Which of the following is the smallest unit of heatero8j/ g6i urbj2q;qx8nh92w; xhco1 energy?

  The amount of heat necessary to raise the temperature of 1fk,x m6hb o;)4twt9*n qcic.l gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules ir9m;*eu fm4g( rt+okh s referred to ask 4 m;g9o(rft+ rm*heu

  A cup of water is scooped up from a swimming pool of water. Compare the tesxlq0 amz-g l1 /,e2yg,sucm1n::zlwmperature T and the inters 2zlusm ml: a,qwzg11 ln/:c ey-g,x0nal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an kef7y 3 du *+u7)vlh z5ysgi5lideal gas depends on

  An ideal gas at STP is first 9 e4xf5cld;a;yo g(kz1,nebqcompressed until its volume is half the initial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is done while holding the temperatuzy94e(5b,ndf1o q;lc; geka xre 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 enew 0h m3wqk0:z s5 v 1p8:ffakmpp(teg;rgy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary dracxbi:, d6l5)ypzyt 0 sstically is that

  It is a well-known fact that cn q 4y3y7+(b(msqtf uwater has a higher specific heat capacity than iron. Now, consider equal masses of water and f(tqmyu b7s 3y(+qnc4 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 ho(l1:dskjl g h7 s4uimoq9:sf0 t 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 takes47q:k9 lihgl:j mdfusss10o ( to reach thermal equilibrium?

  Phase changes occur

  The heat required to change a substans 1b46lh +v h.4,xlqf bc;yzd7e/uqda ce from the solid to the liquid state is referred tfbhy+ a.s d7,1d4u /v4qcehlbxql;z 6o as the

  The heat required to changnex6e mfl2 m;t h+-,(jurimzs4.vao ,e a substance from the liquid to the vapor state is referred. ;,e4lv6jemf,2nmisu- xz mo+ ( hart to as the

  If heat is added to a pure substance at a steady ra(ibime8c0 c;w te,

  When a solid melts

  When a liquid freeze e/xzgu+/tj:js

  When a liquid evaporatwf+q6v izw3y/v6s d/ees

  When a vapor condenses vsm vj9v.duug3+l+ -xo:lim8

  In a cloud formation, water vapor condenses into water droplets which get -;vt;qroht ;uj 7;-ufn q -maebigger and bigger until it rains. qt-;;qv o rmh-nfj;u u7 -a;te This will cause the temperature of the air in the clouds to

  Turning up the flame under a pan of boiem/7gg0qb v n29n)jg t1wbmowt/ w2v:ling water causes

  Equal masses of water afuz uyeu l*2k2-e :nn0t $20 \; ^{\circ}C$ 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 mole8lack m0(x+r/li, +l hm9o0txnuf70k,b kz gn cular collisions is referred to aszhmn x+k0+f9lbc /ou,xi,(80lg7t rklmk n 0a

  By what primary heat transfer mechanism does one end of an iro6m6/1tr r7tp h5jjwj6be6z-t2d a rtbn bar become hot when the other end is placer t1 mr2wehpjt /66zt-r d6j5baj67 btd in a flame?

  On a cold day, a piece of metal feels much colder to the touch w fjd3*g(aojp: to ;g.hxc0/x than a piece of wood. This is due to the difference in which onf g *c0ato. jxx:;p3/wjog(dhe of the following physical property?

  If you double the thickness of a wall built from a hwb n0coik u78 qfugd99 u9t,a(omogeneous material, the rate of heat loss for a given temperatobci0 ,w9qkfuu8n9d 9u (7gature difference across the thickness will

  A layer of insulating material with thermal conductivity K l5f)kss lxl ( ,y/r)di mo0g0x.ldmi+ is placed on a layer of another material of thermal conductivity 2K. Ts).fill +kmm )xi0 d,(/ 5lrxdys0gl ohe layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of moa 4 sio56blkn nv7 rx-r)yx0d5lecules from one place to ka55liox -rxnsr0v d4n)b y76 another is referred to as

  By what primary heat transfer mechanism is a pot of water heated o8dp*pboml h- kh -eruf 8n8/1zn a stove?

  Convection can occur bldfb3ia9 mqswdpp b x+14r)-,gk p8-

  Which of the following best explains why sweating is important to humans in ma w g4,oq;c pm+y0vph(pt)xvj5intainip4j5v g opc (tyw;+qhp,0x v)mng suitable body temperature?

