Which of the following is the smallest unit v1,m kt2 fv;4rngkun:of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram ofx.ziqix;10 g /4 mzkrs water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the agq3y-ugjaz/(vk4f70/ bxb ob verage kinetic energy of individual molecules is referred to z04/ fgg(yb avobkxuq 7- 3bj/as

  A cup of water is scoorw7det/8x 9 yfi p:xp3ped up from a swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and the swwx /f:xir83p7dpe y9timming pool.

  The internal energy of an ideanqlm3 +bv1br g77gjw c tqc9i1cp54 p2l gas depends on

  An ideal gas at STP is first compressed until its volume is mw ,fn cvo7ssr 2nj3lyx71x06 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 fin2 7fcs m vnjnoy1x7x,3swr6 0lal internal energy of the gas will be

  An ideal gas with internal /x0uldxf49g 6pvxxhwf o-3. r energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do n 66lxh tzw2w..wi *un1c rt.noot vary drastically is that

  It is a well-known fact that water has a hig buy08d3ph-s cher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal eq 0ds8hpbc3u- yuilibrium. 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 piece xqw,e+(ds2xzof 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 taz,sx+d x2(weqkes to reach thermal equilibrium?

  Phase changes occur

  The heat required to change a substance fy+66v /kcyoso rom the solid to the liquid state is refe+c6y /ko6y vsorred to as the

  The heat required to change a substance from thefu)ck(nemm)/ap hy9,a,db f 4 liquid to the vapor state is re),y,na4b u/hpmf cd(9)m keafferred to as the

  If heat is added to a pure substance at a steady rod888+n m xmk2kbvkv 0ate,

  When a solid melts

  When a liquid freeze7 tlba8cyk9gs0*yfo *s

  When a liquid evaporate/:ho hqv3p,jj 1x sg.q6o(bnis

  When a vapor condensesc* w kocbt*e1)6if:8kmt s;uh

  In a cloud formation, water vapor condenses into znhswosx;uvnb, r9* f2 kvh:wtt/99;water droplets which get bigger and bigger until it rains. Thisvr : v tnfuo;2t* ;z 9h9xwh9swbsn,k/ will cause the temperature of the air in the clouds to

  Turning up the flame under a w ugws+/1 0yfois(/l 4q+cswwdyhu3.pan of boiling water causes

  Equal masses of water2ofl0 (abe:h /:p rpw2xt *mdh 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 flows by mig2.q2x;pk u,.;;lwdfksg zd eans of molecular collisions is referred to asglqs kdid x;.f,u pg;k;2wz2.

  By what primary heat transfer mechanism deqb o ib++ss m3m3.-yzoes one end of an iron bar become hot when the other eiosbqm -b3+3ys.m +ze nd is placed in a flame?

  On a cold day, a piece of metal feels much colder to ttf4xsc 3dr 5gwj lbwy )5gqb4 n955i2*uqwuv .he touch than a piece of wood. This is due to the difference i2g rsqtc5vn3g w w49djb.5fw4ixy l5bqu5 )* un which one of the following physical property?

  If you double the thickness of a wall built fro5/fag:b, ca ax6ex 2eom a homogeneous material, the rate of heat loss for a given temperatuco6abgxx ea a2/,e:5f re difference across the thickness will

  A layer of insulating material wz gzo9wi:t,j )xrcb :z9t7kn- ith thermal conductivity K is placed on a layer of another material of thermal:7:b- xjc9 )tzzrw kio t9zg,n 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 movemente so:w/) (n-y pch/-sl/iknff of molecules from one place to another is referred to -snpf /iwys(-oh n:/efl )k/cas

  By what primary heat transfer mechanism is a pot of water heated on a s)yww )+r , s8novs*afjtove?

  Convection can occure: ,s ,bafs+ h:rjoa8g p8w)zc

  Which of the following best explains why swuk.t few zc)y,9cm,a j.c.8maeating is important to humans in maintaining suitable body tema.8, ka.9cez myt .fcw,u)mcj perature?

  A spaceship is driftinyu8*yu e*m;s0,n wli bs /swg(g in an environment where the acceleration of gravity is essentially zero. As the air onig ,lussw /;b8 semyn0u**w y( one side of 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 ef :gsjge3lsnvd :gg .8,.iip)w,/ac from the same materials. One of the houses /gjg d3.ifep,sicsga gw ne ::,)l8.v 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 heat supplied at

  If the absolute temperature of a radiator is -jz00m aj 9es,t;v sbm(n-wvbdoubled, by what factor does the radiating jvjs-9baw m, ez;n s vm0bt(-0power change?

