10-2 W (c) 66.8 W(d) 638.0 W (e) 1256 W

29. What is the net radiation power of your skin? Is it a netinput or a net output? (a) 0.0924 W, a net output (b) 0.106 W, anet input (c) 2.70 x 10-3, a net output (d) 123.9 W, a net output(e) 638.0 W, a net input



30. What is the power output of radiation of this person’s body?(Just the output, not the net.) (a) 0.0024 W (d) 815 W (b) 0.092 W(e) 958 W (c) 143 W 31. What is the power of radiation absorptionfrom the surroundings for this person? (a) 0.0024 W (d) 815 W (b)0.012 W (e) 958 W (c) 143 W 32. The net radiation power is onlyabout 80% of the basal metabolic rate. What is the basal metabolicrate of this person? (a) 179 W (d) 0.00294 W (b) 114 W (e) 0.099 W(c) 1019 W