Which of the following is the smallest unit of heat energq(daw1v8g; q by?

  The amount of heat neces.qir*p/ . ez0kqy jw:2e qckx5sary 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 individual mlq83c)o lo56tw+clnm; u7 vxlolecules is referred to as; m c8 xotwl5+l37loquc6n )lv

  A cup of water is scooped up from a swimming pool of watxlc)a;l wa;v,s; 4yav ;1jri ter. Compare the temperature T and the internal energy U of the water, in both the cup and ia;lc;lv ja,) satw4;xv1;rythe swimming pool.

  The internal energy of3ilp vb 8y i*ps: gd:3irlki)*ka:5yv an ideal gas depends on

  An ideal gas at STP is first compressed until its volume is half the inrgya- i(:oi))u;-sw 5sku n ezitial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is done whuk(o-)-isyu)n; gr ei:w zas5ile 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 U at li +, ya fox2yxdjg*e07p4 lpqwfe),-$200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vagwlp 7l3j /q7 tkuu+a*ry drastically is that

  It is a well-known fact that water has a higher specific hea-bi1q :jzj 3)a)ju9iuer ogt..o ks2dt capacity than iron. Now, consider equal masses of water and iron tj.9brjtou:o2i3gk -szau) qd e)1j.ihat are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated sys9zgma( moah4 -tem is 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 capacity of aluminum is more than double that of4 mm9g-z ao(ha 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 cde,7cy2.z5ib yer+ uw hange a substance from the solid to the liquid state is referred to as tdz5eyrw7,cyb u+ 2 .eihe

  The heat required to change a substance from the )kr6j re6iaq )liquid to the vapor state is referred to as kra6r)6ejq) i the

  If heat is added to a pure v- y0wri1i cvm9dz:0ikcu 19, tx8uxksubstance at a steady rate,

  When a solid melts

  When a liquid freeze*eqjn:,k:b0upb v a8))nmlads

  When a liquid evaporatesvnrux7ggrgt+: 1- lvgk 9a8d .

  When a vapor condense i1e-evly)(q7rvr3eu+ff u;d s

  In a cloud formation, water vapor condenses intols lo; y-daho 92o,zc6 water droplets which get bigger and bi,;o-6l9soc zda ohly2gger until it rains. This will cause the temperature of the air in the clouds to

  Turning up the flame unwc2y k)+2 t9r rrjbas9luusz6ym*t ,)der a pan of boiling water causes

  Equal masses of water atdv.uk0p5fv vi a7sf./r, sze7 $20 \; ^{\circ}C$ 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 is referred to p*rb3 m) udf9na)9ndf r 3pmub*s

  By what primary heat transfer mechanism does one end of an iron bar d o)l-p u1lvj/je j7:sbecome hot when the other end is pla u1-):l jlo 7svdjp/jeced in a flame?

  On a cold day, a piece of metal feels mdd-6u 5q:f8akbv1wlmuch colder to the touch than a piece of wood.mu6dbv d- fqak8w1l5 : This is due to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous materiw6nosb 1z 3o*xal, the rate of heat loss for a gzb6oow sx1*3niven temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placoy .1:hmd;r(r;qzi nz ed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conducti.z1 ; mi:hrr; ynqod(zvity of the composite sheet?

  The process whereby heat flows by the mass movement of mol0akcs8 d6geo1bi m7 3zecules from one place to anothk 68sg d3mo1e0i zca7ber is referred to as

  By what primary heat transfer +b q 15wc;itfhi.jis ,s*(azsmechanism is a pot of water heated on a stove?

  Convection can occurkbn qq e35*an7

  Which of the following best explains why sweating is importamh -dvz). at3ayua 2r(nt to humans in maintaining suitable body tem atdha.2(u)-z 3vyramperature?

  A spaceship is drifting in an en5 h(zoutm/46g 1 elih49hrwd ivironment where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an ele/ d(4zlrmeuow6h gh5ih1 t i94ctric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materials. +0niy io6bi+o One of the houses has twice the length, width, and height of the other. Under identical climatic conditions, what would be true about the yi+6on +o0ib irate 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 doubled, by what factor p qr,kjune,sz4p ;,ib: 0y8xwdoes the radiating pow b,ny:p0 8,siq ,rz;j4pex ukwer change?