  The process whereby heat flows in the absence ofi4tdz/+5*lv kqrb1eu any medium is referred to as

  By what primary heat transfer mechanism does the Sun warm the Earth0 ov 2j+ t/ /hyy3,cg--wv py+igrxume?

  1700 J of work is eqdqm (-p .c,c ff2eid.vuivalent to how much heat?

  16.5 kcal of heat is equivalent to how much work wwz6*1bya y:ogh m)k)h 3uy0jw1t)bb?

  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 tempn ,8h girny :pi.(6mkderature of 100 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2. -9dsmhzv5+ya vko l6.0 kg of water, what is the resulting temperature change vhmv- dlyk6+aos 9z.5?

  A 4.0-kg aluminum block is originally cl xh).0kknz2at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises the temperature of 2. ,8wyuc :so:c *: dqtq4rloth90 kg of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up herncb .q btkfizrqbb -j:s.*x4 3+ x2y(wc*j9cw 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 qxk)c2w5 g)zoym5qs8 0.16 kg of copper. How much heat is added to the gear if the temperature increases by k8oq2x5gs wy)mqz c)5$35 \; ^{\circ}C$?

  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/s8 ++x(gu3yzsvwlrm6f3 j3odf* n vo 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 copper,3ihu 0d6+cu0pih ( qud 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 atp2an rq,lds+, $100 \; ^{\circ}C$ 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 ffr*,w :1 m /gm3hemhnjrom its surrg,m1em: jfn w3hr*/mhoundings. 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 25 nexpgckbtsmqg m.qv5/ v:- 7r20mfvarioustkmv m.0rm:/ex 2qngp2- 55gb7vfqsc 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 of 20 m?

  The water flowing over Niagara Falls drops a distance of 50 m. Assuming thatsw1icn:v; pi1 all the gravitati : ii1n1s;cpvwonal energy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no , qgmukdrqj(h5a; v,ys:7k*n heat loss, how long would it take to heat water in this tankmkr q7:n*g,j( u5;v,sqahyd k from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is usf cc;7*ipxg(b ;wyyn6l 3 a1ewed to heat water. How long will it take to heat 20 kg of water fro pyx1b nfceicg ;7w6l*y(; aw3m $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass b3 6-(cjike/fezwo6 uu u n)tirx*3*r1000 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 (specific heao58iub0 )eh bgbap zli.3nu)1t = $0.11 \; cal/g \cdot ^{\circ}C$), 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 b2 u llyw.ekgd/m19 j;of .:wswe removed from steam to change it to liquid?

  Ice has a latent heaw*no 9i *odj+ a3wka).i4pm. a.8oi hfi(kwh st of fusion of 80 kcal/kg. How much heat is required to melt 2ah *iiof jm .k+w9w3d wa4k8(no)hsp.ii*ao.00 g of ice?

  How much heat energy is needed to 6.5kbnk5jq tfouhy +7 change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be re+p n v5 /t,mwgcdr2sn;4q6fktmoved 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 at2n7y g *jdlb pu/d:;zk $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of waterjhta 59s d;t5n initially 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 at,wwg+dxjniu* 8 tm1/qy (l,z:rh/dvz $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg ofpyiy c29-5ok6 0r bfse water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is reqg2md ibn.b 94juired to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change qhvuriv bdr5m()8t */100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1hfdlv*w;:-i1 o2 n mmz.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 5.9h +o4te 3a*k/yswh+qv kcal/kg, and the heat of vaporization is 207 kcal/kg, and its meltiny4+e+/ak*wtqhv soh3g 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 concrete is dsx*4t1h5h:z fy- llg$0.8 \; W/m \cdot ^{\circ}C$ 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 ofvsyww 40xc2; aum-k,e 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 end of the cw was-x4uy ke;v,20m 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 lv+clzh2k5wjq *844cz ag7kl3.0 m by 1.5 m. If the outside temperah+l4vc2*47 q8ak 5 jllckwgzzture 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 1 cauuc1 )/4y,.h zrfal.5 m. If the outside temperature iscuacay u z/ ,r1l.)f4h $-10 \; ^{\circ}C$ 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 colbfh ;f544u4b2dh6jgwisg 2n ncrete (fj4sb ud;5 fn 2g4 4i2hhg6lwb$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 adbem4u4mf .l *wo fhu-k7kx*e3 8*jkcal 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 ter,m9y0v0 tc3rjl *v(5p umhjpmperature 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 steel, the temperature is monij tmh2d)t7og9 tored by measuring the radiant power emitted throudjt9to )hm27g gh 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 huw0temu w4z ,xs( icv68man body 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 inside a solar colles i-,+yysq86;cu teexjj:u/o ctor (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.