Which of the following is the smallest unit t ::je-,n bejh(m xth5of heat energy?

  The amount of heat necessary to)((: pczoryug8gcjb) 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 individual molecules c zx+ +/qcx8hi;vrh-fis referred to rh +;vi cz-qx/f8x+chas

  A cup of water is scooped up from aeo ay vi)(u42d;c (i7 j8z fp9dtbiai* swimming pool of water. Compare the temperatur*f7obtji d()aa48eizvc d (iy up;9i2e T and the internal energy U of the water, in both the cup and the swimming pool.

  The internal energy oulijh c.- lc00f an ideal gas depends on

  An ideal gas at STP is first compressed until its volumha 9ed lc/n8bd 6bp8n*e 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 is U, the final np*l ea889bn/6bdcd hinternal energy of the gas will be

  An ideal gas with internal e3pqjx q sen3 4/ne(p5erh )tib, f)ql8nergy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary dr3,shu68aoo ql0 q/ pqoastically is that

  It is a well-known fact that water has a higher sp3 np1mzbt onc8m./z/n ecific 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. Whi1.8 //tb 3 mocpnznznmch statement is true?

  A thermally isolated system is made up of a hot piece of aluminum anu*wf4h w1l se/d a cold piece of copper; the aluminum and the copplw4suw*eh 1/ fer 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 thermal equilibrium?

  Phase changes occur

  The heat required to change a substance from the soli zs jkz6q5 l,a:nrxg/,ta+n))x7cws xd to the liquid state is referrez:gwa)s,r +nnx5,jzct a )6x/sqlk7xd to as the

  The heat required to change a substance from the liquid to the va4sgzkyjo(ykt f8z 7,3por state is referre z7g(tsy4fk 3,yj8 kzod to as the

  If heat is added to a pure sxs ye3uu 35h-yubstance at a steady rate,

  When a solid melts

  When a liquid freezexd:,6e7b+rq f z6dk n(hfto3p s

  When a liquid evapor61q) y0ywi o,b y2hwruates

  When a vapor condensesk7zvc (zz qi j9vjl:58unek (*

  In a cloud formation, water vapor condenses into water droplets whicz5*jiza ++ duhh get bigger and bigger until it rains. This will cause the temperature ouzh+aid+ z 5j*f the air in the clouds to

  Turning up the flame under a pan opjjj/ cw2 nk.1 )yzfnt- m84ajf boiling water causes

  Equal masses of water ae7r2 p3 ) ofuebszn:+et $20 \; ^{\circ}C$ 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 fl jnqy94e*,zu eows by means of molecular collisions is referred to a9eu4jzy q *en,s

  By what primary heat transfer mechanism does one enuwhi (,crvm6 ,d of an iron bar become hot when the other end is placed in a fla,rmvhw ,i (6cume?

  On a cold day, a piece of metal feels much colder 7.h gt.g*nr- ,i 73ohtujmgbf4i)gnh to the touch than a piece of wood. This is due to the difference in whicjom7*gfi.t4h g hi-)r h .g bg7nn,3tuh one of the following physical property?

  If you double the thickness of a wall built from a homogeneous materiao6h,kjri7fz hkc5(z ii4a514u0lq d bl, the rate of heat loss for a given temperature difference 6(jii b4, qf0zl4okkh7z5c arh15ud iacross the thickness will

  A layer of insulating material with t5sr8 ky ghd u0qv doviq)61.6yhermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. qk 1s)hiuv 68dry.vqyg0o5 6d What is the effective thermal conductivity of the composite sheet?

  The process whereby heapa1f uwn)9 w.dt flows by the mass movement of molecules from one place to ad1f) apun .9wwnother is referred to as

  By what primary heat transfer mechanism is a pot of water heated on a stetgs*z)+, (rv1 (q7ak;t r2l ex pgeueove?

  Convection can occurg/ jt *iwsx7e4

  Which of the followin*o8r hr id 1m:w)2(,r omxdwfsgmo5 h0g best explains why sweating is important to humans in maintaining suitable body w ors1,rodrhig):8mf2*5hodm 0mw( xtemperature?

  A spaceship is drifting in an environment where the acceleration of gravityz 9viq0lol5,g is essentially zero. As the air on one side of the cabin is heated by an electric heate 9l0l5z,ioqg vr, what is true about the convection currents caused by this heating?

