Which of the following is the smallest unit of heat e/ km 09jf dqut6wo8/ rlf0 ms6gq4sos*nergy?

  The amount of heat neces cyskog,: 3v0ysary to raise the temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecule( wsm0),yuzur s is referred to z uru)w( m0sy,as

  A cup of water is scooped up from a swimming pool of water. Compaeqylqk c 7u1wq;0,cu/ommm6/ re the temperature T and ;cq lmm0/6 ,1wqc7e ou/ymuqkthe internal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas( s-z :yno1z z1ig:gtjxy)..vrte2zz depends on

  An ideal gas at STP is first compressed until its volume is half the inif4 cvmo.5v3jb tial volume, and then it is allowcb m5j3.fvo v4ed 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 internal ener 4ofld 0(-h9f l*umzitug 2pk5gy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drastically is th v s k:tdo jr6azidq*s4;;n4:nat

  It is a well-known fact that water has a higher specific heat capacity than ir2 8exp,vmjzr w6unz, *on. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same wn2,,z8 z pxmjrv6*ueamount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of a hot p 8i/1pet, s:hsjkhj0 diece 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 experiences the greater magnitude gain or loss of heat during the time the system takes to reach thermal eqh 8/js1:k ispth d0e,juilibrium?

  Phase changes occur

  The heat required to change a substance from h1nr gpyxgm40)xitd-j. 8b 2pthe solid to the liquid state is referrn4mxg rytid 8p20 hjxp -.bg)1ed to as the

  The heat required to change a substance from the liquid to the vapo;3pr*+zzet -gp /ehzo7ghz l(r state is rez+rggehh (p/t o-p3z7lzz;e*ferred to as the

  If heat is added to a pure substance ka.r fa 9t8ml *2usas(,hnnmfg53v :c at a steady rate,

  When a solid melts

  When a liquid freezes9yma a ze; -fw+ 0hhz06o+gfwo

  When a liquid evaporatj :3ngsiw:j* yes

  When a vapor condensesyl-vd3icykm, . fg8g.

  In a cloud formation, water vapor condenses into water droplets which get birj54e*ab+* d5rnfdp u5k+g sxgger and bigger until it rains. This will cause the temgjds 5f*rr+ak+ 5dp4b*ex5nuperature of the air in the clouds to

  Turning up the flame under a pan of boiling water cauck ow)6t 8u(9gsgj:msses

  Equal masses of water at -(q0w eg7 wna6qlzx4z $20 \; ^{\circ}C$ 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 molecwh h l,1jg.:fvular collisions is referred to awh :hgfv.1 l,js

  By what primary heat transfer mechanism does one end of an iron bar becomeu6xkdy7w(2 /y -w m9*iktzpf o hot when the ot(d yiw*2ft-z6mxkwk79 yu/ op her end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a piece of 0w4,aq nd/ q,om4rzee*gz*kfwoodan,e k*g zqo4q*m04e wfz/, dr. 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 material c5d7lm seno9uo;:sqypt 9+ve2ea0. w , the rate of he m27lwu5+ 9e:0vq.s9 n;epocsytd eoaat loss for a given temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is pla,u(2of d pmii,ced on a layer of2(umidio f,p, another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat d)p:r ccj;o-an-4 hgj*f+h0 mi q nlv*flows by the mass movement of molecules from one place to another is referred to asp4 *orf:+ nca m0h;-n- l vhd*jjcg)qi

  By what primary heat transfer mechanism is a pot of water heatedin6o9p m3e. 5vb.tk ri on a stove?

  Convection can occur+xl au hii,u;rj4prbu e51u8e )d4/t bq7x-x j

  Which of the following best explains why md;qrpq62z w7sweating is important to humans in maintaining suitabq rpw7m26z dq;le body temperature?

  A spaceship is drifting in an environment where the htbo7 ozx x3kbu*6z3g8 k5o/sacceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what t7bko8 oxk 3zb6u35 /g*oxhszis true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same y; 2b rk+hpr8lmaterials. 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 c+k l yr8;r2hpbold day? Compared to the small house, the larger house would need heat supplied at

  If the absolute temperature of a radiatorsk7sbv i- /vc2vr7otezh 7)1b is doubled, by what factor does the radiatings-rih vzob7v7e t v2k71cb)/s power change?

