Which of the following is the smallest unitbm k/ f/.l w/dw1mxnd,x )nfy/ of heat energy?

  The amount of heat necessary to raisep ko:;*dy5poz39)vxbkc c n:k the temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic enet8 dlz,0jl:zypbx +:u 8.) .zuopipturgy of individual molecules is referred to as.,jzzld8)u x:y itz .u ppto0+u:8lb p

  A cup of water is scooped up from a swimming pool of water. Compaht*0il vcb779l m8/umt s+t gpre the temperature T and the integtt7hvl*m 97cpl/+u t 8 0mbisrnal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends ,i : +0tcq-b(gpahrpm2 me x*48 znawxon

  An ideal gas at STP is first compressed unti;1d bvo 4pbtr3l its volume is half 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 internal energy of the gas is U, the finalrb1o 3p;dvtb 4 internal energy of the gas will be

  An ideal gas with inte 9j (dg ;d;z1jvook0hurnal energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatura6of*cvii *0 jes do not vary drastically is that

  It is a well-known fact that water has19wvnmv (e,qt lcas-9 s,vif :l+tx9 c a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in 1nvc,m9vtivx- a +csw: tl ql,e9s9(fthermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of a hot piece of aluminum and15fw6(pz y-p7n eshy u/wls3 d a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than douse 1/ puh73sw5 dfp-6(yzlnywble that of copper. Which object experiences 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 solzcoalii h30ro(,zen7.rz q1vc v l) 73id to the liquid state is referreev7 zr0zi aoo3qc 3hcnz1v, .l )(7rild to as the

  The heat required to change a substance from the liquid to thv6z7 e4 k x:ac5t5nykh/ cxrp7e vapor state is referkt 5zxcp a: 647/nxh75vrykcered to as the

  If heat is added to a pure substance at a stekvya(+1,fh oza: pa*,r k vlc0ady rate,

  When a solid melts

  When a liquid freezes+zlm u74n*s c r4b4ldn

  When a liquid evapora )yeuj qpje2d/+nuwsffe 5l .1 q1p-0jtes

  When a vapor condenseghv,(y5 yo1fa7 kvf1qv0llm) s

  In a cloud formation, water vapor condenses into water droplets which get ba 27 z6csoxqqq9.u3ybigger and bigger until it rains. This will cause the temperature of the acou9bq2x 3 y qqsz7.6air in the clouds to

  Turning up the flame unde5 x4yqsnxr ght8d;2ptk+ yg20s 41q ter a pan of boiling water causes

  Equal masses of water at uj6-j1xv w7ji $20 \; ^{\circ}C$ 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 me nu:y5 z08ukggans of molecular collisions is referred to asgu5:k0yn z8 gu

  By what primary heat transfer mechanism dyypga,s,t b kci2:/( nfby -9w+zeg3foes one end of an iron bar become hot when the other end is place yif-/bp eg(c: a,2ys3t9,z fnywkb+g d in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a piece mwr sq48a/an5 .b/jwh8hu csl , )v/txof wood. This is /ma5q wtvn)lrh8,a8shs.x buj/c w/ 4 due to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous material, l,r);p eb0ryvthe rate of heat loss for a given temperature difference across the thicp r0),l; eryvbkness will

  A layer of insulating material with thermal conductivity K r. l7y-6a. sqks, gdezfj40 nais placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the compolfga 4ern ,-s0q6s.ad y.z 7kjsite sheet?

  The process whereby heat flx3yrg7y-e4 n tr0v+o0n+w wmtows by the mass movement of molecules from one place to another is refer-noy0t0n7+3vwy 4trx e m+rg wred to as

  By what primary heat transfer mechanism is a pot of wayc/9* arl9 v-./b xbv3kexc mjter heated on a stove?

  Convection can occur,rbwbv (vkovc//0pv +

  Which of the following best explains why sweating is importt ynr ,s,7cfp1ant to humans in maintaining suitable body te ftp,1r,7 cnysmperature?

  A spaceship is drifting in an environment where the acceleration of gravid86crvih8 p7p ,kkv6vty is essentially zero. As the air on one side of the cabin is heated b 866kipv7vp ,kcvrhd8y an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materials. 6zt9wpimda hc1c b.f7j n 4(4tOne 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 temperaturd bccz9wnt(6i1am4 jhft7.4pe on a cold day? Compared to the small house, the larger house would need heat supplied at

  If the absolute tempem oxc/k w6az09rature of a radiator is doubled, by what factor does the radiating powe 6z9 cm0xwoka/r change?

  The process whereby heat flows in the absence of any mediukbzail9z-+ p. m is referred to as

  By what primary heatpkjd/+ bqc+ , vkhq5p; transfer mechanism does the Sun warm the Earth?

