Which of the following i1 l t3mhnc3quo8a67y is the smallest unit of heat energy?

  The amount of heat necessary to raise the temperature of fz kdcm6wce(* op/c ab,u:23q 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic yah20aj ms p-j.3,4 bkexm*rphwd;7 nenergy of individual molecules is referred to arp x hdamm2j 4*wph;0- byj,s.eak73ns

  A cup of water is scooped up s:p92h ripkfd6a c-,npp6e /y ,u2gdp from a swimming pool of water. Compare the temperature T and the internal9 p,- cr26feupphp6npidy :kad/g,s 2 energy U of the water, in both the cup and the swimming pool.

  The internal energy q hebhy 2(n8fk:d;o0 eof an ideal gas depends on

  An ideal gas at STP is first compressed until itku.8o*(/rrk,q+, itcfwbaw is 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 final interna(uar+ .ro wcqi8 *b,tfwik,k/ l energy of the gas will be

  An ideal gas with internal energy U at,epf66pawb1 si;0 o eheh,v bt4q34 zt $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do nkl32) pp)amk zot vary drastically is that

  It is a well-known fact that water has a higher specific heat capacity thxw8ol2uws d::ak(om ebvkniy4r .(60 an iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The samea::4 kb 6nmxiv(0s.ol2r8 ykw euo(wd amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of a hot pix(t sjs: m;8fdece of aluminum and a cold piece of (ds:s8fj m; txcopper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than double 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 solid to the liqui..tiot7+c+bczhbbrpd ,8 u2y d state is referred to as the.c cy2or.zubib 7++bhp 8dt,t

  The heat required to change a substance from iljqogc15+kx7j q l..)mr h)hthe liquid to the vapor state is referred to as grmh5cxk+.)l7qj lh )q.1ijo the

  If heat is added to a pure sub- v.)u:h a tvch35dt ums8zkg/stance at a steady rate,

  When a solid melts

  When a liquid freezes( ,8x lvgmyz*kb2ks 5c

  When a liquid evaporateslqosvyv8rw7 t /tq ) (;bnz(,q

  When a vapor condenseztq5j 8*m0iic s

  In a cloud formation, water vapor condenses into water droplets which gem6qhy0ntq*p9 e p.d*it bigger and bigger until it rains. This will cause the temperature of the air in the clout *pqq9*n .ih0dympe 6ds to

  Turning up the flame under a pan or9,yo v4k-xbvf boiling water causes

  Equal masses of water at )q4*6) b(fvvytpcr yji:x pp+$20 \; ^{\circ}C$ 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 molecular colli f1z1 7rmq )*+kolg pgb1oqo2ksions is referred to a o gbo*1m1zqqgf+)12l7kpkor s

  By what primary heat transfz/ z ;g9-xhdvrer mechanism does one end of an iron bar become hot when the other end is placed in a flame?;/xz- rzv 9ghd

  On a cold day, a piece of metal feels much colder to the touch than a 7zv olg287uudxp on9ei12w5bpiece of wood. This is due to the difference in which one of the following phdvop9n1gxuwub7l i52 2o z7e8ysical property?

  If you double the thickness of a wall buib33wzqims 5t( lt from a homogeneous material, the rate of heat loss for a given temperature difference 5tqz (m3 wbi3sacross the thickness will

  A layer of insulating material with thermal conducti(n mkb2f h,wyd3v;sg:vity K is placed on a layer of another material of thermal conductivity 2K. The laye hy, kfndgb3:s;m2 wv(rs have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows bypk(pd jd-)g6rq3nr, 1( bb bgn the mass movement of molecules from one place to bgr1)nr-qp( pjk6b (,nd3bd g another is referred to as

  By what primary heat transfer mechanism is a pot of water heody + ;v-nmq2zated on a stove?

  Convection can occur:imbz qcn a(tvq*(x1+l abrd-uh )w2*

  Which of the following best explains why sweating is 5tgfp0pm uf56 important to humans in maintaining s065ftm ugp p5fuitable body temperature?

  A spaceship is drifting in an environment where the acceleragm izaa qy+ h( d((1a..iecnn0tion of gravity is essentially zero. As the air on one side of the cabin is heated by (nah1c(i + i0a.neqamy zd (g.an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangulaya:22it+sg 8eio xs, lmkq d*w/c6mc:r houses built from the same materials. 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 mai2yadi /kcm m sxi6:l+,ewg cq :82o*stntain the same inside temperature on a cold day? Compared to the small house, the larger house would need heat supplied at

  If the absolute temperat lrfdcr.lwmpyc; -5, - l5 a1ztn8asj,ure of a radiator is doubled, by what factor does the radiating power c.c8mpdjsracfl nrz w,5 l-t- 1al,;y5hange?

