Which of the following is the smallest unit of heat energy wfc2+w 1k*ezq?

  The amount of heat necessary to raise the temperature of 1 gram oo* -n +h3i ufa/:n;8rsh0fps*srlguf f water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules ibv.; w4g,gl3x o.cxlts referred to asgbo4xl g3xc,. wl.tv;

  A cup of water is scooped up from a swimming pool of water. Comparey d; xc4 ok0enj+ 3,vdrlm-em: the temperature T and the internal e e;0j,m:dy-x3oc r4nvlmd +kenergy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas dependsxw;/b ke xg4ovy1 2:af on

  An ideal gas at STP is first compressed until 2wq*wu;9smbi 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 temperatbs;*uwqmw9 i2 ure 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 lrw .v7 ge dk:u.8gd0genergy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures dv ;h d0v i2+rxabru9(ro not vary drastically is that

  It is a well-known fact that water has a higher specific heat capa 5vlweyj 02s8zcity than iron. Now, consider equal masses of water and iron that are initizjly8 e50v2ws ally 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 piece of aluminum xv l: 45*z/u qoqogfn lgv)-(scuk-p+and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more thanxfq gu*k4pgn (ucv/lq+oz 5 - v-slo:) 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 state i-/mpdm t:6ld os referr d lmtd/m6:p-oed to as the

  The heat required to change a7vsu p35*ppgz substance from the liquid to the vapor state is referred to pv 5* 3zugps7pas the

  If heat is added to a purtrud:(r3/o) po9eww-mvxn8 m e substance at a steady rate,

  When a solid melts

  When a liquid freezemjg5ia2t;:e cs

  When a liquid evaporar 7s2rff(d4l qtes

  When a vapor condens *: mqqk 7l+xhp9uspz/es

  In a cloud formation, water vapor condenses into watedgpk s-,9pw( m3.z zq r6yfi0cvv7u o.r droplets which get bigger and bigger until it rains. This will cause the temperatur6 pm oczyqi0k3v .s-9wr p (.gdf7,zvue of the air in the clouds to

  Turning up the flame under a pan of boiliqm /fefi:*3 jwng water causes

  Equal masses of water amk, jtz/qa:qgg+id + (t $20 \; ^{\circ}C$ 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 pufp,ymzw e .5a9,r tckg +3+mflows by means of molecular collisions is referred to as,urp,mc+9ky 5 fzt+m3 wpg.ae

  By what primary heat transfer mechanism does one end of an ily4e*c1q t+t bdv8m8 cron bar become hot when the other end is placed in a flamqec4t* m8byc+vd8tl 1e?

  On a cold day, a piece of metal feels much colder ug3n j+ozk/ ph s3h*e2to the touch than a piece of wood. This is due to the du3s/pz3 +g* n2hekjhoifference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous mateci2f- wrh5qi61oj cm wr.2qz2 rial, the rate of heat loss for a given temperature difference across the thickness wz i6q2i1cc-wqo r.h m2f52j rwill

  A layer of insulating material with thermal conductivity K is placed on a le3wkbp8rx,yh jul6(dx(l /, 4s hayf(ayer of another material of thermal conductivity 2K. The layer/yx y d6plw8,(haubx (e 3,rk s(4flhjs have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of mor 3tgxv6g1* 4s 1hm /ahenfd;*xu d3dnlecules from one place to another is referred/n4rte3h*ndmvgx1 6udxf3* ad;sg1h to as

  By what primary heat transfer mechanism is a pot of water k.uyz (5 cckm1heated on a stove?

  Convection can occur rya xbc6a0/s 2vjb)i4

  Which of the following best expr 2rf0gptg /h6n j4iyn--o o6glains why sweating is important to humans in maintaining suitable body tem n ghn246gjyri6gfoto -p 0r/-perature?

  A spaceship is drifting in an environment where the acceleration of gravity is ema+v*xo..ykoch *x b8 ssentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convection currents caused by thisom.kahx8*xb yvc+ .o* heating?

  Consider two neighbori1.82 zsdlkdkw d6 c2srd4oxt( ng rectangular houses built from the same materials. One of the houses has twice the length, width, and height of the other. Under s d(6dcsdxz2 dkw2or1.t8k4l 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 tempei*yijp tk(km d5h 0,a1rature of a radiator is doubled, by what factor does the radiating power chh0 k1 *5jyat,di( imkpange?