  Consider two neighboring rectans252zd*v d.rge w76z. a6cjz,kyp neggular houses built from 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 would have to be supplied to maintain the same inside temperature on a cold day? Compared to d* wzz.ysg 567evpckarez.6dn2jg,2 the small house, the larger house would need heat supplied at

  If the absolute temperature of a radiator is doubledp vn8;y5k;hk* .y kkcz, by what factor does the radiat;n y*k 8kp hc.yvzk5k;ing power change?

  The process whereby heat flows in the abs5wo xh,u k6 l*fh7pkr.ence of any medium is referred to as

  By what primary heat trans+q1rfx(xzb 3 1ry5 g,l 8qlmc /m)wnilfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how much het6 zkv/s*w72lxwb.pqat?

  16.5 kcal of heat is equivalent to how much 4, pvuu un8beq.3 nq;jwork?

  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 neehg/(lo6wt b1 u 2yqun-3fm-unlan/ a 5ded to raise 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 kg of water, wh, csvo qro5m.rnn0inyv6 *3/c at is the resulting temperaturcin0o 6/*no,q.cn m svvr5ry 3e change?

  A 4.0-kg aluminum block is originallz *m4)vqgs.zgy at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raisesy(ab) -mpaju 6 bc;fx3 the temperature of 2.0 kg of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat upo. ujk1zh.yn8( o 0 mo(6larfrrjnrp0v/i ) d3 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 of copper. How much hw23r0jz5q 1.p/ovh 7bsnukcu eat is added to the gear if the temperature increases h1w0jr57nobv2 .cp/3kqu szu 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 metax+f6b mml,ine5m+ g;xdtiun2 7 7 vc/ll 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 copjo14z:5mi h zkqsdke0wikc0 +v dr814per, 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 atjv x hjc (u+4wu13:fv3lqq4 zv $100 \; ^{\circ}C$ 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 theri hqelr.w8)3krzvq57j l 8h+dmally isolated from its surroundings. One object has an 7lkrrj qhh)8 .5ldzvqe83+ wiinitial 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 nngk.) dgmot .w)xo;e j):7zk to explore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen dzxmtn:).k ogkejg d7n ;w .o))own 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. Ass+uxyeta 1r4x z3706s dxdlxf)uming that all the gravitational energy is1 dxtxu6rz 0selda3 y xf)47+x converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, howb cmqvg+ v :7j;p.zt;s long would it take to cvz.q+;gjpvbt: ;ms 7heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to;+ mh2s c85, yxtj9jkn)wan hd heat water. How long will it take to heat 20 kg of wamyk sxhj h2ct+9 w8njnd5,) ;ater from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1vjuz w ,,xx /t139nzgg000 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 (specifc -h)dke(k t3 wmdro60 3s oeudab(/9lic 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 re qlo.(ut;ka+p moved from steam to change it to liquid?

  Ice has a latent heat of fusioul82evux7dv3 n of 80 kcal/kg. How much heat is required to melt 200 g of ivud l8x7v23euce?

  How much heat energy is needed to change 10 kg of, ppn-vc(gn t7 ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100 g zc +(kiuk,o (bzse4r+ja 7 *yt(r xn*eof $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80*c dcg4q 1nvl* 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 initiall: v +8ygbag9xj7 op.gpy 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 at3ft0 akxw.o4 v,ua9x m $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of wateo/5ht lhy9b( uklv:gkm k/9-nr at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to chang(awv ck+m f(9me one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g +fre3b/bxcw: of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg of hot t(l(i*cu 9jpnbdl(m/()li k / xvmonv0ea, 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 heayer jm+x3c -ie3mp;)vt of vaporization is 207 kcal/kg, and its x; y+erj33epvmi-m c)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 conductivityi691 1divuubps 5i)q x 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 ;) ry- ox(t2dtoj 5oa+wkmwkufbs5: 1brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengt -om ob+t;2r: )5wws xok( k1djuyaft5hs 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 thot0oq ;53f d9le dajv;ick has dimensions of 3.0 m by 1.5 m. If the outside temperat35f;a joqlo09d ;tedvure 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 t n fw-la4uhgo j52o*4femperaturaoln fwof44 guh52j -*e 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 in 1.0 hour through a 2.0 m x 2.0 m section of concrete k /x45bri86x(tozzm l (k6xrm4 oi tz l/z5bx8($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1,000,00hs .tn*ic x,s60 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 k n4rotjt4w13lost 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,(n4 .ute oh)qt the temperature is monitored by measuring the radiant power emitted through a small hole of arean .ohtqe(4)u t $0.5 \; cm^{2}$. 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 energm8 g7kq0v.dz*fdsey- y 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 . / vl35nneh :;ut1fof*zizoxcollection 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.