Which of the following is the smal1 ,yyc,p(dq7 5gwb zv:)o ihallest unit of heat energy?

  The amount of heat nea6s7xe s)r 4ivcessary to raise the temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the averagemi /age-flu)pqn t1 1* kinetic energy of individual molecules is referred to /aq11n*-il mtf)p u egas

  A cup of water is scooped up from a swimming pool of water. Compare the teer pt- ssf;s.,mperature T and the internal energy U of the water, in both the cup and the swp.;e,s rsst f-imming pool.

  The internal energy of an i h0yc. qga47le ak7mj4deal gas depends on

  An ideal gas at STP is first compressed until its volume 43a8q4mtfqlc2en rc7is 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 temperafcn48q qtmc3a72l e4rture constant. If the initial internal energy of the gas is U, the final internal energy of the gas will be

  An ideal gas with internzqjk /xt8u0s a.di()et,y eh 9al 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 drasti tx.oni*/, 1hatb5 fddcally is that

  It is a well-known fact that water has a higher specific heat capacity*6 pf)rse(ajr /sqkfl /+m58 req(gbe than iron. Now, consider equal masses of water /rrmrjbs p*l6e(5 / 8qefg(e +kaqf) sand 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 hot pi iz5p :i)d8ol sh5ya9hece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capa zlih95: o ys)ipdh58acity 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 substandv:;znv- 6ehd oqd zd .uhf2+4k4y -stce from the solid to the liquid state is referred t sv4vz6kd;d+uon.d:-2dqzteh -4 hfy o as the

  The heat required to change a substance from the liquid j *+unwt4xu6nto the vapor state is referred to axwu+n ujn6t 4*s the

  If heat is added to a pure substance at a steady b 40o 8(i2grwan evm3rrate,

  When a solid melts

  When a liquid freezessw,q,r:-v/+p g kfnsj

  When a liquid evaporatey53x)ra9d* : tws dijjs

  When a vapor condensesqb:78 8kqn zpe*e;ml7t s+w veuzl77o

  In a cloud formation, water vapor condenses into water droa k)p9a ip j6m*z)w4o *ivdkj8plets which get bigger and bigger until it rains. This will cause the temperature of the air in the cpk)ij a*da 94jwv)p6mk*o i8zlouds to

  Turning up the flame under )my8yfrndx: ,a pan of boiling water causes

  Equal masses of water at 6y0eosxvi..x h(qwj8f hb 4krp504r d$20 \; ^{\circ}C$ 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 refer2gjq /g; +krtfjo tt:frm y* 8dh7gt2)red to as/f*+ot;2 try: q)m gjthj kgrtd27g8f

  By what primary heat transfer mechanism does one end of an irh9xlhh -2 p6ydtm56 pbsuc:( kon bar become hot when the ot x2sc k5h-m9lh6py(6dp thu:bher end is placed in a flame?

  On a cold day, a piece of metal feels much colder to theiya 4 sc8v1oam3q. p+e touch than a piece of wood. This is due to the difference in which oo4ep8+s .3i qy amvc1ane of the following physical property?

  If you double the thickness of a wall built from a homogeneous matdr 9ibx/ ,dr+qerial, the rate of heat loss for a giveqd/9,+x dr ribn temperature difference across the thickness will

  A layer of insulating,llhg pt h8,ewv1e-w83z gv0f material with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thic 83,g fgl8vh1hl,w-v0p zeewt kness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of moleekbj+/,lcc u1q l9r -zcules from one place to anothe9 ru/l cbelk 1q,+zcj-r is referred to as

  By what primary heat transfer mechanism is ah/eqtah kg p- xg-xwuat(-* 33 pot of water heated on a stove?

  Convection can occurzneay6 j +ak3,

  Which of the following best explains why sweating is important t n1uicfxw;;i4 o humans in maintaining ;1cx i;nu w4ifsuitable body temperature?

  A spaceship is drifting in an environment wher e+x:n ouvk5 w7n q1o/+jleb09vvo9dse the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true aboew7v s9x0+v /1:e59d n+oujlq bon vkout the convection currents caused by this heating?

  Consider two neighboring rectangu n:o+up5fs k8utcc8 -alar houses built from the same materials. One of the houses has twice the length, width, and height of the other. Under identical climatic conditions a8s8-uk uc:f+t 5ponc, 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 wa9s ev0 /, mspc3l7s0mi g-rwrhat factor does the radiating power changcmam0re i3/ lgp ,srss97-vw0e?

