Which of the following is the smallest un1+1)gbdt*5s akk gdqj7tae;m it of heat energy?

  The amount of heat necessary to raise the temperature*ho)prrt 6 /yu of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules is referrwuy,vu2f q *u0ed to as, uuq0 *wufyv2

  A cup of water is scooped up from a swimming pooll 2 xudina13duh90)l a+jt)yl of water. Compare the temperature T and the internal enedh1tudlau )xn3jl a9yi)l2+ 0 rgy U of the water, in both the cup and the swimming pool.

  The internal energy of a8o(6h4yr4u a k;vx1etcxjjq 6n ideal gas depends on

  An ideal gas at STP is first compressedx2.btj7j+su zm 4 ,ubh 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 temperature constant. If the initial internal energy of the gas jmts,xbbj 4u. +7zuh2is U, the final internal energy of the gas will be

  An ideal gas with inte)isq 6 83znqe4mu5rbernal energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperaturf38pimuk8t zct-:,y ces do not vary drastically is that

  It is a well-known fact that water has a higher specific heat capacity thav0a d+vkgv (t 12ng rd28yftx(n 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 sty8( 0tvfr n (v+ gaxdgkv12d2tatement is true?

  A thermally isolated syst 7eyrk 1xtg*q8rk:4fmem 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 magnitude gain or loss of heat during the time the system takes to reach tfmgkt:1rer*yk 4 xq87 hermal equilibrium?

  Phase changes occur

  The heat required to change a substance from tx/fgbb2pser v /gg57: u0-omyhe solid to the liquid state is referred to fep2gyuxvb r:-gsbo /g/57 0m as the

  The heat required to change a substance from the liquid to the : ddfj4mqruhn f u * iw4a7cs-5y+eu)*vapor state is refern4*edrayj+uu-4 f:7 c mwqf s hd)*u5ired to as the

  If heat is added to a pure substance at a steadya 2-jq:/i gsejfr82mv rate,

  When a solid melts

  When a liquid freezeshyr**vh c (.ala sl-1-s9gvue

  When a liquid evaporateslzn vf+bhl6sf 9e6c80v kl20v

  When a vapor condense yb7u01t7cv.ie*yrd 7fc +ldus

  In a cloud formation, water vapor condenses ri q8 u2,qfg6zinto water droplets which get bigger and bigger until it rains. This will cause the temperature of6u rig,28z qfq the air in the clouds to

  Turning up the flame under a pan of boiling water causes46bloglx t,;m

  Equal masses of water atc1 10z :bvq, jtjrx24v5sfaia $20 \; ^{\circ}C$ 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 b;fhke 7 rr6p5a0 yof4ty means of molecular collisions is referred to as oa 6rhe4kr7yt0; p5ff

  By what primary heat transfer mechanism does oney*3vi; qw9awz+dvo tk0 1,vek end of an iron bar become hot when the other end is placed ek;v + q0,tovdw3wy9*v k1zaiin a flame?

  On a cold day, a piece of metal feels much colder to the swm0jk8ua /u.touch than a piece of wood. This is due to the difference in which one of the following phys/a 0sj.wmku8u ical property?

  If you double the thk*5bi1efq9rpap c5rha: / p;w ickness of a wall built from a homogeneous material, the rate of heat loss for a given temperata/f: ;1 b5e9kqi phrp pra5*wcure difference across the thickness will

  A layer of insulating mater-dm ft,ilecw298(jmbxdx (: aial with thermal conductivity K is placed on a layer of another material db9a-(el: c,xw(d28t x jimfm of 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 massff zrk5y0 f)+ffkdplx*m.9*a movement of molecules from one place to another is referred to0rymlx.fk **9 fpf)ad5f kfz+ as

  By what primary heat transfer k-yw d4eow-o3mechanism is a pot of water heated on a stove?

  Convection can occurzka1pd/;7f 2lig 7ami

  Which of the following best explains why sweatine+ t 9 .oxlzuiy0ssu26g is important to humans in maintaining suitable body temperus06y9u l2+x toe.sizature?

  A spaceship is drifting in an environment where the acceleration of grav fynxt)h2fvth*h yk/9g) yl 77ity is essentially zero. As the air on one side yhy/7kvfl7n*92) h) xh ttf ygof the cabin is heated by an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built frkt33i5nx.uq1b s qe nw7t0z(dzx1j*d om 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 wouqnw03ijx1u73( e *d.5ktqtdzzx ns1 b ld 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 does the ratz+8r qga:m 8ggzu )t1diating power c:ggt zagtu8 +zrm18)qhange?

