Which of the following is u6zfc ewsd3:*the smallest unit of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of water by 2vdy**oiqojl08l 1mq 5 k/h kl$1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules is sr5 f-inu8 )t0f.k x)9mtd2skwxbhx - referred to asrh x-dmx)w59tfb8s uti2.s -) fxkk0n

  A cup of water is scooped up from a swimming ej/ a .tkqngk2/xlz.ho +,v,cpool of water. Compare the temperature T and the internal energy U of the water, in bot+. ztxjkq,cgl,/nv ke/.oh2ah the cup and the swimming pool.

  The internal energy of an ideal gas depen(t,roui c/r3vaq7k s2 ds on

  An ideal gas at STP is first compressed unticb7a (jij+dw m6yvx)1rcd 1p 0l 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 temperature constant. If the initial internal energy of the gas is U, the final internal energy of the ijdc d)pjmb+ cyax6 0 11wr(7vgas will be

  An ideal gas with internal ener;f9y lc/2dl2l e:lm jggy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do3p qmbe1y p7ke6g+ j1+l 4hcnn not vary drastically is that

  It is a well-known fact that water has a higher specific heat capactetm+w /svb; 7ity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is ad;t /+btew 7vsmded to each. Which statement is true?

  A thermally isolated systk 0lvjv/9 +qc.a8d6 soyg ;pnuem is made up of a 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 s ql/c+yujvv .6; nk0opa8d g9magnitude 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 s. )cmwdsj e n/)gyo3x8olid to the liquid state is referrecdn )yg oe3.)sjm xw/8d to as the

  The heat required to change a substance f50y g, iads2k jj f/whh/wwq b+0ix23xrom the liquid to the vapor state is referreiwas30b2+ghk dw/yi fjjxxh q5w 02, /d to as the

  If heat is added to a pure substance at a ste.ff:ngrwsa8 h 2)p4tnady rate,

  When a solid melts

  When a liquid freeze*bw5 9+,, dbfur ezf *nz6.y h7saoxbos

  When a liquid evaporateijf2t9whanh.;f 1 / ma38anq rs

  When a vapor condens3;5 plx.wl 89yv 8rfqmzve;m xes

  In a cloud formation, water vapor condenses into water8l3yl z5n vm hezgqeohp.;w vx09x :5: droplets which get bigger and bigger until it rains. This will cause the temperature of gzw5hz9:ymh5 n 0:p.;e3x8q ovx lv lethe air in the clouds to

  Turning up the flame under a pan of boiling water :u7*l brqa7pk causes

  Equal masses of water aahy)c onlsbdj;ey6 pxxd7 3 ,n e680t3t $20 \; ^{\circ}C$ 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 referre pog9k1 i34yyrd to aso3y 194y ripgk

  By what primary heat transfer mechanism does one end of an iron+lu5g bvpp1s; k,c m*n bar become hot when the other end is placed in a flame;k 5+v b m1unpgs*pl,c?

  On a cold day, a piece of metal fy7)c4 a: w/n98xye ywmam4our eels much colder to the touch than a piece of wood. This is due to the dic487rmxwoyy yn/: )4 9mwuaeafference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous material, the r2+61hivrm( zs kwm s.wate of heat loss for a given tempeksh2+wm.wmv r16i sz(rature difference across the thickness will

  A layer of insulating material with therm0*l)n)pgv9 yb c,ulf ex+jvz +al conductivity K is placed on a layer of another material of +py+l bxuf0 je, vcgvzln*9))thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecules from mq+v+f :k22sdm7n4n feaqm4 oone place to:4od4m na 2e+vqmfns +mf7 2qk another is referred to as

  By what primary heat transfer mechanism is a pot7 5mow-j fbg5jmue1;.ci tuzvp no4 6; of water heated on a stove?

  Convection can occurrabpg 9o zh*c7j q2(2d

  Which of the following best explains why sweating is importanyxs x2rv lm2+(t to humans in maintaining suitable body tempera l2sm+rxv (yx2ture?

  A spaceship is drifting in h8qf )-l1v),;v5dekxvf e.l mco.qpd an environment where the acceleration of gravity is essentially zero. As the air on one side of the c1)d -v hekq ,8e q.xvd)o.fpcl5 ;mlvfabin is heated by an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighborizf 4/vy:gwc vr8(ve0d ng rectangular houses built from the same materials. 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 sma :fgvw8 yv0(/rdvce4 zll house, the larger house would need heat supplied at

  If the absolute temperature of a radiator is doubledz( pyabk2fx2k*bbl6vt7h4( ii g7e2 d, by what factor does the radiab*(d2vt22i fg4z7l ek7b ybiapxk6(hting power change?

