Which of the following is the smalle 5snf 9:kco-npz3) nwpst unit of heat energy?

  The amount of heat necessary to raise the tyi88p* twgg/qemperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinet :vg8)f3e zxd pn(xw/1c1e4he xziic8 ic energy of individual molecules is referred to as8nxhzez d (x1eeg8 / x)iv4iwcfc13p:

  A cup of water is scoopedw ,f6 i(jvkn0b6b uk*r up from a swimming pool of water. Compare the temperature T and the internal ek6vinrf,b6*ub w0jk (nergy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas dependb i9cb/x,loz .s on

  An ideal gas at STP is first compressed until its volume is r f (i+otkvcz0i/u8v1a.6dh ohalf the initial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is done while holding the temperature constant. If the initial inte0rz1f+c/i k 8 ai .v6vohdu(otrnal energy of the gas is U, the final internal energy of the gas will be

  An ideal gas with internal energy U acueq kaw47 4(at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary dra t,eutk2:uic 0stically is that

  It is a well-known fact that water has a higher specific heat capacity thanetet9wc6xu6wt. kv0i7cukz /v:r 6;n iron. Now, consider equal masses of water and irokv97 tzu6 :6 . e tuknww;i0/tvcr6cexn that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated syst9fxpp;oy-*hja 7 l a,cem is made up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object eol jp pcy7;f9 hx-a*,axperiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium?

  Phase changes occur

  The heat required to change a substance from the solid to the liquid state is, oqclik*0s*l referclo* *qslik, 0red to as the

  The heat required to changlj 6(er(f:ww ce a substance from the liquid to the vapor state is referred to as the6j(flcw(e rw:

  If heat is added to a pnz5, oq4nzcxy5hug r8 el 2drpjn*p4oc i-1 (+ure substance at a steady rate,

  When a solid melts

  When a liquid freezezaf j5ek ab+7;s

  When a liquid evaporate +*+ h4zbkgouzg;bd( q.z;hkq s

  When a vapor condense- nse2rfpziu1j/, tc jw0z: tz0/qc(ws

  In a cloud formation, water vapor cono-o d 4 e45qhb2 b/(cflfhahi358h9le ) ivbjxdenses into water droplets which get bigger and bigger until it rains. This will cause the temperatv2 ii4oob49cxdeqbl8h3 hhhjf(lf5) -/a b5 e ure of the air in the clouds to

  Turning up the flame undes4s )qcfc0 )pxr a pan of boiling water causes

  Equal masses of watef d)vl0pt c) g02uxk*lr at $20 \; ^{\circ}C$ and $80 \; ^{\circ}C$ are mixed. What is the final temperature of the mixture?

  A chunk of ice ($T = -20 \; ^{\circ}C$) is added to a thermally insulated container of cold water ($T = 0 \; ^{\circ}C$). What happens in the container?

  The process whereby heat flows by means of mol 1n7ji)ka(gvm6vqv d tc/n)z:ecular collisions is referred to asnkz )/7vnd1 c: 6qm(tavgi) vj

  By what primary heat a6dmo mkgy57* .j d.mp96 cyjztransfer mechanism does one end of an iron bar become hot when the other end is placed in a j6mydg*oap 69dm5z m7y j. .ckflame?

  On a cold day, a piece of metal feels much colder to the touch than a8-/qwmxq jk,5e4t:w 7l ebxv z piece of wood. This is due to the difference in which one of the fok-4tmzxqvwwq8, 5e ex jb l7:/llowing physical property?

  If you double the thickness of a wall built from a homogeneous material, the rai 1 p/yry udhypi69.j8te of heat loss for a given temperature diffey6i1 h yy 8rij.ud/p9prence across the thickness will

  A layer of insulating material with therh) +: jcsa9zfemal conductivity K is placed on a layer of another material of thermal conductivity 2K. jsz+:feh a)c9 The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of moh. rs5qj+y*mwj h8y:alecules from one place to another hm:qy a5s8j wjrh.+ *yis referred to as

  By what primary heat transfer mechwo; -u c2m3gnranism is a pot of water heated on a stove?

  Convection can occurb 60w6oas (pjr

  Which of the following best explai0/m/uh( c ivcqns why sweating is important to humans in maintaining suitable body tempera0uc(/mh/v iq cture?

  A spaceship is drifting mr 4so 7e0nf59r8waw hin an environment where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convews4 froe an9hr78w 05mction currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materialswbvz (y )20ejt. One of the houses has twice the length, width, and height of the other. Under identical climatic conditions, what would be true about the rate that heat would have to be supplied to maintain the same inside temperature on a cold day? Compared to the small house, e jy2)0ztv w(bthe larger house would need heat supplied at

  If the absolute temperature of a radiator is doubled, by what factor nf3 ;m g7(*q5vqcb udg/ h4wh4ak7nondoes the radiating power changewg4nd4fc/h vnk 77m( h o5gq3n*qu;b a?

