Which of the followi86j9vxv5p b,/d- sxt wtgab d8ng is the smallest unit of heat energy?

  The amount of heat nec(h/1m1ygpr x ()uzm hxessary to raise the temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individualpr :qgaq0 wz.ko7,6bt molecules is referred to a, o q7ar wbkq.6g:t0pzs

  A cup of water is scooped up from a swimming pool of water/pb o u5aac1k-1.bwvvzdsnkj+x + v6 ,. Compare the temperature T and the internal energy U of the water, in both the cup and the swimma/kb +5xvuw k.1 +c,v-ovp bna1z6sdjing pool.

  The internal energy ofo-o7v u;n ptr1;nnt.vwxi1 7 m an ideal gas depends on

  An ideal gas at STP is first compressed until its volume is half th i.4 s*o3,:sxijv qtade initial volume, and then it is allowed to expand until its pressure is a*,:3.tsjs di oixvq4 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 be

  An ideal gas with internal energy .lakhrwo.bc)vn*9jp4 9 n7 xgU at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperaturesxmk+6v5iphh( u0 k()y ,x3bee7ighfs do not vary drastically is that

  It is a well-known fact that water has a :y yhzkj)qx -y5 a8to44ry b*lhigher specific 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 statemen85:q rzh yy*44yab) k lojyt-xt is true?

  A thermally isolated system iu9msh,w 5 ;inps 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 c hs,9inum p;5wapacity 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 solid to the liquid l0ehotz y;k z;hu*u(:v pe+w;state is referred to a p(0we klvue u:;+hhztoz*y; ;s the

  The heat required to change a substance4fitt;* xk x5f from the liquid to the vapor state is referred to as k ff*x5t4i;xt the

  If heat is added to a pure substdc8/:imd1( wpvng:sh ance at a steady rate,

  When a solid melts

  When a liquid freezes. )o3wc fi44ko t)j,fbui+lms

  When a liquid evaporasv+koo3s l hq;h(f rj-(jxz2:tes

  When a vapor condenszg 1m262loppt es

  In a cloud formation, water vapor condenses into water droolh cvbm6pz .+v33o.fplets which get bigger and bigger until it r6.cv+ z.fvhlp3 3mbooains. This will cause the temperature of the air in the clouds to

  Turning up the flame under a pan l-amx :1. lj.tvhdja4of boiling water causes

  Equal masses of wateruodh/7shq qd s 8,47nu 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 means ojwtltzn)w35w- hd4y812i 7n qthth-p f molecular collisions is referred to ast)hpwt4q-h2n 1wij ndlt83hzt5 -7wy

  By what primary heat ty x9nrix y * j2j(q::pcmf*,luq0n jl/x,.vqh ransfer mechanism does one end of an iron bar become hot when the other enr 2fxxhvnmylql, *nyjqq/u :jix (c*,.9p0: jd is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch than(e i:j h )jrqaxde:.5u a piece of wood. This is due to the difference in which one of the following physicajqai5er. d:e:xjuh)( l property?

  If you double the thickness of a wall built from a homogeneousf.yu6( l -vr o hxpjw6tg4u7p, material, the rate of heat loss for a given temperature diffet-pxw7 h( 6 6ov4yu,.fuplr gjrence across the thickness will

  A layer of insulating material with thermal conductivity K is:ox : nh qg740h;i mzqlbcn1j0 placed on a layer of another material of thermal conductivity 2K. The layers have equal thiz7q:qh 0bhox0jg4 1: ;clni nmckness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass mh1 h+g,t9dpko9pg 3l movement of molecules from one place to13 mg htd+9gkpp9l,h o another is referred to as

  By what primary heat transfer mechanism is a pot of water heated on a steos x8hh+1pwbc8 6/n w 8h t)wsvrs;3fove?

  Convection can occur vj)dyq ;7u j/lvlote ct-,,a,

  Which of the following best explains why sweating is impor+0a:dmly oi6f +-s,hbew,me dtant to humans in maintaining suitable body temperature ,efi dw,: 6mhel++bso-mady0?

  A spaceship is drifting in an environment where the acceleration of gravl;)bh f moop .tm*a5:gity is essentially zero. As the air on one side of the cabin is heat.;m:b ap tfgh)5olmo*ed by an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materials. O(e8bksp ,t*nts,2ko zrt h l7*ne of the houses httkz* 7*ht 8slen, 2, pkbsro(as 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 tempcr9c 7s e3cd.bg;cjc* erature of a radiator is doubled, by what factor does the radiating power cha9 ;*73 bgrec.d csjcccnge?

