Which of the following is the sm2;ynpc u8r3yn *vi; 3xb,ckn 8hgc kt:allest unit of heat energy?

  The amount of heat necessary to raise the temperature or)s hx3omue2pj;z u.+e8 mg) ef 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of uqt/k;iwx k 66individual molecules is referred to as;/iqx utkw 66k

  A cup of water is scoopeddk t rv(hvh9aia )zz99h3e7 9e up from a swimming pool of water. Compare the temperature T and the i7(z9i3h da v 9atzve9hekh r9)nternal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an iddu 6.i: kmyne(eal gas depends on

  An ideal gas at STP is first compressed until its volume is half )obr5a9pvsj 8 p:qr g136depithe 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 temperature constant. If the initial internal energy of the gas is U, the final internal energy of the gas will beo18v:srbq96i pd r3e gj 5)ppa

  An ideal gas with internav i7: dbmpx,bojck 19. e5e*crl 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 is1ju),e z baoxzf2 l-;r that

  It is a well-known fact that water has a higher speci:q5o tjv7, ;xz o x-uyemb58zofic heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which stauxo8557ot;z qm-xo ej , v:bzytement is true?

  A thermally isolated system is made up o2 r1)cnhlxr0uf a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in nrlxr) 20c1uhthermal 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 equilibrium?

  Phase changes occur

  The heat required to change a substance from the sol.)ilha3bd3 m uid to the liquid state is referred to a h33.iam) dulbs the

  The heat required to change a substance from thw b 4m(c0g673cg2 w;nihiw +ycpd jc6fe liquid to the vapor state is referred to as ;dpcj 4miw6ib(wf320g7 w+ch yngc6 cthe

  If heat is added to a pum2 k;qidjah ),* x-fj1y x+nysre substance at a steady rate,

  When a solid melts

  When a liquid freezescl3c, c* mwj(y

  When a liquid evaporatequxq qbt3; 2vdw:9uh 9s

  When a vapor condens,kj,m wyia-(jmk ujp.m.1yp4 p(-nlves

  In a cloud formation, water vapor condenses into water droplets which gy6,j94veuaq:qsr7 j ity/m *z ;j+v+vpnpl2d et bigger and bigger until it raq;q, aj:nty4v6jzs7/+dmp* revl+u i9y vp2 jins. This will cause the temperature of the air in the clouds to

  Turning up the flame under ,6.afq ,u aerddbpl5: 1xgrc8lt)oo.a pan of boiling water causes

  Equal masses of wate* pxzy4;s50/c6oi;s5jwp yuwlj uea 2r 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 flows4w3bt9uqw62 x- ;wfq-hd iwgs by means of molecular collisions is referred to as3wq94hg-xwwif2w-6dtqs b ;u

  By what primary heat transfer mechanism does one end of an i/fe : sz1wyqdh;6jjh(ron bar become hot when the other end is placed in a f/:shyw( ehj6j; d1 fzqlame?

  On a cold day, a piece of metal feels much colder *p v9rw prud,(jv6pb1 to the touch than a piece of wood. This is due to the9w*b(r vpp1 r,up v6jd difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous+l,( 5x8nr yr 9hp sddt9gqulh+ko7b. material, the rate of heat los hrlu(9kh9b+tp g ,7dodsql r+8. xny5s for a given temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed on ag w 7kade.a c)8*pw+qh layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the comp)q7gpead. *hk+8cww a osite sheet?

  The process whereby heat flows by the mass movement of molecules from one plrwbn/o n /l/p9tze 5x1x8:ghc ace to another is ref/l g:n/9phxw1e5/xboc8z trnerred to as

  By what primary heat trang,b gbr:+8wi nsfer mechanism is a pot of water heated on a stove?

  Convection can occura3-az0:snw 4vwjzs/a6 v1ezsl ):65d x qi zrh

  Which of the following best expasi71ue, zru6o0 ed3jk 5jz:54nrxmhlains why sweating is important to humans in maintaining suitable5 ix6erd n u4maj:r,ju1sz0z oh35 k7e body temperature?

  A spaceship is drifting in an enddnmo t3 /y*l;nfq:/d vironment where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is /n m n*ldqy;:f/d od3ttrue about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materialsm gg zbdv3+3tm3q h(p+podrp*zm74g:. 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 house would need he7mbmp3p 3t:p+ zm(4 rg3z ogqdg*dv+ hat supplied at

  If the absolute temperature of a radiator is do4u5bqbw hd(6f ubled, by what factor does the radiating power cq b4bd(5f6uwhhange?

