Which of the following is the smallest unit of heaq/nd p 8) dsngqk816w*jlu8jbt energy?

  The amount of heat necessary to raise the temperature of 1 gram of water+n.is etr+-,:mayu f9 5quva s by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kineta xx r0,r -knu+ et5pn4-qs8p5jq(ogfic energy of individual molecules is referred to at0r+ xapr-s n4o5 pu-5,8 ekx(jqqfn gs

  A cup of water is scooped up from a swimming pool of water. -o7115zawmj5 xv klpjCompare the temperature T and the internaj7wkl 5axp5 1-v1o zjml energy U of the water, in both the cup and the swimming pool.

  The internal energy of afa 4mj qk8) /u4ema5vhrn2ec/n ideal gas depends on

  An ideal gas at STP is first compressed until its volume is half the i /ox5.1ej8vme: m4n(xxg l hgvnitial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of thi le1/xoxn.x5v4h gg e(vmm8j:s is done while holding the temperature constant. If the initial internal energy of the gas is U, the final internal energy of the gas will be

  An ideal gas with intern8 k4i5h6eqod+-u aiv)8qx adaal energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatur-w4pl( ojm:* j6m xjgnak2h.ekjo 4,ues do not vary drastically is that

  It is a well-known fact that water has a higher specific heat capacity than ir*y / ihjs6rgr:on. Now, c:h 6*j iyrgrs/onsider equal masses of water and iron that are initially in thermal 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 and a :) w/mitund*;: mq0 vfv:den ncold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of al mu:: /w*0 v;:nenv )ntdifmdquminum 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.vy)tu o ;u.xz the solid to the liquid state is referred too vz;.xu)yu .t as the

  The heat required to change a substance+1d78dw yln yf from the liquid to the vapor state is referred to y1ln+dd7fy8was the

  If heat is added to a pgtc r*/( r1cunure substance at a steady rate,

  When a solid melts

  When a liquid freeze.*t,r g egm7ym. aq/nns

  When a liquid evaporatesxmw so*)s3my:9v/ nec

  When a vapor condenses q0r zd:8s-jpc

  In a cloud formation, water vapor condxj yrx118 n,lc6dq8rphc 3dmm5s.zc ;enses into water droplets which get bigger and bigger until it rains. This will cause the temperaturcszq1mdh.xxdjy cr6r8 ,nc p8l m31;5 e of the air in the clouds to

  Turning up the flame under a xwji1;v-f- rc ztie-k*8qj7w:t mva9pan of boiling water causes

  Equal masses of water gkuq 9q94ursscj0 ru;ry25 9 aat $20 \; ^{\circ}C$ 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 i.gz-qz8pwp )o+*wgp oyura ,wn )6j/ of molecular collisions is referred to aow) i,o/6p-pjw+ .az 8wng qg)up*zr ys

  By what primary heatexudr*t +x4 h2 transfer mechanism does one end of an iron bar become hot when the other end is* thr xx+2ed4u placed in a flame?

  On a cold day, a piece of,b 5 hdwqzs mb3)y1onv:65 wzb metal feels much colder to the touch than a piece of wozb6n b1oq m)y:wh5z53, vb dwsod. This is due to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous mtn)o s103 9y u 3rieasc4ar.4ndfl0 bjaterial, the rate of heat loss for a given temperatu3 recit)bds00sa3o. 4 j1n9nyra4 flure difference across the thickness will

  A layer of insulating material with thermal conduca23p1rna .sn,,s(n2ai eudketivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. Whkdais 2,3ae.rausn, p n2n(e1at is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement 9g.szgd:i5xzqe,y( j 4vivq1of molecules from one place to another isgzv(iy4 :jiq1 9s,v. xq dg5ze referred to as

  By what primary heat transfer mmcxrw.w .c*);yi+)pxp9bth k echanism is a pot of water heated on a stove?

  Convection can occur udx mp2+g7nj4x)9+xm8lr)a p fcp/ki

  Which of the following best explains why sweating is imp9)i/bqdo l1ef-1 u z)trhdx+ tortant to humans in maintaining suitable bodbhfutiqet o)-+d11rz ) ld 9x/y temperature?

  A spaceship is drifting in an environment where the accelerat-)c z4dlgx,8m(y ,zyzkxl y 0rion of gravity is essen,zrlcz m4dx( xy -0yzk)ylg,8 tially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materials. y+p ygnk+w.8 o One of the houses has twice the length, width, and height of the other. Under k ywg8.o+pyn+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, the larger house would need heat supplied at

  If the absolute temperature of a radiator is n9wj9czy /u5a*qj-r 2 alm6kl*gp:a mdoubled, by what factor does the radiating power cplk*:a 5c-gu 6a9 zwmaml9jqj yn2r* /hange?

