Which of the following is the smallesggzm2 gp3,cs*b88yz(i7ue mwwlb3 o +t unit of heat energy?

  The amount of heat necessaryau:2/noqz f4z 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 molecules ibnk co13+l 0mes referred to mco3 k+01be lnas

  A cup of water is scooped up from a rl.n w4yv((b tswimming pool of water. Compare the temperature T and the internal energy U of the water, in nb l(v(r. twy4both the cup and the swimming pool.

  The internal energy of an ideal gas depends gsig ( jck9n00on

  An ideal gas at STP is first compressed unji :(7vm shqq/ ec,8iftil its volume is half the initial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of (ifm8s:7jvq,hce/iq 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 intepvqp1e: irkq4c;e s 8-rnal 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 xd2 qvgaz bu (j4w01m1r(k+acdrastically is that

  It is a well-known fact that water has iukmp 98n--ahm88i l. e3ktgs a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equil9p8s-thn -ui.amm8 k 8k 3geilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of applq ,rtp*e4 5 hot piece 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 ther5rt4pe,*p pl qmal equilibrium?

  Phase changes occur

  The heat required to change a substance from the solid to the/r7ujpgh14z(f gd e:8c0tcc71 ovvn w liquid state is referr7wc 1z (cohvut0fe487gcdpgvn j1/ :red to as the

  The heat required to change a substance from the liquid to the vaq h*m qbozp,,e0fat;y 7y;z6epor state is referred tb7;qzh z ey,eoam0;6qp,fy *to as the

  If heat is added to a pure substance at a 5ye3jd xml v87steady rate,

  When a solid melts

  When a liquid freezes tkf;yn56y)fl qzln s /9-j0wc

  When a liquid evaporateso1 o4pf*)s l mt.d)zhu

  When a vapor condenses ua0mk8wj+ uq9

  In a cloud formation, water vapor condenses into water droa6m3sz z;r50u6xt iw aplets which get bigger and bigger until it rains. This will cause the temperature of the aiu56mt;a3zr0wzi 6 s xar in the clouds to

  Turning up the flame under a pan of boiling water caus jr9q8/ y1rytjes

  Equal masses of water n 8xkif7i0enh gl3+v/at $20 \; ^{\circ}C$ 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 collikg,/xrfp5 ryf1 6sm u(sions is referred to asp5kr ff s/g1mux,yr( 6

  By what primary heat transfer mechane,/ch )5 nq:*n2prt2u moety pism does one end of an iron bar become hot when the other end is placed in a fleem5*: 2ut2p,p/ oq)cnnhyrt ame?

  On a cold day, a piece of metal feels muc;6ez q 1z(siwch colder to the touch than a piece of wood. This is due to the difference in which one of the following physical prz(c;e sq61zi woperty?

  If you double the thickness of a waweu k8+.;jl 65fvi xr2m)rkrxll built from a homogeneous material, the rate of 2r 5u8mfrjvw).ex ikkrx;l6 +heat loss for a given temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed oncb 3w4u8y gya/ a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effg3 c4ub8 y/ywaective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecu. ho r 4yx2p*7yk4tpep4s9bnfles from one place to another is referrsfhy 94p*pe 72t4ro4kby n.pxed to as

  By what primary heat transfer mechanism is a pot of water hex.yg 2w6b6ma mwpx2b :h gt7;fated on a stove?

  Convection can occurbt fyf)sm e7t;7 *ng(qtk(8 t8alphu5

  Which of the following best explains why sweating is important to humans in mkpf0sa /e;/qtaintaining suitable body0qaeksf; t //p temperature?

  A spaceship is drifting in an environment where the acce*g4 ny6rql m1k+dwd v*leration 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 caused by this heating?q4vdrywm l1+k* g6n *d

  Consider two neighboring rectangular houses built from the same materials.pw)gz s17q)kqibg(n + 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 cold day? Compared to the small house, the largeqpk7i+w( ) )nqs z1bggr house would need heat supplied at

  If the absolute temperature of a jrs t 5o5qq3(lradiator is doubled, by what factor does the radiatings5qjrq lt3o5( power change?

  The process whereby heat flo q* ipnq*c.y;ows in the absence of any medium is referred to as

  By what primary heat transfer mechanism does the Sun warma0; i-9*uxyq,f94soenm e 5 ksun+acd the Earth?