  The process whereby heat flows in the absence of any medium is referred0 ;lndon8apl,hv7 ccu.. hq 2k to as

  By what primary heat transfer mechanism does they; hxv: y4q zxu35e2bv Sun warm the Earth?

  1700 J of work is equivalent to how much haj3a.n 2brf/ eeat?

  16.5 kcal of heat is equm1tsa6em 4gzqe 6-v5s ivalent 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 needed to raise the temperature of 100 dn. 8 r f:142bqvnmuewg 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 wa10ejharh. ee.yjdoy3 va p ,:6 7d-qchter, what is the resulting temperature drh p3 e6 7o, jeyajv-1.c.yh:h aqed0change?

  A 4.0-kg aluminum block is original xclvx.*4tu sn xo308cly 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 materia8 e o6on0pb4gol by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by additkzmfh,q8; tff;ntoy)/ : *of1g7 gljng 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 fbkpuk -.1(s8kmcsf( kg of copper. How much heat is added to the gear if the temperature increa1 sm8pfcb.( fk- u(kskses 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 ip3qbo *izg *.qoip8v0s 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, initially o gpcz kq+ pv l. de/ls1n(0jhi/1a xc:n/-sn4at $95 \; ^{\circ}C$, 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 .f lg,sb n8un4$100 \; ^{\circ}C$ 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 frozx.7c+fqu u+doqfo/x c o9) b:m its surroundings. One object has an initial tempc+bqxo97x ooz f uf +/ud:q).cerature 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 attemptee5pxdtx0w v ina92o1.f0 7lcbd 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 ridc bp1no. fi5w07t9v 2a0lxexse 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. As6j2ns1 +)r helhjl+ nbsuming that all the gravitational energy is converted to thermal energy, by rhll2 hen)sb6jn+j +1 what temperature does the water rise?

  A 200-L electric wat k9.dxz bb1benag;:a3 er heater uses 2 kW. Assuming no heat loss, how long would it take to heat water 9 ;kd1xb a:abn3eb.zg 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 20 kfe*60+n2*7 h qw .8ykpnxqdvl tz1kbpg of water froft 7 0z.hpkq2 b 8w+yxp*6vl 1kdenq*nm $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (u vn8 p7(mw uy 2+jgm9d5hudyt6s37u9 trto+m mass 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 (spec wljm:jp/p:w2ific 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 td t(qlm 0 w,a6c0rl3abo change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How mug exhz9p s1 300qquti6ch heat is required to melt zx hs 091p i3gq6ute0q200 g of ice?

  How much heat energy is needed to change 10 kg of ice at ,ldopbr/nx4- $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100alg;39lqh m)r 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 (jv ul)7ii -jzat $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water inisfrnoi 2q .8nu;pqy0*aakn*:8* xw bltially 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 atczh3. xdxx+ ;n,bo:v ix)kgn, $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of water pt8hq ,svj9 :kpvirb2 80 zu2tat $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is requis-lk*r m s4 cu3.mgw(tred to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g oi*+ylb8 *fd c6lwx gs:o mkn57f $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg ofir z tzm6t+.,j 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, anz72wphn e4sfh k7d*r81q5ovxgjac ;*d the heat of vaporization is 207 kcaq rpwaxog7 h4 csezh7 ;1nj5*kf*v8d2l/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 w6ahr5gx+6u8 2zq amjconcrete 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 dwwnyy8: :g6ul2 ,uty of brass. Two rods (one aluminum and the other brass) are joined toggw y:yu6ndywu2l:t 8,ether 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 5hxk. l 5bfu.uthick has dimensions of 3.0 m by 1.5 m. If the outside t l5xuufb.hk5.emperature 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 by 7v 6: 0u yxedj)7e 1bnatk5pbq1.5 m. If the outside temperature y756eap jbn0 u:k)7 1b dtevqxis $-10 \; ^{\circ}C$ 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 fljujo*78i(lx9k8 aq1 bwlua z:ow in 1.0 hour through a 2.0 m x 2.0 m section of concrete (1uu j8k xl*la(jw 7 9ab:io8qz$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 heat f8 fmmz(dxjncu5uxonfk4)2+ 0j uv+ 8through 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 temperatureaty*o p z6 l0n6ry:j7vm7m.qn 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 revi6hj rax,f 0vlb6j)ui)c4.wfining steel, the temperature is monitored by measuring the radiant power emitted through a s wi)0rjj6,6fvc a.h4x uib) vlmall 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 boh u)d6zd 7/z 1cr uqk-/-lwwfjlo1s6tdy 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 insidl 040dkqqe5k e6 hcnk gm0si)i5-/scqe a 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.