  The process whereby heat flows in 64lx,jtog+q i;( /k*l ccxvogthe absence of any medium is referred to as

  By what primary heat transfer mechanism does the Sun nzc*l 3ll ,zj4warm the Earth?

  1700 J of work is equivalent to how muc.8zb; di9 q(-ge noi0wwz2fxe h heat?

  16.5 kcal of heat is equivalent tztltbkl 5)o5/ms *d, ai +l;hdo how much work?

  Gasoline yields $4.8 \times 10^{7} \; joules$ per kg when burned. The density of gasoline is approximately the same as that of water, and 1 gal = 3.8 L. How much energy does your car use on a trip of 100 mi if you get 25 mi per gallon?

  How much heat is needed to raise tiria 9g*:zdi5 he temperature of 100 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, what vi orzp3t uyi ;-v0wv.gf c0e80 c:ht5is the resulting temperature ch;0p 03c0 :wh-zf 8tivvcogu5ri .v etyange?

  A 4.0-kg aluminum block is originally atz4 8u86g)gv(m knpprv $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises the temperature )6w6wt fma 5f 00fpymlof 2.0 kg of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by adding)2w2m iie*utjdm-wo4v( +vm kw (x ah+ 5.0 L of water at $80 \; ^{\circ}C$ to 60 L of water at $30 \; ^{\circ}C$. What is the final temperature of the water?

  A machine part consists of 0.10 kg of iron and 0.16 kg of copper. How much heatu6sqh e*i0-,f g kw*fe is added to thei *g sffuh* 0eqk-ew,6 gear if the temperature increases by $35 \; ^{\circ}C$?

  50 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) at $100 \; ^{\circ}C$ is put into 75 g of water at $0 \; ^{\circ}C$. What is the final temperature of the mixture?

  A 0.600-kg piece of metal is bp+w *2g/uwb3luk bi) heated to $100 \; ^{\circ}C$ and placed in an aluminum can of mass 0.200-kg which contains 0.500 kg of water initially at $17.3 \; ^{\circ}C$. The final equilibrium temperature of the mixture is $20.2 \; ^{\circ}C$, what is the specific heat of the metal?

  A 0.10-kg piece of copper, inito y0lb;k7 u4t4xzg dw.ially at $95 \; ^{\circ}C$, is dropped into 0.20 kg of water contained in a 0.28-kg aluminum can; the water and aluminum are initially at $15 \; ^{\circ}C$. What is the final temperature of the system?

  If 50 g of material atu:j dd-qeh v2(pd-j6pr,hx*j $100 \; ^{\circ}C$ is mixed with 100 g of water at $0 \; ^{\circ}C$, the final temperature is $40 \; ^{\circ}C$. What is the specific heat of the material?

  Two equal mass objects make up a syste)ave ge wj686- 7iqt9aqjq a8im that is thermally isolated from its surroundingsjvq-w9 eq 8i76g6jaea itq 8a). One object has an initial temperature of $100 \; ^{\circ}C$ and the other has an initial temperature of $0 \; ^{\circ}C$. What is the equilibrium temperature of the system, assuming that no phase changes take place for either object? (The hot object has a specific heat capacity that is three times that of the cold object.)

  On his honeymoon, James Joule attempted to explore the relationships betwe3wfvdp q y)cpsd.*n 04en various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperatuv) yfqp3*40cddwn .spre rise would one expect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a distance of 50 m. Assow 1rlas x0.p5uming that all the gravitational energy is converted to thermal energy, by what temperature does thx5ao1 l.srwp 0e water rise?

  A 200-L electric water heater uses 2 kW. A nrgeu.+ci03mn 4b7mcssuming no heat loss, how long would it take to heat water in this tank from cn7g+b4c0mei3rm u .n$23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heat lf icek qt3p-adk2 ,wt-8 y16p20 kg of water ,e p86i31t- 2f dklqwtc p-kayfrom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mak5ewqaq8*6xk bwo l2287p v xqss 1000 g, $c = 0.22 \; kcal/kg \cdot ^{\circ}C$) holds 400 g of pure water at $20 \; ^{\circ}C$. The kettle is placed on a 1000 W electric burner and heated to boiling. Assume that all the heat from the burner heats the kettle and its contents, and that a negligible amount of water evaporates before boiling begins. Calculate the amount of time required to bring the water to boil.

  In grinding a steel ne 8usm smo(93knife blade (specific heat = $0.11 \; cal/g \cdot ^{\circ}C$), the metal can get as hot as $400 \; ^{\circ}C$. If the blade has a mass of 80 g, what is the minimum amount of water needed at $20 \; ^{\circ}C$ if the water is not to rise above the boiling point when the hot blade is quenched in it?

  How much heat must be removed from steam to changeciwwl-+*ia9w ;ap kta;w6 9al it to liquid?