  The process whereby heat flows in the absence of any medium is refe:r- dw hzkov+0rred to as

  By what primary heat transfer mechanism doefp/ 7l* eh)mzpb2izp z3ms)+ os the Sun warm the Earth?

  1700 J of work is equivalent to how o,ez+3sas,h ,tf 3steupb 4z gg)z)r:much heat?

  16.5 kcal of heat is equivalent to how much work?lg* 7(mt xd6idb3sh us1fcwtp+d.,3p

  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 ra:vaukg wo :5b.ise the temperature 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 2.0 kgps s43 jqv5.bm of water, what is the resulting temperature sm43.spvbj q5change?

  A 4.0-kg aluminum block is )/ezd09 i61 rf lrxubforiginally 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 -:oeqra2ene1 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 ba9n t0t(q8/ c5+ gfeakmsccb,vth 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 of8s)vo3mlqd/t*qor zj x+1- xe 0.10 kg of iron and 0.16 kg of copper. How much heat is as xxv- z rm8o1qe dj*tl)3+q/odded 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 heaq*c hhlq9sfh +1. ,c lm-4dxjbted 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 coppekds.ni) s5i-c3kt bv2r, 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 mz ki2uxo;bpo,g*4b: at $100 \; ^{\circ}C$ 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 isola (vfue:g/ :nkhted from its surroundings. Onf /e kuv(:ngh:e 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 e(x zioq r*u+hzvs171to 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.qexh(i*z u17+zrv1 os 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 distanc nqinkb(*v, ox y) ;6xfwpex6-e of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature doqbo*xenw- 6vkyx)6x;, nfi p(es the water rise?

  A 200-L electric water heater uses 2 kW. 4 q; m)p,*i3:xeyh1jv0oyufrs*ny im Assuming no heat loss, how long would it take to heat wate*mynhesr 3oxyui;*4:,qfj1m0)pvi yr in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How +n2k zn6g,p1 x2ingphlong will it take to heat 20 kg of water frg 2npx2np1ki+h, 6 gznom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000 g, a,x ;aon 3x -(em;varxu zj27iy mi84u$c = 0.22 \; kcal/kg \cdot ^{\circ}C$) 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 (specd4.n1y n): rkreab)hcific 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 vh :yhr6 .t+rwto change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. g ;p he4t7eb4p How much heat is required to melb447eppeg ;tht 200 g of ice?

  How much heat energy is neqm n: td*fx3h 3ds2md6eded to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 10n4c ja3tvwzu o8 plnpf +1) uga,v32mg u61hu-0 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When+9l*e;(g+ bbzprun y7q )zgzn 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 initialyh 4dn 0a)be;lly 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 a2n -jj *kh4fdxudhy:n +/6fcit $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy bbkf .7:p9 qneis needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to chang3)0vk3e3 a exl4cuk+kmlou) pe one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g xl2m.rua -u*t:z7r e tr.3cx e6e,v ykof $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea f:d ,tre60sg sby adding ice to 1.8 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 vapj5 bys672 bhwf1oluk8orization is 207 kcal/kg, and its melting point is2jlu5 w 6o7bfk1ybh8s $328 \; ^{\circ}C$. 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 conductivit )d5qw )h1bp;se yr0fupu7l:ly 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 ofda au2 og8j8-px g. q.vwdn( *oi(yyiu75mp7 o brass. Two rods (one alumi7g8(u57v( xmq iia jgdn .po.y*upao8do w 2y-num 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 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 3.0 m by 1.5 m. If t*vo t3b8(,p,(a.5y2n q; wdaeyc*f njptqi mkhe outside tedefq;jt*tya(wcva2 k*qi(p,5mp .o n8 b3ny,mperature 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. /mygq-6vjho10edt yg)1 j xs+r/1dci If the outside tempe d6+ y/ jy0ejg t1g1ci -hxs/voqrmd1)rature 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 ioe4:ysuocsmxu:h; f1ww;jtezhp(.y z *0/3mn 1.0 hour through a 2.0 m x 2.0 m section of concrete (p4yyjme:um:xhws.0u*sfe zwc;/o( to 1 ;h z3$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 8 ,e tn/khpeexq oz02gen .4)utransfer 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 i4v9nhzb+( lk4qo cml:93n h lnf 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 moni ps. bg/:i,vbztored by measurispb.:bzgv,i /ng 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 radiating energy when it is4r :4z ycayxs2 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 collechuf5 ia f 9bwl sm;xn,:v52b9ltor (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.