Which of the followi 65pirp4i6 i36pec* gbpnx0ning is the smallest unit of heat energy?

  The amount of heat necessary to raise the temperatur x9yh.lx8hsa9k * o0coe of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molec d; rjdlv/t*8g(.evmeules is referred to aslrv.m*; j(/ve 8tded g

  A cup of water is scooped up from a swimming pool of wate+,m js,b 1 xg.0;dizjneppm7cr. Compare the temperature T and the internal energy U of the water, in both the cup and j0.p7xn, iz;, jbm+cegm1psd the swimming pool.

  The internal energy of an ideal gasay1z jbpvs1 d3.-us,lz( coi, depends on

  An ideal gas at STP is first compresse gu.vhk9ssbu6e*b r6+d until its volume is half the initial volumeuvusb+bk9e 6*6.s gh r, 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 internal energy of the gas will be

  An ideal gas with interna *uruivpxp,6 8l energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drasticallr t)cp( gq,q0xnybm:,y is that

  It is a well-known fact that water has a higher sq ;+r: 0(hdw.ag oxgbhpecific heat capacity than iron. Now, consider equal +d(h ro:hx g 0.bwq;gamasses 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 :/ zn)f .hp,bfypyf6hcold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is ,n.yzyfhf/f: )p6b ph 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 liquid o:40at:h qu6 c+xoct+o/z tgestate is referr60 x::e z/+cg qhuttacooo+t4 ed to as the

  The heat required to change a substance from the liquid to the va6kbe5rt8lhs t+v3 q m5vf3p;a por state is referred8hlb+5tt v6vpe 3msq r ;a3f5k to as the

  If heat is added to a pu1vr8u 5o sjtwhj:0oo8kzv ev h1 -2yc0re substance at a steady rate,

  When a solid melts

  When a liquid freeze c30bkf4g4-62h6v inr zz kyxz4b/lhps

  When a liquid evaporaea rt1u8(y/cu tes

  When a vapor condense 5ulr.re*hxykf: jd *0s

  In a cloud formation, water vapor 6 rlwy 2bd+v2vcondenses into water droplets which get bigger and bigger until it rains. Thdrvb+2wl2v y 6is will cause the temperature of the air in the clouds to

  Turning up the flame under a pan of boi.) 7 3hpuijn/nk2nkykling water causes

  Equal masses of water at n 7dkk5vts7ny uml8h32fn t29$20 \; ^{\circ}C$ 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 collishkphn.0y+k93x8ajc.jo 8gyz ions is referred to aso g3+ c9p8k z0j.n.hh yak8yxj

  By what primary heat g+t a1-,1 aj; 1evsxrg4elcfxtransfer mechanism does one end of an iron bar become hot when the other end is pva-e gsfc e 1aj;4x1+ltr,g1x laced in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a piece r)v (q qcj-mi9r jxzn9b;iip 0d 0*st9of wood. This is due to the difference in which one of the following physical property*9)v q9r9tzj x pcjimn r i0q(bis0;d-?

  If you double the thickness obsy u)7/t h9tnf a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thickness willt9u/ bntsh7y)

  A layer of insulating materiaw kz4ic;5s(r5 xch( 4bdg xv6pl with thermal conductivity K is placed on a layer of another materialb5wr5dcp (zkh ivx 4s4(gx;c6 of thermal conductivity 2K. 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 molecules from 9 38i,hq/uj((ubycsdbrml 1x one place tuy i9hx8u 1bbr3d(j ( cml/qs,o another is referred to as

  By what primary heat transfer mechanism is a pot of water heated on a sto,z-72ar :mv ob- 6bwe klsub6jve?

  Convection can occur1mzy - ddmb; o+npp20p

  Which of the followingbl0ua7v81up d best explains why sweating is important to humans in maintaining suitabledv7ablu80p1 u body temperature?

  A spaceship is drifting in an environment where the accev;b,fx e ym+8uleration 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 convection currents bu+fme8,yv; x caused by this heating?

  Consider two neighbotar 8q ft:g.y/ring rectangular houses built from the same materials. One of the houses has twice the length, width, and height of the other. Under identical climatic conditions,yg:.t aq /t8fr 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 doubled, by what factor doerp9iy 0:; haiee dh35r7f;kv9 bdmt v8s the radid0 h8 v;9k: 5b; yreef93maphiv tri7dating power change?

