Which of the followixbcpgsk4-(o:9( io vx:d )v rr qwgm3;ng is the smallest unit of heat energy?

  The amount of heat necessary to raise the tempew+ 6e+mjppv1hrature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of injd .6vx p7jjj-b6tkc0 dividual molecules is referred tok0j.c7j bv x jp6djt-6 as

  A cup of water is scooped up pc.)b82.pk+ l ezok7ajea0n 7edq s.l from a swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and the swimming aea zpc08+7elbqps). . 2.kkjl nd7oe pool.

  The internal energy of an i3w:sagmb8 o(qx m(td;deal gas depends on

  An ideal gas at STP is first compressed until its volume is half the initial z*:xy(l )dw l3d:ufdk volume, and then it is allowed to expand until its pressure is half the (udlw fxl*dzd 3yk):: 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 3fdttvf ms(r c0+0y)dnu)ip)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 drastically ib8 )ct-0 befyisn+ g*ns that

  It is a well-known fact that water has a higher sojbjjpf842t: 7ejnm gka / lfy0n 0q-6pecific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibriu/a-l7m0p e80fqo2b: jyj6njf 4g tnkjm. 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 piec e7ob.tj,fevjs.0sl2b3-s vh e 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 object3b2 l -h ft,oesejvj07v.sb .s 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 fromhb ec cr4 c37:(titp1g the solid to the liquid state is referred h rcb:cptc7t1ei( 43g to as the

  The heat required to change a substance from the liquidkkz/.iy0. fq w to the vapor state is referred to as . k0k.iy wqz/fthe

  If heat is added to a pure substance an4to3 v: (h7*rzzss3sy:nlbpfu 5 g+yt a steady rate,

  When a solid melts

  When a liquid freezesz5jghw q : hl8*6p2epi

  When a liquid evaporateslf*atmgx08mm4 dussy34; m6cx;g a(:f z mk8t

  When a vapor condenshkh 9lh:7nmvc td- ug-n(4wq6es

  In a cloud formation, water vapor condenses into water droplets w 98ev8omxp3 a6r ns6y0 n6u0wfvrm cg6hich get bigger and bigger until it rains. This will causeena fmprr n x86m930ugcv8 y66v0s6w o the temperature of the air in the clouds to

  Turning up the flame under a pan of boiling water (0cqr ;k0 pyt*oq f9/x1(eot vq:snaacauses

  Equal masses of water yp8u(x7k z-w b(rj-2g2 mfdzhat $20 \; ^{\circ}C$ 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 collisions is ref.b as,m.6-r1s ovqri oerred to as bi1oso v6a qr-s.,mr.

  By what primary heat transfer me-1 xb7api,b( 8:sf9:fp qesm:vabrwr chanism does one end of an iron bar become hot when the other end is p f8ppsa 7-mearbf:ivs(1 q:: b9,bw rxlaced in a flame?

  On a cold day, a piece of metal feels much coq(jsb2ns0sl *( vm6o klder to the touch than a piece of wood. This is due soklsmv(j*62 0 s(bqnto the difference in which one of the following physical property?

  If you double the thickness of a s.jfw7z .uuzrn 0hs(3 wall built from a homogeneous material, the rate of heat loss for a given temperature difference a .r3nhfs.(z zs7wuu 0jcross the thickness will

  A layer of insulating material with thermal conductivity K is placed ontd r,94igq ex8drq 15n a layer of another material of thermal conductivity 2K. The layers have equal thicknesse ,x8q5tdi qd4rnrg 91. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows byy-hb nq rz- li6xl0w-6 s7qolblh+p0 9 the mass movement of molecules from one place to another is referred to ah9 l-lbh6lris0w0 xnoz6+ b-y-7ql qps

  By what primary heat.v nh e7p7sqo6 transfer mechanism is a pot of water heated on a stove?

  Convection can occur6gv,5rnsl+i4( 9tuhgi f*wqi

  Which of the following best expla,l4 ewty9vpnp 79 2u6s;hxc khins why sweating is important to humans in maintaining suitable body temperatuw 9p2yxvk pnh;6htcus479l,ere?

  A spaceship is drifting in an environment where the acceleration of gravityloqvbt eg;.-y2 qj07+xc pej6 is essentially zero. As th+b6pej vy.0geqlo j;7xt-q2 ce 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 builtj b2-wvg-/wou from the same materials. One of the houses has twice the length, width, and height of the other. Under identical coj/2vbu-gw- w limatic 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 doubled, by what factor doee-oldbcz+- a *s the radiating power change? bcd-*alz+e -o

  The process whereby heat flows in the absence of any medium is referred to as14wcs6a.j 3-x w;eceqarz k- u

  By what primary heat transfer mee(hv:dl) 57ggy 4)o s2uscqdlchanism does the Sun warm the Earth?