  The process whereby heat flows in the abse3d p ygzf6 yzi.6v8k-ence of any medium is referred to as

  By what primary heat transfer mechanism does the Sun warm :8ox w10t0rmx1hj ylcthe Earth?

  1700 J of work is equivale3 z y deay)m1cw0g6o/oh1,mrxb *b3ijnt to how much heat?

  16.5 kcal of heat is 2/ 6m8 ;vlhwv eo u1tx zn20rw7:rmmhsequivalent 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 temxrf gpq8b8cxyl -i:d.6g nl ;*perature of 100 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is adde u7vp +m)5eju4akkh cep6j7j .d to 2.0 kg of water, what is the resulting temperaturjup 7j h5 6e kcvkem7).j+u4pae change?

  A 4.0-kg aluminum blg,7o n:kwa d332mouabock 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 kw 4/w6wc2b7sxd8hq3s6lijf (uq sp*material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by adding 5.030d eoi 9:fmwdzsj4 0i 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 heajxyp6at+q o,5t i,q at6o5 +ypjxs added 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 is hef9s pq.rhneu9 ) r63arlg4er8ated 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 coppoa .;b:i l0wn09 kl:ob+o,czpaky6q fer, 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 atyd*n,0)oos8 tge qt. jh z;qip +-l6uq $100 \; ^{\circ}C$ 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 thatjnd +qt3+ld xo*:aga 9 is thermally isolated from its surroundings. One object has an iniodtg+lj + 3:n9*dqaaxtial 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 attemp6. wjvsl,* iacted 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 with a vertical drop l v.j6ia*w, csof 20 m?

  The water flowing over Niagara Falls drops a distance of 50 mm3vnvmzt o)+5xs*p0o25zsp w . Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rise0n3*zv wos5 z+5m xt)2svopp m?

  A 200-L electric water heater uses 2 kW. Assuming n ,3ui9roi5 oic2p6 twc5jreu4o heat loss, how long would it take to heat water in this ti5ojiu3w 9,54c t6our2 rceip ank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heat 2(os1 i7nely t8 x9r-n02 tist4z1rpjo0 kg of water from8txrs2zjl sp-49i1( onye onri01 7tt $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 10008x9s0 : 6arkg tezcf:o 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 ( us xgkw99zz3rph-kfa8l2f3 . 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 ;7razdd7oj xa3g+ v *qfrom steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heate n(x;5e j5u+pv*hyig is required to melt 200e;y u(ph*+inx 5egjv5 g of ice?

  How much heat energy is needed to change 10 kg of ice atbg8l m5 hqvrkz3*zi 63 $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from w8m 5vwt *: 4z2 kqr/rihmq*b l(o2bgo100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kca 7jo7wq+h4kd lmp-1sn 7cjl2vz9 wskqkfg(8 4 l/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 initially qh d1f)z3/eh)ym bg x** 6vjf )n2nomrat $100 \; ^{\circ}C$ 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 atafc8 j5ha 1xw ps(**wb $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energyl2andh/ds 2 :ppt.pnx*5)ce5 e;dr ts is needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to cha,m1eqj (id* *g. m.y7oteqnt ange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to changeo x m-as+gys1pt*51wx 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to km c a610rz-bxq;oo 4x1.8 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 vapori1 w*be gzpo-r3zation is 207 kcal/kg, and its meltinrgw -* op1eb3zg 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 concrk, 8i l:+o 72c. jaqbmdsrl;jzete 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. Twr poi*dwslc+0*1kh x +o rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths 0r io*+slp1d*wk hcx +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 ha+ tcxbo 9 l;y qeyl6dqb5907ivv+x(p ns dimensions of 3.0 m by 1.5 m. If the outside temperature iidlvnc9(l5+ 9;0e7oy+y bvpxtbxq 6q s $-10 \; ^{\circ}C$ 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 dimensions2 6bt.+m1sjs4qhv x us of 3.0 m by 1.5 m. If the outside temperassvtxsm+uj1 b q 62h4.ture 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 m x 2.0 m section of consn(1 d8obx8 sjbl5.izcrete ixj 1bsd8.sbo z8(l5n($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 8ev+fzew g 1-uf:vj0a,u7v fq 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 400yab lh,. (,7u),o2/lxzfkcw cc gfaa:0 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 refigufp.7pr 6.aj ning steel, the temperature is monitored by measuring the.ua6j7p p.rfg 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 body radiating energy when it isyp ,e8)ysagd q9ws h19b a6hg0 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 solaarh/s .brkdld)x00n 1rit p/(sm/ x.ar 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.