  The process whereby heat flows in the absence of any medium isqtg-r59bls n y.h2 ,1xlrrty/ referred to as

  By what primary heat5 b x2xphd(0kr transfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how m+ avf4; 7zn xm puyvl(p(a:p.ruch heat?

  16.5 kcal of heat is equivalent to how much work?f vyv2b*1a(d;cu ezq0

  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 leaj1+ucsmm b;oqp3hs4 3 d ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of,df6 chhq3g*u 4y :exl water, what is the resulting temperatureg4qe:l h3dh6u * fc,yx change?

  A 4.0-kg aluminum bljzno (46s(h+z/prawc ock is 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 theel/bj0(j,j axv:szp 7 temperature 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 by adding 5.0 l38i3 lgu3 zvcL 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 ironydfe/p s3is-; and 0.16 kg of copper. How much heat is added to thd3 -;p/efy isse 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 hem+ /zh(a2 ol/uy1 +l o.o2tfxf)iyxfyated 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, init y 8e8xx/jgpg7s58df+ajl4wkially 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 25jbz+1 +q2pwaz- gx l+acdum $100 \; ^{\circ}C$ 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 syx3 n/(l m*e.fiyhv 7 .d3qprvqstem that is thermally isolated from its surroundings. One object ev ylmnr3xh(.73p.qi*dvqf / 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 ex h35*y x0c vwnzesglf*z+/5jr plore the relationships between various 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 vertzzgj5x */0 vh3+lwen* fyrsc5ical drop of 20 m?

  The water flowing over Niagara Falls drops a distancp bk4u,d. mxk*e of 50 m. Assuming that all the gravitational energy is converted txd4mk*.kbup, o thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how longcgf4))4i5 b3i xfmni yu+rs/x would it takeb)cm4i 4riuxi +s3 5f) xgyf/n to heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to hetuow7i*cc*u9 ff4zcx y3 itrc n0:09wat water. How long will it take to heat 20 kg of water frnf wt4 w*fx9ucr :c0i3cy7zuc0t oi*9 om $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000gc t:xj6lgx(* 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 4l/ aiq)rh qx+i/+kh3joz mw yb,z3r7 (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 to:6epzu )cv2 ix y-zgllsy44 b; liquid?

  Ice has a latent heat of fusi x):9dv :su- 1mzhyp79wu.sbc0evwog on of 80 kcal/kg. How much heat is required to melt 200 g of7pux).9 wds9 ::bv sme yuzvo wh01c-g ice?

  How much heat energy is needed to change 10 kg of ice at- 6h 17keek s+7u9bwtvv2aumt $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed 4 /xzjdxoawr73 tf* ro.wi76gfrom 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of i5s2glw16b7dni cvwzt5g 5q161vy m3btvd 2 qnce 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 inu0j,5h.xop5 w iv7-c eawe. xtitially 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 a,y2h 9:i zbu5vmoils8 t $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is neede i*a4/c cra:,gs6 kpsod to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to chpn7*+7 ngq gvsumj( ,wange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to changebyp tzqcr nf: ix6w9fny,- 9nw9) 1b9o 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 teaz)b9 8cnrsp5qj dhd,., 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 kcale 2xrs;4o5fgp/kg, and the heat of vaporization is 207 kcal/kg, and its meltes2; f x4grpo5ing 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 concreteho swk.ode :ux):gy2* 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 twued r(ub 4f+b/ice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are ofu 4f/dub +b(er 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.oat62f8 vby-9ge;qnx5 m. If the outside temper8ybeqo x;9v 6at n2fg-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;z,,swv xn:d v by 1.5 m. If the outside temperatur,,vxdz ;w ns:ve 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 th4phcjh4 d4g z1rough a 2.0 m x 2.0 m section of concrete (gjdhz41 h44cp $k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1,000,0s t1 1sxm(f5cu00 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 m .bwp2jdxkri f48t8( 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 temperng6fmlc5*z14,u ps ym(h:p uk*okp9lature is monitored by measuring the radiant 9:sl4n ykmhp*u6lfcg ,*5mo1 u(kppz 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 is atg)wyc4dw 9or1a1n x )t $33 \; ^{\circ}C$? 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 (effec ad.x e21z8pp(hsmxu 6tive 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.