Which of the followinghxxh 8*yf:+qc is the smallest unit of heat energy?

  The amount of heat necc c(qtfi/f6id 83 3irbessary 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 individua8-xe5soq1) fpsvfo ; ,dqq-c5fhko b6l molecules is referred to a h xq6-oscsv5o qpb dfk5)-, ;8effqo1s

  A cup of water is scooped up from a swimming pool of water. Compare the temperafcnc d8 l48z2xture T and the internal energy U of the water, in blzc x fd8248cnoth the cup and the swimming pool.

  The internal energy of an ideal gas depex0jo8b57mry. t v: jdtnds on

  An ideal gas at STP is first compressed until its volume is half the initial vo k:v)ej4c/w om*v:ux plume, 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 internal energy of the gas will:mc/*)vpj:x o4evkwu be

  An ideal gas with internal enqbl,. xa5j o,-bdfw 4uergy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperature9 e5fh3nzs*.(k/ 9vxetn tit rs do not vary drastically is that

  It is a well-known fact that water has a higher e*/kj gyq+xc,specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The s,kec*/gy jx q+ame amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of a hot piece;i(nw a65fxh rm 0f:ex of 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 takes to reach thermal equilnmr;xfe0f6 w:h5 (ixaibrium?

  Phase changes occur

  The heat required to chnnvw4or)u+k h9i od :j.4vq8hange a substance from the solid to the liquid state is referred to kw.u4h)+nj oo i:nd rvqvh894as the

  The heat required to change a substance frwdjyk6 ;yortl42+ 7e zom the liquid to the vapor state is referred to as ykd4e6 or;t7zw+yj 2l the

  If heat is added to a pueat; ivd8t b-xk,zp :7re substance at a steady rate,

  When a solid melts

  When a liquid freezekq ):6oy ad1yxs

  When a liquid evaporafr 5d mfz t3eq.h3sf6;6ls;wltes

  When a vapor condenses1 pn8ee25d7fs8 rraqy

  In a cloud formation, water vapor condenses into water droplets wh zbqyq8) ey.4-wkjh x3;, bjbbich get bigger and bigger until it rains. Tqbxzhke-8)j 4q,wb by.y3 j ;bhis will cause the temperature of the air in the clouds to

  Turning up the flame under a pan o71x l3eh0r2e6si bsu wfn49r 7/elok hf boiling water causes

  Equal masses of water nwhvz;;gz w 75at $20 \; ^{\circ}C$ 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 iuwh w j3*r* mp/fqp79as referred to a ru9**qawfphm/j w 37ps

  By what primary heat transfer mechanihr9 vjzzx-g39 sm does one end of an iron bar become hot when the other end is 9h9gz3vj-xz rplaced in a flame?

  On a cold day, a piece of metal feel8t*2ljg0x5a(o b j,n 9rmofdls much colder to the touch than a piece of wood. This is due to the difference in which one of the f50o, gtj8j*rbfdnm9 l2 (axloollowing physical property?

  If you double the thickness of a wall bui vbyk)z 8jjki,9fn1(m+-emda lt from a homogeneous material, the rate9i -8+1mvjzbe d(, )fnajmkky of heat loss for a given temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed ufl*a; x*ow( kon a layer of another materialo* (kuwla;f x* of thermal 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 movement ofwg/,j uc3atba1akd. 9;wz6 ue molecules from one place to another is t1 a 6z .3jgu9 wdec;akbua,/wreferred to as

  By what primary heat transfer mechanism is a pot of water heated on a s ,eo:i;1as s c 2-ms,serejn*btove?

  Convection can occurt jz(:y.hdkn,7jr d6t

  Which of the following best explains why sweating x ;sn 5wa2gq6ohian+p. a*z-ris important to humans in maintaini nz.war5qag+n2asi-p x o6;*hng suitable body temperature?

  A spaceship is drifting in an environment where the acceleration of gravity is eq2g9pdv .0rc xssentialv r.9dgp02c xqly 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 this heating?

  Consider two neighboring rectangular houses built frb+*uchof6j. gom the same materials. One of the houses has twice the u gjc*.h+b6f olength, 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 rp*l es-3nm2a7dx2jgsy 8aje f d+2u;vadiator is doubled, by what factor does the radiaaasj; spf7jmvy-x+38 2d2g n*2u eedlting power change?

  The process whereby heat flows in the ev 4stc8 k37refu0 4suabsence of any medium is referred to as

  By what primary heat transfer mechanism does the Sun warm the Eart xtl6+ f1nypy)h?