  The process whereby heat flows phu1 5/o d(np;gf (spein the absence of any medium is referred to as

  By what primary heat tofx2tha0,azv8/ v4pjransfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent hcunjk( ie ;330v;rdrto how much heat?

  16.5 kcal of heat is equivalent to how much -k p(dz.qqk up,zl0cvq q.;v4 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 j )4d1sr+ x6p0cyggjk.h3 fzjlov b9.lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added t q+fz8dho8q5n gl d,v7o 2.0 kg of water, what is the resulting temperaturlvh fd7gz,n8q5 +qod8 e change?

  A 4.0-kg aluminum block is originally 6u5l,fgsjho t4:uk/b 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 kdk3pcr z) r4d euo li5/7.kp3ng 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 5.0 L of water ps r 8myqn8cd2/r81ezat $80 \; ^{\circ}C$ 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 cree* +nri3jpf7z.rp ,mu/(i topper. How much heat is added to the gear if the temperatu fp (m epr+ueir,3/znj i.r*7tre 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 toj r+ q:6tyit+k3x (nfk $100 \; ^{\circ}C$ 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, initiay3 r,jbtqp ssq n6l0,fm2p5- clly 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 ii 6;-aorrp)eat $100 \; ^{\circ}C$ 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(1) s0cl o;zp;cpsbl/yl 7qoizs0u 0rystem that is thermally isolated from its surroundings. One object has an in bp(/o qc0p0iz1 lsos 7cy;s;uzrl0l)itial 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 vaw2 +cz 2ut9 myigm(qfb:88bddrious forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What ma gd 22b:8 dwci z9bty(f+umm8qximum temperature rise would one expect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a distance of 5uz, f:mq:wp(p0 m. Assuming that all the gravitational energy is cp p,:qm z(u:fwonverted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, howo6wauus/idi /e/* a:z.60k leeq4 mlq long would it take to heat water in thise//k.e: 6u qiql/i4ea6w a0zmos du*l tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How lon8 9a/w uwb:iy,uqqi4b g will it take to heat 20 kg of water fbui,q4q aww y89i/bu :rom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mas0-b yoe91dc bds 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 heati +lm3r9 2qoy: lc.ssq = $0.11 \; cal/g \cdot ^{\circ}C$), 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 siugiyi+yn .-9b5sqeq w,o27 uteam to change it to liquid?

  Ice has a latent heat of fusion of bel5d*m2 5i2u7z0g pe/nh ol v)utg2l 80 kcal/kg. How much heat is required to melt 200 g of ice*n 2bg0dm lth ov2)2e/u5g 7lizu lp5e?

  How much heat energy is needed to change 10 *k sdyrwoqtj:f) 10y (kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed 9u3nm 9fo2u ieenoc/ s/vhk1-from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kcjhz 2513:oob* zg fiog. 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 initiallx2w my2z6bbtvtq(v.lc kp6;g9b 01 why 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+dvo o5a,mwz 6 aq:*g/wlu+jt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg:nwvgi(4by q(9crl8 m of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to cl3upsnr9) ctm9m 6 jv2hange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to changnu*6omq/v v: de 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg of hot tea, .tr(0xeq/9um foqi,cri1 kw9 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:17zl i.+b-t:relq o qeml 9vj vaporization is 207 kcal/kg, azr- o e79bqlv:lql1.tjim:e+nd 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 concrete .q0deg i ;kr:aupvb tti5w2)lz ;r6,/rc smn8is $0.8 \; W/m \cdot ^{\circ}C$ 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 xs20qpf o0/xv* ;9vd, enwwrn aluminum is twice that of brass. Two rods (one aluminum and the other brass) arev0*f9 ,w nd;ew0 p/2qosxr nxv 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 thick has dimensions of 3.0 m by 1.5 m.*zgjlsieu, zd +bur3,,wq( cj3):pnl If the outside tb, ) (ru3g3+n zlu :jl e,zqidcsj*pw,emperature 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 dimens4 pc+sw 6-faajions of 3.0 m by 1.5 m. If the outside temp-6 a+4aj scpwferature 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 sectioo*hq5zdsb c9 q2:jb+xn of concrete sqcjh q2+5bzb:9dx* o($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 heat through e5,9eia gnx,; m)xhs za $2.0 \; m^{2}$ 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;b0wdxilxg : 1,.n sez 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 -uthr /sihr,em a/ 2q3monitored by measuring the radiant power emitted throqs urht a,i2 em/3r/-hugh 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 when it z n0/ yxr2n7ty4bd3cuis 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 inside a sol .48iuydwr2zyar 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.