  The process whereby heabli(qsde.-cd2jx w :- yp1.re7cve 0 ro )gnk2t flows in the absence of any medium is referred to as

  By what primary heat transfer6+-pedh*+tepdlol 0u.bi hv c k tm-18 mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how much he1y0a5zy5 e r:vsj2 zcnat?

  16.5 kcal of heat is equivalesa.i a5:m 8,ol; ezaqmnt 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 g of lead qt,x-8ai zv bazvf f2 x+s-2b.($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, what is the resultin5xw5(ysn ta3pg temperaturxpw(ys n 3a5t5e change?

  A 4.0-kg aluminum block is or xy/sntnn)xqn*4. g-y iginally 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 temperakt*() 8fnvtwci zazuna3 o8n: l:sa8/ture of 2.0 kg of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water bhz7na1;i8k n iy 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 he - t bp:g8*ngtww jr/bur(47ekat is added to the gear if the temperature ben4bjpgrr(w:u7*g 8w - k /ttincreases 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 heateeei 06z6cqh9y8+/pge u+ xnn vd 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, initial(mfc:kzns p7m +qnn+so-.lv:ly 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 arxs* s40megm2t $100 \; ^{\circ}C$ 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 systeyzowrwyspu(5, hp 7nu jx0( :6m that is thermally isolated from its surroundings. One object hasu7u:6 0w(zjy w5(ny porh sxp, 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 relationshipsmg:/ qhv+h8r r 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 watq 8v/: mhrr+gherfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a distanctlxg) q,3 yj/)obzgzx.2zk5 ke of 50 m. Assuming that all the gravitational energy is converted to thermal enezjk 3g)gz,.o5y)xb zxt/q2 k lrgy, by what temperature does the water rise?

  A 200-L electric water heater us *q uy/hh-pi k 67gf2z+a9yrm3nwey+tes 2 kW. Assuming no heat loss, how long would it take to heat water in this tank from zp+3h9 ty*m /+gu ayknifhw2e6y 7rq-$23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it tak(n,eufxu4x r.w,in6 4oaj log*3s*gbwww, g,e to heat 20 kg of wat ( gx64*flw,xbj* ,eg.gnwusw3woi , ,oa4 unrer from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000 gs0y wsx ,6a+ib, $c = 0.22 \; kcal/kg \cdot ^{\circ}C$) 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 blade6-( hzsu7: :zr hkc/psvdx+w xz 7x4fh (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 from steam to change it to liq qv:pq22.1 oipwyc +xnuid?

  Ice has a latent heat of fusion of 80 kcal/kg. How mm wm (k1pbfx 4 j4a:,0lezgh*duch heat is required to melt 200 g kd 0p(*hbmzalx, 4:j4gemfw1of ice?

  How much heat energy is needed to change 10jcq:ok8c-ho t i;;:d 6kpa. ph kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remov7ipbdl .h:7.sdecovvp *r6 /oed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. Whebfcyhn*hq 5-a q+vp0 (n 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 inigi,) k20,u ;5rgis jlj 0xjovjtially 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 a6 pskohkpb7 y/ xv(eyjo1:-5 dt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of w+ om ghfu .y3+sr3 b/+hmvx3y2 cp5uydater at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is requirqh 88p;s(cm ubed to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 1d rk-y i(hz*7m00 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1. grd t6l*ltn528 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 / zlth y2l/ 9h5hev5tea pf*44hp l a,1qibwr/kcal/kg, and the heat of vaporization is 207 kcal/kg, a,wyle1 h/blp q/5p9v rzhft 2/a5eh*it4h4l 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 h-ls;jm4qci1v3ssh;6t k1 g rconcrete 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 aluminyj;a nnxwu l(dq*.4;vum is twice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contac*n; uq.ljvd4wxan; ( yt. 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 thifol 9e+7/j- c/mhwjb yck has dimensions of 3.0 m by 1.5 m. If the outside temperature isyl j ow9jc/e+7m-/b fh $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cml5t(z 1q srk(b thick has dimensions of 3.0 m by 1.5 m. If the outside temperature isk(tr(sl5 qzb 1 $-10 \; ^{\circ}C$ 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 throuqcs7q d8j 5om3gh a 2.0 m x 2.0 m section of concrete qd5jcs8oqm37 ($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 transf c9,gkgl 5j-2btb8dpeer 1,000,000 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 temperature if 4000 kcal of heat is losizxee0 2ids z t-6+1wub;srh+t 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 steel, th)a 6jdz)(p ixae temperature is monitored by mezaj(p d)a6)ix asuring the 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 jvyd/ ,pjfvfa 2s;k7:n/ t8y nradiating 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 solar collector (effective co2m q;m29ltq/ tpgsmb7llection 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.