  The process whereby heat flows in the absence of any medium is referre-4m bib81k6wq3 jx(0xfbdns y9qz 4+)kyqtokd to as

  By what primary heat transfer mechanism does the Sun warm t ;7tlswe tcrl0d(v/v6he Earth?

  1700 J of work is equiug h g r6+rtk (-fq-,h4j;ttbavalent to how much heat?

  16.5 kcal of heat is equivalent tozbaxkxfw5r4 / 2pse46 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 temperatur-/gc bn00nimhe 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 1l:j;0 p.s tmsrx:1rt a tv6iz2.0 kg of water, what is the resulting temperaturez altvr1m:6i1rt ;jx:s.tp s0 change?

  A 4.0-kg aluminum block i;6pt,l/- ltsr8akwr2 l,jzyns 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 materiap q1wfa.urs;bc )9*e zaj/bj6 l by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bathk0 /lojaso+fq+qn *i2 water by adding 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 m2 du;u)ml6x dsh:g:jcuch heat is added to thcu:lxd2j) ; u 6:sgdhme 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 hea) z)zzd-qdc0r ted 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 clck 0e4+g aq;8dv:uo uopper, 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 at qg(8fh3 ,o; ku) pbnxi1bl x)g$100 \; ^{\circ}C$ 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 0l sn cj- -7-0r h)c:bwz4dco e.(mnihoei b5uup a system that is thermally isolated from its surroundings. One object has an initial temperature oirbd-0cw ci 07ue lce4h-h -noj(oz:n 5.bsm)f $100 \; ^{\circ}C$ 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 relationshipsdg+zeof 3mi4 9 between various 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 vertical drop of +fog i94edz3 m20 m?

  The water flowing over Niagara Fallah(lz( x*qw- n e5lr /:y,hccos drops a distance of 50 m. Assuming that all the gravitational ener,yc *-hax/h(zco(q nlr lw:e5gy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat k6 l3qmxw9q7oloss, how long would it take to heat walx37oqw mq k96ter in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is use-og+plzk -- m;* rpnked to heat water. How long will it take to heat 20 kg of wr;lgp n --z*-+kokpmeater from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (maot4yb4ae: f 1 ejxk4,dss 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 (s +z+i 4tp -e.prdq/i hxcnx.p)pecific 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 changedy*z 1r b0vek7 it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is requ/fyxutnrb;, 0qk hq k:tb4,8k ired to melx4:trqh8 n, k bkkuyfb;/0,tqt 200 g of ice?

  How much heat energy is needed to change 10o6pk7b/ek(0(e my/ufk n3 swz kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remov u+qm9arnh pcn2**+ iremm)6 bed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcabv0;3+ verjme l/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 init8 j*gj(qvj;fz8g+9vw zd9zb tially 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 at+i69 vbvjr;2ee lta.q $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to 8yb* 0 5j t1sk onym07;gypkmlchange 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is reqa7sg/4 li4kjruired to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to changezetoge9gln;h n b72zd n, ;11f 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kk.9m*9ottqvt t)t2 n jg 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 vaporization v61 7mln r(zvais 207 kcal/knz6a(vvm lr17 g, 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 concrete is -ogdoc p 4*f dy9-hs6u$0.8 \; W/m \cdot ^{\circ}C$ 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 (one aluui -lhgqt,9r, minum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii. The free end of iqtg -r,lu ,9hthe 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 dimensa95pjt2k9s mbions of 3.0 m by 1.5 m. If the outside temperature is smb5pk9a9jt 2 $-10 \; ^{\circ}C$ 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 ouihcmrw0198kj v8kn l.tside temperature i.8wkk 8nj0lcv h9m1ris $-10 \; ^{\circ}C$ 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 inu6 8ryq 3hfv0m 1.0 hour through a 2.0 m x 2.0 m section of concrete ( u vy86qf0h3rm$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 han3h- jj: 2nwg pcbnxi9shx- 6la9 1:peat 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 tempede d8+lp)t shc*r(tl: uc isd1v)q23lrature 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 ogl;0 ,vn gb5avw3 lo4i isu4;td48, qdhp5flis monitored by measuring vg8qwblu l5 vnf,dtgao is 4di 0phl;;5o4,34the 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 humu y)kthn 8(:pdju(e(q an body radiating 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 inside a solar collector (effective collection aret5 9.pugo gask:8*wz 4 9 uz5zfscjb(ea 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.