  A spaceship is drifting in an environi yu:tnwv5kg .mt/10 hment where the acceleration of gravity is essentially zero. As the air on one side of /g0 mk 1w yu:n.tviht5the 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 mb ,s5fqv33jh-p-gu(sx3xfr4-p) e s+ edg zph aterials. 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 larger hd+rs,xqefv h-xj esb)-5z g pufph3g3-4p (3souse would need heat supplied at

  If the absolute temperature3tg5:9lx ilqc of a radiator is doubled, by what factor does the radiat3x:tg liq9l 5cing power change?

  The process whereby heat flows in the absence of any medium is referred te3v3 mz2,m6j.( uokhhh5m3bk2z v n zpo as

  By what primary heat w dhosd-xfq: 3xizj8)er4 3g,transfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent todubnii :3jdf,bd*j ; t27aw+,ovxh5 d how much heat?

  16.5 kcal of heat is equivalent to 4 uxsr ok36+xdhow 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 o9w8 kqlq19c8w(:k cvss0ukdmxf3.r temperature of 100 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added2b i9.j5ps el ah-e0:y eqn2ub to 2.0 kg of water, what is the resulting temperature c2u bb i9l p:e0a .seyn52e-hqjhange?

  A 4.0-kg aluminum bloc nujca.4k/2pmk is 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 mai3odph l5* ac7wzf;-b terial by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat uptw 6e9bj9 *q (fa7mfm yl5hk,m her 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 mucft+aw-5xolc+tp 4:2yekct g 6h heat is +gf e-ot2c a w:y4tlc pkxt5+6added 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 metal imv70sb w9 pd(ns 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 copper1z9sgjkc; e3 i, 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 j bbb mnx(6dy5wl-6o-xzdpr7s8 kjc2a,5 u;h at $100 \; ^{\circ}C$ 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 thaz,dt 8tqtxq6 *21 qfodt is thermally isolated from its surro18d* qdtxqt t6oqz,2fundings. 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 between varfhi fs+/ x(z5p+05a2rvcs2b pa,g rau7qa :r vious forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. 52h 2c,r / vr+v5qagi7fa:f0asb prpx ( sau+z What maximum temperature rise would one expect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops 7(4ypxa dlms 0d bg.safyc5:z5bc63z a distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what tempef ydzcasz4b7m6 a5d.0pgb s yl5(xc:3rature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how;pr* u*zl rl- xwl;y/p long would it take to heat water in th-u**p l;lpr ylz/w;r xis 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 of 0p2u.a(3sd j qcaz0po water froj0uod 2pqacp03zs a(.m $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (massf7mp3 slsue l,2;/sh e 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 (specifi toh8 .o)1ppwnc 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 to liqu27dnd n4iug scxwj-t k4m*v-/id?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is 3 ,2ng6kihvb sn,h3sp required to melt 200 g of ic nsbhg 3h6n,ski,pv32e?

  How much heat energy is needed to changzr1j rb0b) nz/9n6 ivrre 5+pre 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 1k npxvf wbi:xhiq2d22 s 5f9ru0.17ke00 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 ok1;dk; k bhbp/f 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 a vh.5pxzt5eq ;t $100 \; ^{\circ}C$ 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 w(ns)p+)s)f ; kwzyzk$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of waterjri; wi(f w+: 3ptjbj)e: 7lqh at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change 1 w bs0yogg r3iv,*wdcql8;,js3y/r aone gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is requixnt gf2) 5a*tgred to change 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, .i.d y3o gmv8*iz szn04btezhb/g*d5 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 req5i +0qb)jp o j.1mtheat of vaporization is 207 kcal/kg, and its melting po.r+jq 5 m)1jeb0tqipoint 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 ofe3:.l mp9wuep concrete 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 aluminua5cz;e90 ke 9 m-wu0vjikm8ng m is twice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii. The free endv9k5n -zum0j9am0 gewce8 i;k 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. If the jc dm3(sk-l)kd)qg50lzbu(y og 8h1h outside temperature is q)3801zl(o5hdj )uggshymd(kl cb -k $-10 \; ^{\circ}C$ 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:-9maa8o)c or wntz( j outside temper9 wnamjoat(- z c)ro8: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 2.0 mroc o85qteh9 jn0q73x x 2.0 m section of concrete 0h r conxqo q75te839j($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1r6 its(dh5e 3f,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 temntz0ac 4ztsr,0 :z tlydi1:b1 perature 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 steelz:axsvpkt l4 *puc xj192*8sg , the temperature is monitored by measuring the ra1s pv :pz4 2gaxt*8usl9c*jxkdiant 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 body radiating energo(xlk; ): r opr;*dwgmy 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 collec vxq6*+ o2lg-sikfmg ,x6qft9 tion 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.