  1700 J of work is equivalent to howx)r 1agno0(-fz0 slh8gkw2br much heat?

  16.5 kcal of heat is equivalent to 21 y)vopx6yoq6*az o jhow 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 kv4*y *gqz;1vndupze)wir 5. of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added(-4 zp7 esayrc to 2.0 kg of water, what is the resulting temperature chanyzs7 4(ca erp-ge?

  A 4.0-kg aluminum block is origina ,f ubcvt, c4lil,v.:ully 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 mao a9xh1ec0u.c:s6la aterial 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 m w3kotj2s*m6vd /j3ywater 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 g z4t 5zil obadr(2ai.o8 2gi*of copper. How much heat is added to the gear if the temperai4gozlb ( rz 228i*at aio.5gdture 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 heatz7,r (o .6vzuk b)pbi 6e12a 9elmzxlsed 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, initially at 3dw7p5 extyo0$95 \; ^{\circ}C$, 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 7 ibroz08aj 3r$100 \; ^{\circ}C$ 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 (yzw5ht)i ;vt -qwh3mthermally isolated from its surroundings. One object has an initial tempe-q )wmtt5z(hhyi3 v; wrature 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 attempscmm88emjsx2p,s 1-uf/ju t( ted to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a wcxus8 ujp/m,me1( m-2 fss8t jaterfall 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. As x; stgc:qxo(0suming that all the gravitational energy is converted to thermal energy, by what temperatuxx:tg(oq;0 csre does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how long wouldqc0r;/r 6:wdfcyiis 2td7 em/ it take sc td i0r2iwy/r:m6efq7d c ;/to heat water in 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 heat 206 1qk8kioir( r kg of w oi86kr q1(ikrater from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mas hu 79a(cono o(8tp tv5fz7 c2ozff/ v0+jmv0ss 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 kn7w 8gc-p,mw jh /2ui ;6bblnlvife blade (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 stefup ( 23kl+3:+ bwp7cl,hwp g me75lajbqe,w fam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How 6f54emr * ee o,tkhi9smuch heat is required to melt 200 g t f,*emie9shke6 r4o5of ice?

  How much heat energy is needed thb d+a/zpn2n -o change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be rj/f4gt x b ms+:ycw06qemoved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When 50 g of ice at iiu5 ,2ljf:a/v4yuzb$0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water initially e.z.mawkh :8b.s8 yly5 lk: uhat $100 \; ^{\circ}C$ 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 at2 bu3zl., (q ,wfmptva $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to ch nkhx qx-hq121ange 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required t s8 tt2*cl/uaut11r/md 37 t wnul0ccto change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is requ1n(gghq dz97 0 somfs8ired to change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tch nx- *wj*0 o,w d2jhbpgl42dea by adding 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 leao;ewds:s1 /xjd is 5.9 kcal/kg, and the heat of vaporization is 207 kcal/kg, and its melting 1w:jd/x;e sospoint 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:ujb4h(lfk 0 u1vd3ihrete 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 0lp17ufs6 rr lof aluminum is twice that of brass. Two rods (one aluminum and r061 sllr 7ufpthe other brass) 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 has dimensions of 3.0 m by 1.5 m. l,l 6)dido2df c6 f2lx If the outside temperatlo6 xf6,d l) f2c2dldiure 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 bykg7k6d4a ;gxm7e ur yh(. wox1 1.5 m. If the outside teygmw6e;71(a xxo4 rhu. k 7dgkmperature 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 flowokmt;cg j t ttk- cpr 277*w96+n2rhbf in 1.0 hour through a 2.0 m x 2.0 m section of concrete gpfn*+2ow ;t2rbchrj t7 mk tk69-t c7($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 u9 wy 122tz kf6gk(tcntransfer 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 temperature if 4000 kcmi u;u(f5iuaz /en1a, d/r(vval 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 tempe/v(fj m,ev e9)bze ,pl;i,hmwu1 x2 x:jcv/adrature is monitored by measuring the radiant power em m /jimcbe,x,f/h )9de1xzw: elp ;vv2v u,j(aitted 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 when it or-am0/gqg r2is 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 (erbr(jlfix+,8;8i;bn: mmid iffective 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.