  Ice has a latent heat of fusion of 80 p2y a+9gpp;dqkcal/kg. How much heat is required to melt 200 g of ice?2 pypg9;pd+qa

  How much heat energy isnxtu6z:)v dz 7l hy08y needed to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100 g oy,5 n2:t/dapl3coflp r jn:r-f $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When 50 g of.axe4v vdr:f ,+wn5 hy ice at $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water initially at7bwvbtsi ;bbj gmiczs9-50* ; $100 \; ^{\circ}C$ are poured into a cavity in a very large block of ice initially at $0 \; ^{\circ}C$. How many g of ice melt before thermal equilibrium is attained?

  A block of ice at $0 \; ^{\circ}C$ is added to a 150-g aluminum calorimeter cup that holds 200 g of water at $10 \; ^{\circ}C$. If all but 2.00 g of ice melt, what was the original mass of the block of ice?

  If 2.0 kg of water at /tea3a q8v)xlzc;u 3e$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of wate utqqq7hd0j2qz/ 0fq0r at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change 9,(1o2doesz:t(dabml jyd5v one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required toguh/.q8f7ri5th:odm n/ mg+x change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg:wwctg66f as1 zba)9 k of hot tea, initially at $80 \; ^{\circ}C$. How many kilograms of ice, initially at $0 \; ^{\circ}C$, are required to bring the mixture to $10 \; ^{\circ}C$?

  The heat of fusion of lead is 5sw9 -qqgm urbe n54pm,m8(en. .9 kcal/kg, and the heat of vaporization is 207 k,uw9q(ee q4b5p8rsn mmn-. gmcal/kg, and its melting point is $328 \; ^{\circ}C$. How much heat is required to melt 50 g of lead initially at $23 \; ^{\circ}C$? (The specific heat of lead is $0.031 \; kcal/kg \cdot ^{\circ}C$)

  The thermal conductivity of con0z s3z*7.cfm/ def7seq 2pibt crete is $0.8 \; W/m \cdot ^{\circ}C$ and the thermal conductivity of wood is $1.1 \; W/m \cdot ^{\circ}C$. How thick would a solid concrete wall have to be in order to have the same rate of flow through it as an 8-cm thick wall made of solid wood? (Assume both walls have the same surface area.)

  The thermal conductivity s)+pjkq2a6 r8dbu ) lcof aluminum is twice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal+aj)6q 82rbp dcus) lk contact. The rods are of equal lengths and radii. The free end of the brass rod is maintained at $0 \; ^{\circ}C$ and the aluminum's free end is heated to $200 \; ^{\circ}C$. If no heat escapes from the sides of the rods, what is the temperature at the interface between the two metals?

  A window glass 0.50-cm thick has dimensions of 3.0 m by 1.5 m. Ifczq39z gbqx3 (r.wtk z(z*2s 8b vw:uc the outside tem39 u.x * (zqzzwbvbwktzc:328qs( cg rperature is $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cm thick has dimensions of 3.0 m by 1.5 m. If the ou;l+q uj 4549caqms9bh,4n 7xc obbsyntside temperature is 9,4oy uc;n4 7xhsa4bl+q9bjq ns 5mcb$-10 \; ^{\circ}C$ and the inside temperature is $20 \; ^{\circ}C$, how much heat flows through the window in one hour by conduction only?

  How much heat will flow in 1.0 hour through a 2.0 m x 2.0 m sectca2dvisr;gi/c1vlt 1h9ro4g79li p. ion of concrete 942r 7ig9c; t1hlsc. l vorpav/dgi1i($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it take to transfer 1,000,000 cal of hea/(7w8f szlyu st through a $2.0 \; m^{2}$ pane of 0.30 cm thick glass ($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) if the temperature differential is $10 \; ^{\circ}C$?

  What is the outside temperature if 4000 kcal of heat is lost thrs9w;fwclt o1oom-0/r zp0gs h4vx g58ough a $4.0 \; m^{2}$ pane of 0.30 cm thick glass ($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) in one hour from a house kept at $20 \; ^{\circ}C$?

  In an electric furnace used for refining steel, the te/ r 8skm.gzd:mmperature is monitored by measuring the radiant power emitted through a small ho.s:r mk/mz 8dgle of area $0.5 \; cm^{2}$. The furnace acts like a blackbody radiator. If it is to be maintained at a temperature of $1650 \; ^{\circ}C$, at what level should the power radiated through the hole be maintained?

  At what rate is the human body radiating energy when it is rf8-vl ):vj rpat $33 \; ^{\circ}C$? Take the body surface area to be $1.4 \; m^{2}$, and approximate the body as a blackbody.

  What temperature exists g- wlxogn;.h *nj (3sxn2abu,inside a solar collector (effective collection area of $15 \; m^{2}$) on a bright sunny day when the outside temperature is $+20 \; ^{\circ}C$? Assume that the collector is thermally insulated, that the Sun radiates the collector with a power per unit area of $600 \; W/m^{2}$, and that the collector acts as a perfect blackbody.