  1700 J of work is equvl13l/dw(zptepe9 x.y ,qg7g ivalent to how much heat?

  16.5 kcal of heat is equivalentf td)z6fzc2 fn.g-z-c to 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 the temperature of 100 g of leac7t-*;8zgh8vbzei rdd ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg o 9+w,mk( dhm/suas*fdf water, what is the resulting temperature chasu+sk,dm a*m h 9d(f/wnge?

  A 4.0-kg aluminum bl4-bflx9 2a rhsztj7imt:(f 0nock is originally at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises the temperature of 2.0 kg of material boenv2lxxoo 95rffy8 xe:n;k g1.* yo4y $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by add452qw.tzvl1(lk giwj ing 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 6 x 0cmkb;80ze cs ydrmuvgo.06tjx0,and 0.16 kg of copper. How much heat is added tom0ct,0y6xxbrjov. kdm0;8se uc 6z0g the 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 heated to:h5ild4d opltm x5g/ )5to)jt $100 \; ^{\circ}C$ 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 coppw1gw)v;pk)f s2y. zsdaf 5f5eer, initially 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 8 cdckk;xht4h,i5u /jat $100 \; ^{\circ}C$ 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 system that is thermally isolated from ibcb( k xc3h/jzow *29r;2g wqzts surroundings. One objectz/zh bw(o * 3q ;gcjxc9bw2rk2 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 between v s,sz;-lso 5dgarious forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperature rise would one expect for a waterfall with a ver-; s5zod s,lsgtical drop of 20 m?

  The water flowing over Niagara Falls d g(se,;yl o tu3j8v4perops a distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, bp te y38g;lou4 (vsje,y what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming na1 *j oyudf+ myt(h/-xo heat loss, how long would it take to heat water in this tay*-f o yd/hj(x+umt1a nk from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to 0ws17:9(sp ay ijsf )xair*ulheat 20 kg of water fromrsf j*l(x s91uipy7:wa )sai0 $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mas(5ers0nk ,djas 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 knife blade (specificy;u /(ku0n;q .fk ;-/ ww.zfqt7ugabxcu cd0m 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 stdbavyw/ ;9:v e(e0y9ot hgrcnz 5-3l oeam to change it to liquid?

  Ice has a latent healvm03: 4ufp tiw qdod,(yy 0j/us9dj1t of fusion of 80 kcal/kg. How much heat is required to melt 20:0sldd9m,iqfd1you(j p04/v 3 ytuwj 0 g of ice?

  How much heat energy is needed to)d8dzbtig5) d change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remxoj/akaipu+3,,xc ) +7 wkh mtoved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. Whez2 dwh+ k ,*:ihcvoiz9n 50 g of 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 initialtd6 w(3igx z:vo)k8o*aarn tj 6l b+5xly at $100 \; ^{\circ}C$ 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 a5eq :dpo5jv n-t $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy -ow ox8cbke z 6*ye-i,is needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required9, lfg kfbkv89 to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to chz77ye syg)2v vange 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 oiu4+3ve xz3 fkg 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 5.9 kcal/kg, and the heat of vaporizatiooju4y;x/: uion is 207 kuux oiy :jo;4/cal/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 conczf-)nd.;-ty*w9ag1qxevrg hk o7a+u rete 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 of aluminum irns +3yxw) -qf g8gp2rs twice that of brass. Two rods (one aluminum and the other bs+823xnr-r g wp f)ygqrass) are joined together end to end in excellent thermal 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 th. d zv3s5xqis axxz)5dr4 k3rn/01agv ick has dimensions of 3.0 m by 1.5 m. If the outside temperature /d rgds34 0vsnzv5kqaxa . )1irxzx35is $-10 \; ^{\circ}C$ 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 out: 5jws 5w,vjap2z:nprside temperatn5: :wv2j5rs p az,jpwure is $-10 \; ^{\circ}C$ 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 section of cobofxked -5swm*90ht7 ncrete (*o 0sktw x-f5me b7hd9$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 transfegxs6o j0vk o/t1j6ha /m;9sbwr 1,000,000 cal of heat 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 temperagj-xy+so, (sbw,;n ppture if 4000 kcal of heat is lost through 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 temperature is moni1:3pmiw5 :c s*ydu ijctored by measuring the radiant power emittedjsc w:p 1:u id3m5c*iy through a small hole 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 -ods 19d9 vkp)ecw/dvwhen it is at $33 \; ^{\circ}C$? Take the body surface area to be $1.4 \; m^{2}$, and approximate the body as a blackbody.

  What temperature exists in3sv 2 pamlqr(n,:7 a9ysyq)wb8v hk,lside 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.