  The process whereby heat flows in the absen)p8yb:tv4l hy ce of any medium is referred to as

  By what primary heat transfer mechanism does the Sun ne9.vd3 vtz 3qa6i a7kwarm the Earth?

  1700 J of work is equivalent to how much heajdahcz mzxdvtz2 8;m)2.g,22 ,i xx vgt?

  16.5 kcal of heat is eq1 qvl (mt0+lfb6jrigj /e r,8iuivalent 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 le y:*xyvz)zj,fad ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, what is the resultin (cbz /b/m4kzb;cb/7 n52htjxabb 7)cyyvr ,mg temperature chak4r2,/xb ;yb/ babtb y)cncmz 5/jhmv77( bzcnge?

  A 4.0-kg aluminum block is originally s)s v7- ,odf3/qwdc43oikdi uat $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises thafftb91e6t oq.5 0ouhe temperature of 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 a ,rcifl /ncav:532mkhdding 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,-.o+jpm*qx:i0fnllwj mboz bw +8c( kg of iron and 0.16 kg of copper. How much heat is added to the gear if the temperature increamb0jow(*+pmlwo fjq+xc l, 8 :n z.-ibses 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 glqpc/+c7mc6se 6ok9n .m.eu $100 \; ^{\circ}C$ 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,d4s dyqe)k-qr n c:m64 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 ata hyca7 g -,wq/za)u5s $100 \; ^{\circ}C$ 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 s- v pws/-sf 1oomxc/y2ystem that is thermally isolated from its surroundings. One object o x csys/m/- o-wfp21vhas 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 rela1ftcz1i lf6 v0tionships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperatufc 0lvfti1 z16re 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. Assuming t3ro4 q;)lg5 w/eshtyu ovdm//hat all the gravitational energy is converted to thermal ene 4/gmsu5 /3oe) d;/yqohrl vwtrgy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no hdelp9 kkmm, ;.eat loss, how long would it take to heat water i9.e;kkpmdl, mn this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heio,e5bcj/ - ctat 20 kg of water fr /-jc eob5tic,om $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (masxt okq4m+ob0+y( o- o2vjprj4s 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 (specific l5 n pcknfz j:-b6-.rvheat = $0.11 \; cal/g \cdot ^{\circ}C$), 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 change it jx ls ql5** w 7e,u0qag,4f;wyadu6lkto liquid?

  Ice has a latent heat of fusion of 80 kca41s5 4;oz fqp;qe t xprptms b(tc5.cc.4 dz3xl/kg. How much heat is required to melt 200 g of ice?z;rtmzcpx ep5t ds q43pcqt4.of b(4sc5 x1.;

  How much heat energy is needed to change 10 kg of ice 3 :6fx xjq304fmss9hymf je.fat $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to b f ids kf;9eor3i z2pf7(/ a,y+0fysace removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcalqu4s 59ih:rgd 4mwk ;p/kg. When 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 initiali x.axjk3 q-fnr)gf:7ly 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 ab-cx ,6kgg;u hiej6(et $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of watq-c b::-lj+(pun 5k) pzoppbber at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change o ptk6 m3 umtp2ncti0.1ne gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g oq yet:gu9k /ml :1cl)yf $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding. 52-d vfizvyc ice to 1.8 kg 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 vaporizationbp ao msr9m5/: is 207 kcal/kg, and its melting ab/5om r: m9pspoint 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 conc(e uoy8i (+a5ruht,k hrete 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 is twice that of brass. Two rods (.wi24nan pp4zone aluminum and the other brass) are joined together end to end in excellent thermal contacpwnnpai 4z24.t. 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 3.0plcjdav; .ww70ue9dip0 q/9 n m by 1.5 m. If the outside templi c;99a vpww/uje7d.00pqd nerature 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- )ehq p e k qp3lfp2qo.vy:97pu7l+wb outside temperatf 27eh7+ k9le)qpb-v wpp3 ouyql:pq. ure 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 conf7. oshx*sn+gbomg9 z2 k fwtj6mn,, /crete (6bwho7sno2jn.m,f x+ 9tg/zkf,*g sm$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 mesj; f,8tazw 0u2-y)gpt9meheat 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 lostnim1.dy )6hn/necl m ) 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, go3asoc)-n ;pgar5. lthe temperature is monitored by measuring 3;oclgnr.op )asga -5the radiant power emitted 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 ra )(bpibxme)r,diating energy when 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 i,*3eg mmpq mi*mdt* tuncpe/6w1h89y nside 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.