  1700 J of work is equivalent to p8ffr0 ao:bjz),cd 5ak8 ,d*2k)vph8 gkzzig how much heat?

  16.5 kcal of heat is equivalent to 2ut 64y,q1kt a txi 0sfov2qbj:i9xh-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 temperaturzy/:r c,tm8 ueol5eb; e 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 kh3azpb37nx 6u g of water, what is the resulting temperature chan x7bpn6uz3ah3 ge?

  A 4.0-kg aluminum block is2w4mqay ct/w+n5/ejpo t:on . originally 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 of 2.0 kg of hx:a4:uvged/z3mnck3n5dc ( material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heprjd7x(- ywm9c xgpm .s2(.i eat up 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 l k/ep*t,hf6v 1w; + p;6ave fpxwj-hwmuch heat is added to the gear if the te j*hwpfltf p1k /-+6pwwavv ,e6hx;e;mperature 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 heatxx+.;l7.r r dbxq6iuof5q/twed 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 coppe- 0ogrs gv (nz949 o+akrw9nzer, 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 agrl p9)o s3+iat $100 \; ^{\circ}C$ 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 dnaz +kw;sz r+c,(1bzis thermally isolated from its surroundings. One object ha+z(c a1krbz+,wds z;n s 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 relationshi 7 5aa,wqonmbk0x*4wj5yec t:ps between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximk7mn*w c:q5ajet0 a,xw y4b5oum 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 that 8cjphhj7-mi n d9e-i. all the gravitational energy is converted to thermal energy, by what temperature does the water in -hm jc78 -9hij.edprise?

  A 200-L electric water heater uses 2 kW 3j -4 rwwyrexcn,+oh.. Assuming no heat loss, how long would it take to heat water in this tankrrxcn3e .,y-jw+ h w4o from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heak4pdc):udvm+) hu;rc 0a 0 zjgt water. How long will it take to heat 20 kg of water fro :g) dhv+u ;dc r)0p0mkjzc4uam $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mas u0c jvp0asw04p ns (kty8pp99 c.+ssns 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 blade 7k d0 /jp9sedp(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 t7w 29g-dy xlet90c dj)y 2,*cdn tyxoeo liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is requirednru.wk kw51fiw6 1uyo2z gkyb/4(gx; to melt k 1y wkf; rxyi1/u4bguz ng2 kw.6(w5o200 g of ice?

  How much heat energy is needed ts+v79b 9 ;myk* hlk qua-zbwq9o change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remo5z6nj. gz *,jyhqy (k2t*d+tlbjlb h2 ved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When1:a,u sam/ ,vswj e; t.eg.fyk 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 initially at g3 holp;+rxm4 $100 \; ^{\circ}C$ 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 ata ze5 +c4 lql-bb4w.lh $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10j(-5l;/ qx cxx, c44xusflfk m kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change od ytb6zjk.utyf6;;nd6 lc),n ne gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is reql0 nhwq(4b9atk 7 (zlluired to change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding t b67 4ahj4aom5 plbr70qrb j4ice 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/kg1n; ij-8cncw 4x -zpca, and the heat of vaporization is 207 kcal/kg, and it cnwcxji -n1z-4a8c p;s 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 concrete isx22cgmpz1 ,f 5csol6mka2 4nw $0.8 \; W/m \cdot ^{\circ}C$ 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 xf jg-4p *fso(6e nca;9v cb.pis twice 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 equ*-saff6 c ;p c4egpx9v.(j obnal 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 thickq;t-+;txb1;esvxzq a ,9 :vxylzfp7y has dimensions of 3.0 m by 1.5 m. If the outside tempery f;yvx; :labx1p +97xvz ; st-qeqtz,ature 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 s 8z)rn+ yynb51.5 m. If the outside temperature sy y+58r bn)nzis $-10 \; ^{\circ}C$ 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 concre:l ++h+kfg*z-ypnnj b te (h* ybkfn+g :p +zn-l+j$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it tak7 9e fx42jup pxj8yew6e 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 gfu/dlen0x13sp 01fh temperature 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;8klmat;upec -c7hd- monitored by measuring the radiant power emitted through a 8e7c--dm lhp;; ctak usmall 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 is atum)nr x0o 7*al $33 \; ^{\circ}C$? 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 collection area obk8 07uto 3xblf $15 \; m^{2}$) 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.