  The process whereby heat flows in the absence of any m ),hhtdha4w-vedium is referred to as

  By what primary heat tral* zohig f33oyd4zw -:nsfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how muq c3pg w1 u;fi0m9 .jk/cu-q9id)r cqich heat?

  16.5 kcal of heat is equivaumlz 2); tixh8os+-nulent 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 neede(k5g wjj /tt5vo9+ sgvd to raise the 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 is th /t4 f*e;/4ecywkrzh9den h6me resulting temperaturweec*f/t6h;y4he /4dzmkr9 ne change?

  A 4.0-kg aluminum block is orig h;q e)78f v,wl9sbgseinally at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises theig/s:a8- 1 lvwdojg1( tazmk6 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 adzunbcusx*hq* :x dx91457lg pding 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. tqghn3g,wf, 3How much heat is added to the gear if the temperature increases by33gfqnw h ,g,t $35 \; ^{\circ}C$?

  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 me;c23q 6d2jl /bmkk7 mjeii 8lytal is 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, inx3 i .xvox u -gv*)x*+cm(toeeitially 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 38cdlf5o,c6)2( x 5h k k9pxuc l3;ymhheyxgeat $100 \; ^{\circ}C$ 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 its t,r,o) )fhokvo; 6b.gd j:kv zsurroundi:b)gv,d.t 6kh) v zj;o o,kofrngs. 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 betmo5w86foqs 3 yween varioosf y w86qm53ous 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 20 m?

  The water flowing over Niagara Falls drops a distance of 50 m. Assuminl2z02roq t5 gqg that all tg0o22 lrq5t zqhe gravitational energy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how long wox 3z :hkgo+2mct du6l.o z6ue,uld it take to hetco +3u ek.lu, h2dxzz:og66mat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat wnd295vh;be2p. de gsdater. How long will it take to heat 20 kg of water fp2e ;2gbvd 59.ed snhdrom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000 g,(6 ur-xn 3waxh3jdtw lt0 :i5(r,zjje $c = 0.22 \; kcal/kg \cdot ^{\circ}C$) 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 ql5m8mw9gu w4 vwi y/1blade (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 change it ujl/bk230/zm mo7tv wto liquid?

  Ice has a latent heat of fusion76 esq kv:ic1d of 80 kcal/kg. How much heat is required to melt 200 g of ick i1:6eqvs7 dce?

  How much heat energy is neededy2gaf+/eqlx:ad rwvzy 8923 h to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remtt/vd c 8qt52fube4 9xoved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of: *;5h-j 80x;xwu 8dxv exi d+yykpyuh ice is 80 kcal/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 initial, ovdohwfl/1gh0 ( n3cly 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- *fv)p.snnlq $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy i+w:es be 7k hmxqna:2*tsy+d8s needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change oq2 +,sp;rcaorne gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to cha(/ l ynsbn0i( )n+hp*mqgz- ynnge 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by addq ,f1djz, 6lbmd;ez)fsw pp ;-ing 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 vaporizarj zi . ltkan1el5;uo19jbm jq)8(*x b +wb9rztion is 207 kcal/kg, and its melting poin +)191xrwtubjjzebl a nrb zloqij.9(m8 ; *5kt 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 concckbe1+w l(1vxn2apo kb +n*ji(+j b;jrete 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 vb3k o /31w0wjqol0ao(one aluminum and the other brk 3 o1o30oqjw/a0l bvwass) 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 thick hwt v/*p4v lj1pas dimensions of 3.0 m by 1.5 m. If the outside temperature i*41jvw/t plv ps $-10 \; ^{\circ}C$ 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 dimensaop a,f(,qkgb :3r y/zions of 3.0 m by 1.5 m. If the outside temper g bzo3rqak(/afp y,:,ature 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/q2/ / vrhgidt 2.0 m x 2.0 m section of concrete (//tv q2dghri/$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1,00r1ar 9c/b*/z (ybb5 wzkwwqp )0,000 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 temperature if 4000 jut-ghye51 l2 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 qg0 vi0uy gc)m8pui25q1sj.t refining steel, the temperature is monitored by measuring tg0vg.i8u0 qcpq u5s )ijm12yt he 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 bj*.dez:ua6 q4gndpsgp+ p23a ody 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 3d3kfx2qamb 5a 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.