  The process whereby heat flows in the absen,6, bnx u,mljqce of any medium is referred to as

  By what primary heat transfer mechanism doest+tr1 2lv* zxy.8w yap the Sun warm the Earth?

  1700 J of work is equivp lh pw3b 5n(wo0(wc,7oety+nalent to how much heat?

  16.5 kcal of heat is equivalent to how much 378o9w)gp tg2ooz o1ft 5: jo csypbj1work?

  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 of lwj -d0xn r.jwx d1:c2tead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is addo d 8f6z02ndwted to 2.0 kg of water, what is the resulting temperature c6n 2 odzfdwt80hange?

  A 4.0-kg aluminum block is originally atqqofyenox*y 68l(8o /5ckqr . $10 \; ^{\circ}C$. 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 materia 0s 4ogygb3xu(l by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to hey cfhlq ny:suqp;:(,f4 c8y*cat up 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 olupn:kq/o;2sg fhuzl9lag950 c7v1p f copper. How much heat is added /:9nkll5goc9lq1u;vp p7f2ah 0zs guto 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 meta+p8 hz9j: m ejunsb2loc)u3z3 5om,del 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 copt qveh8 4l9(ifea1l8n fn84f3fbb) vwper, 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 at czk+xt rw7a1a8 3srel3)o ez )$100 \; ^{\circ}C$ 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 sysc.w ;rp)lx 1jxtem that is thermally isolated from its surroundings. One object has an initial temp;cxxwl)jp1r. erature 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 be5,mfm757 my4tohdhe- lm1 captween various forms of energy by measuring the rise of temperature of water whdal5o ,mh7ctyfmm514 7pe-mhich had fallen down a waterfall 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;;frr4.6cw gz okbh 7a Falls drops a distance of 50 m. Assuming that all the gravitational energy is convert4ar r b7 z;ofhw6.gck;ed to thermal energy, by what temperature does the water rise?

  A 200-L electric water heateri6u tgm62w ot7 uses 2 kW. Assuming no heat loss, how long would it take to heat water in to 76it ut2gm6whis tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. H*suv+dx c793ub920* tcyc 6uq bwk5m kje(ztwow long will it take to heat 20 kg of water from bcwquzyex*u+jk9w7k56c*9(2mb vcd u0 3tts $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (massrgs:x7x f 9s(f 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 (speccp- ;e)dx2vf1 cpa hflt:k r0(ific 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 fromp )ehk/ u98d owgh6gg5 steam to change it to liquid?

  Ice has a latent heat of fusion of 80 .bnkl/u/e 2(qvr8w ql m9wa,s kcal/kg. How much heat is required to melt 200 g q/kv. nu 9 2(e/bswlmrqa lw8,of ice?

  How much heat energy is n v-et :.k6lg0k e(donkeeded to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be rebfzipx3x .+ssdm* ddx nlr( 2m*2 d*f0moved 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 ;o(w6 :fojtnr $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water i 82o3oh t4r5fvq-lxoix5:x *-hpsfdqnitially 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 ae8lba7j)dojj+b(ov- t $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10rt,8) uihrm *x kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to chan* /l ud d3bpyertsvw/a* s3v(;ge one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100b p1k.bd:,mps 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, initially v/jj/*u 9lceympu jpmor84 93at $80 \; ^{\circ}C$. 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 va u1bwxvhm 5sbv+wyo+h ;x,7y /porization is 207 kcal/;5xvsoyy b1mh+u wwv7hxb/ +,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 conductivk;btsau).i dxcx/as8;q, gb 6 ity of 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 aluminum is twice that of brass. Two rods (onehx9 j3tld dniw0v0 -(x:szraiza8, m 2 aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii. The fredd,ivzmx0asi:nlzh9 rtx(-a32 0j w8e 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 hy)w3n46p; y5s(m5 nols whpf nas dimensions of 3.0 m by 1.5 m. If the outside temperature ishs34n l65 (py5wn;o)n pswfy m $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cm bmimoez +k0s:. rxb)*e;np0f thick has dimensions of 3.0 m by 1.5 m. If the outside temperar fi)e;m.nbmez+0obpk*:x 0s 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 flovb i r57gd4tos-3kk3x w in 1.0 hour through a 2.0 m x 2.0 m section of concrete 7gi 3skt- vdb3krox4 5($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 hea(e /* jxwsozz2t 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 throu9g oltn a9h55fgh 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 phhx)w -yn t4-refining steel, the temperature is monitored by measuring the radiant px yhtnph4- w-)ower 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 is a:uf3 c mf6bqj4n s7i/m5 macpnl,cm, 0t $33 \; ^{\circ}C$? 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 (effective8 cxafy 0lt+2 je0q0pv 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.