  1700 J of work is equivp155m ru(hgc ib a3br*alent to how much heat?

  16.5 kcal of heat is equivalent to how much wup1jzt2 gwmu e48gn* *ork?

  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 te) qc e,mnh(upz(-rbh (mperature 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 waterzl.s2l zhi :a-t cy qpghl4+1piw6d;/ , what is the resulting temperature zp:l aw 4 /ih- z2qt.+;yll 1p6scgdihchange?

  A 4.0-kg aluminum block is of g(e0mdoc8la), xu1 eriginally at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises fxg(y3:o,zsyjk2u 5 4 1phgoathe 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 h8bnp .g-(gl )9 7pu xodny)eobl09tnger bath 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 much h :a)iy74f qpfi/ +c.wffl qi6geat is addaw: )lffii+ qq/gpyi. c ff674ed to the 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 met3 rgiqwr9a5 7yk*0(3unri (e f c:bniial 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,:iq(s/ sj*0xq h-6d1 sezv zs3yt/md v 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 as 5gt5 -8tr5xkezmh*cbv+ sscv;;q 3wt $100 \; ^{\circ}C$ 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 v .6l jq4j5*vxjiecgv+)yp9 ysystem that is thermally isolated from its surroundings. One objyc)4j*jypv5ex .9 vi l+6qv gject 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 occf6 a:u2 tkda22*f 66g xqatJoule attempted to explore the relationships 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 with6c2tcxf q:d*kagft6u a62ao2 a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a distanc+u7)a9h kk caz1 7(b*jw 2tz 1pkmdnhne of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what temp nk7u1+k)bwhz kan hj dmc1tpza72*9(erature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat (:5u zk e)d*my(,(hox ifjl tjloss, how long would it take to heat water in(ol(f zdk m*t:xi5)yuhjj,(e 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 20 kg 80n a *ho-4njb-grkaq of water fromj4 orkn-gbq0 a*8n-ah $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (masa)7lw;nq: 30vgecko / ii* bl*ccttp9s 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 (speci*gqizu-e-0 /j*6:.)k bajnyabkax . wu q dx2wfic 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 ste2q8sf 2aolc m:am to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required tdbco 1*d a 3nsa6ym5)bo melt 200 g of36 ds1ybo5nmda)b c*a ice?

  How much heat energy is needed tol2 q ,u8su; rq1 n3mpp/*tbhoo change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to bed)(m,p/wn;rh m:k 0f lzdq+kt removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. Wtwsf31)prtyj3d0ixwsc 0d 66hen 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 initially c b, fs:5zrf0 x2k1 nzps)rbab 4)23(myneqodat $100 \; ^{\circ}C$ 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 awt vf ++k-rz-vt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is neededtk f6cbw6vaka 1se b6( 72wko3 to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one8 u7wg zfv*u3s gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to p9a0fqd bzcc zdob52;zh *6+ychange 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by k0(oatfc1y hv+a: gv)lu e7e(5uu :jzadding 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/2 qa vfr3slk6/ t+thk3kg, and the heat of vaporization is 207 kcal/tvk+ qht2/lfa33s6 kr kg, 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 i i 33fjb+s5tiis $0.8 \; W/m \cdot ^{\circ}C$ 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 y ; x+l;mdqgs7 yv5ts;rods (one aluminum and the other brass) are joined together end to end in excellent thermal contac yy;v+;tx5sq7d lsg ;mt. 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 al dbi 9g2w8-zrjes*8 thick has dimensions of 3.0 m by 1.5 m. If the outside t-s e jl*ra wdiz8892bgemperature 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 dimensionv ku bf z 9il:v(u;645myruhz7s of 3.0 m by 1.5 m. If the outside temperature iszz( 4ifbvu k:hmu9luv7 r;y56 $-10 \; ^{\circ}C$ 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. q s0sl6d*zum3sw,y u)9/flg()jgk p zb, gtm+0 hour through a 2.0 m x 2.0 m section of concrete (6sdfqb) u+g0gz(,kjuzyw ps m*,tm/sgl )9l 3$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 cad/rw4u q6 3whwl 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 kcal of heat is lost thro.qdig k5g./)kcx4 z anugh 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,whwidsu gar9.h 3) ,4 8jct:tu+(yueg the temperature is monitored by measuring the radiant power emitted through a sma4iuchd+ 9t,a:.ut)gj3 (wwuehs ryg8 ll 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 bodrt1 (a epkn;nu zj-)70cl c;oey 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 szfn* q;vo),ffoyx+ t+olar 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.