  The process whereby heat flows in the absence of any medium is referrea3pagtu+iw*f(0zg - td to as

  By what primary heat transfer mechanism dil5t3cyhsi : 4oes the Sun warm the Earth?

  1700 J of work is equivalent to how muchr 5 clczj,b0crj+qc .3 heat?

  16.5 kcal of heat is equivalent to ho9 hxat. yr.;+.dfqob9du0jm ,h7mggvw 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 lb v,rg9 +xqc+fead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, 4u:eo:w 6sq wcvc4v5 dk5mjs4ey3xj 1 what is the resulting temperaturecw5e4s :o63wq:m uke1x vcj5s4v dy4j change?

  A 4.0-kg aluminum block is origin+rnw: n hh/i;bally 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 tempuom+fz.d gbcu8+.k :u erature 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 b+8l2s::unkudcqdi 2 js)qn(n y 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 ofk0 qf2ic.w 2lv iron and 0.16 kg of copper. How much heat is wv2lfck q2i.0 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 heated mcb)*y*k7 /7s* j;ufn(zp+su vilmxkto $100 \; ^{\circ}C$ 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 lnj;i9*gw y: gzbmk-/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 at 5q u;0)hjx /gs (enpwq$100 \; ^{\circ}C$ 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 from itp c2 t2nrtrp)1s surroun1 2rprp)tc2tndings. 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 then )zn o)i8aud/ t;c5ypbgix18 relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What m ;g8ud i tz)ix/1pbyo 8nac5n)aximum 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 5b4xwa 6wiy u5:+bh*wvwp 7or q;u1/nb0 m. Assuming that all the gravitational energy is converted to therrv5u+ w:ohnb/x4pa www7*; ibuy61 qbmal energy, by what temperature does the water rise?

  A 200-L electric water heater 8+;8xffegkaa vv*6r iuses 2 kW. Assuming no heat loss, how long would *v +fi;xe8 6 gavkfa8rit take to heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it)/k;1hau 9lf e y29sa4fh, bt nc.wspn take to heat 20 kg of water frpn1wfh .t2e) n ;sk b/4 uha,99asflycom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (maskkg f3hd )eu 7:c,kz7ts 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 blad r+pc)3fvmz onz6h+3o9 ngl7ee (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 fro dw.h3nmwawm2 a0u ro.by(6yjcy745 fm steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much h j hj:76q,cibleat is required to melt 200 g l,j7i:bj hqc 6of ice?

  How much heat energy is needed to change 10 kg of.1mr kcaeugni4s3)og+0 :p r r ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs )vv weq 2y1 ly o1+g qaf,i:bqby05+tu;qu5 tmto be removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of .oi7v2 yx2qxzhp)*za ice is 80 kcal/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 initiazax 8pq3es.+b, qx. gs*flv,illy 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 fn*2: bffhl4*x9y+ ux9:g 7hcd dwe iz$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy isb+ +sap ) g57jo5t pigl4uxe)z needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change.pzg-j )i-lnj one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to chan 2 ld.kme/xn+wge 100 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 7t 4i yp;aneu-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 kcawkgn -e zoqg: se/z1(8l/kg, and the heat of vaporization is 207 kcal/kg, and its melting poing-z wnegk/o e 18qsz(:t 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 ofb50 ql0o,s up/jr4oze 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 twic,f -lh cy7l07cs5mm4i 7pyuife that of 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 brass 7l0y,mu7mf y7 c5 4i -sclihpfrod 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 s c49u,gb un3n65h0 iluqjvd(3.0 m by 1.5 m. If the outside temperatu j03gnh9scl(v, 5b6dqiunuu4re 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 1.5 m. If the outside txtv8+,0 +xs a tdxs:9fhoa e.f adj9u-empv+e.f8jso f xt- a9,0a+xxd 9thu:dsa erature 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 flowzm2z5b; ywg+cv*, uz7i/mey+ ;yf cdq in 1.0 hour through a 2.0 m x 2.0 m section of concrete (+7,w;i 2g /dc*e5;mz fzbczmy yu yvq+$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it tak0i/ u mp-neoessz+1*-, rtih ze to transfer 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 los8qe/d6o o j3zr5n u0b kyov1c7t 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 refiningo gc zwxxilgl, s 9kbq( 3 9v4*6ni:qizv;f3p6 steel, the temperature is monitored by measuring the radiant power emitted through a, 9z gwl(v3xl 66b9fiq i*nzckiq :o;gp3vxs4 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 whew*0jgqds 3v.t n 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 av9 *r.u(dnvacollection 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.