Which of the following is the smallest ufm2zq nl8m:9kf9 v/yf:)t9fwdmq f a3nit of heat energy?

  The amount of heat necessary0+nxufi3- rlz4 9crxg 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 jg5j1/g4m qjoiwb*;findividual molecules is referred to asjm bggo/ji;14jw 5*fq

  A cup of water is scooped up from a swimming pool of water. Comp3l8u ;iqfq: n ped;n:;9got bhare the temperature T and the internal energy U o9 ldqf;q t:;: uepni3n8 g;ohbf the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas dep2+yur l) ecyx,ends on

  An ideal gas at STP is first compressed until its volum y,m)acu +pt6ae is half the initial volume, and then it is allowed to a),a+ 6mt upycexpand 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 be

  An ideal gas with internal r ;rhe5rvx 5yr3 9nqu 7fuc 8wij*2xg2energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vadl9f+wiwov/ 9 ry drastically is that

  It is a well-known fact that water has a higher specific heat cuqtw 5 qeo960 3ixn7hz thlu81apacity than iron. Now, consider equal masses of 6ih 5tlu9t 8zqq3ue 7o0 1nhxwwater and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system/bmh:jpdrjdk 3 f;80a+ )d4.lvccjc x is made up of a hot piece of aluminum and a cold piece of copper; thecl+x m) :d;j0acvdbfc3p k4hdj8.jr / 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 equilibrium?

  Phase changes occur

  The heat required to change a substance from the solid to the liq;lf:zt lz;b5 auid state is referred;fll z;zab5:t to as the

  The heat required to change a substance from the liquid to the vapor sta5v i5itjan9 9jte is referre9 jvi 5a5t9nijd to as the

  If heat is added to a pure substance at a steaddddc y.fx (1pgq;1g k9y rate,

  When a solid melts

  When a liquid freezesuk9q2 no4/af i

  When a liquid evaporatqf8lj o)yns3 ;es

  When a vapor condensesavp9oq 6bb6k2sxa4u5

  In a cloud formation, water vapor condenses into water droplets which get b5*iumudxm.4 t igger a.mu54 ud mxit*nd bigger until it rains. This will cause the temperature of the air in the clouds to

  Turning up the flame under a pan of boiling water cauzt*zy f2pg (*jnby (:a .d9sdcses

  Equal masses of water at 1bern* 7m:qx))st+bth ovz+o$20 \; ^{\circ}C$ 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 me3ujx(lafl t4-.gc6kl ans of molecular collisions is referred to as 4agc6.fxljl (3 ktu-l

  By what primary heat transfer mechanism does obl b efv//:0gine end of an iron bar become hot when the other end is placed in a fl0 b fe:glbv//iame?

  On a cold day, a piece of metal feels much colder to thk2h xckprmy1l3f, c-)e touch than a piece of wood. Thip2)1lk3m yr,x -cfkhcs 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 material, the :l(+ +jobpygd rate of heat loss for a ( ol+g:bjp+ydgiven temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed on a layy q3m 80hq+pls7hd f/oer of another material of thermal conductivity 2K. The layers have equal thickness. What is 3qs07 +mpl/hqoy d8hfthe effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecules from bjhxx a /5.4sef17cmh g2a8 uyone place to another is referrej82 mha 7cf 1xgb4asu/ h5.xyed to as

  By what primary heat transfer mechanisgi;t jro/4)mmfjomo(h bx7 3.0wc3r x m is a pot of water heated on a stove?

  Convection can occurp0gju 7w3 )c4ygkme d8

  Which of the following best explains why swb9fhi99nk pk 5eating is important to humans in maintaining suitable bokph9f ni95 k9bdy temperature?

  A spaceship is drifting in an environment whgjfyf5 a*85 taere the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convection currents caused by5a *af8fg jy5t this heating?

  Consider two neighboring rectangular houses built from the same materials. ecv)x h69hxv. f8z dq8One 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 the small house, the l x88)9vhevd .x6c hzqfarger house would need heat supplied at

  If the absolute temperature of a radiator is u-,/ fccrt8 9gh)bxdfdoubled, by what factor does the radcgcff/-tbhx 8, ) 9rduiating power change?

  The process whereby heat flows in the absence of9pcf/mk c)4ln any medium is referred to as

  By what primary heat transfer mechanism does the Sun warm the i309lwbor5ip Earth?

  1700 J of work is equivalent to h 7w- hf eaka:-deo1iq8ow much heat?

  16.5 kcal of heat is equivao9. ds-7jpdcl8z p5x plent to 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 th+bkq gq73 ic7je 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 zku4i xj-pdp; (nn3u -xwg*t,water, what is the resulting temperature chann xu-3 xpwkd,;g4jti-nu*(p zge?

  A 4.0-kg aluminum block is originalm j7wgnqup/d5 (cmy:q/wo(u8 ly 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 temperatuxl ,gtki:x/u 7re of 2.0 kg of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to he; 0aoy3ku hag*dy2y7hat 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. H e0yw0u((/ )ucyti qcxow much heat is added to the(ucy0qu )y0t( wie/c x 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 w au12*yhsv2 qs2,*e2bvah ja 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 cs 0v, qn22sw djb+,i9kmk qo4uopper, 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 a2(yqw bg9 7ztzt $100 \; ^{\circ}C$ 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 its sdxq6;ik: m9klurroundings. One ob; ix6klm9:qdkject 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 the relationspi ,+ 7uzmj6pgh pxd6(pc, +tyhips 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 u6+x j,m(phy+ t,pzd6pi cg7p expect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara y (jnnzg--m0o 6hx6oq Falls drops a distance of 50 m. Assuming that all the gravitational energy 0jh6my ox6 nnq-z( go-is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heaterh8bgc7k,*+qs abp- vc uses 2 kW. Assuming no heat loss, how long would it take to heat water in this tank from8a,+gp-s* k q7hccvbb $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heat f. oyq mpif 46 5hvq/t6wsf,+. vwg5xo20 kg of water fi qwp55 ho.g6fm+/v,xosyq vf .6t4fwrom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (maci/;* 8btl tb ,bhn6rcss 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 (specific3(wby .vze9 nw 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 removey-:r0daob uw)p5m; ehw q, hlj x)id*3d from steam to change it to liquid?

  Ice has a latent heat of fusion of 87 z(r; hcvkc2u0 kcal/kg. How much heat is required to melt 200 g of v7 z;ck2rhu( cice?

  How much heat energy is needv.uf9lu+;wij8dr7/q1mb;jj l.x k h s ed to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be rrg7+oi,m rnz4( lkh s (h)mzb3emoved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kgs*9ktx spng61 32ppwwrolqqi 31*/ r n. 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 in4j+:bea jc (60iu1,kvj.o vfc*gwb mwitially 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 aq, ,jycpr1p :,9 iwx:dojq3v pt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy id) 4bnya8w6 :uf5cikis needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to co u *bkm7ud 1yuc4wp0+hange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change(nek+la6 yio1 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg 3plhm np .r8i7qo4/yy 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 vaporizatit 00sl7l:7fhuz5p)5xut v;pqj f g 7dron is 207 kcal/kg, and its melting zg :vj0)lpf0h; 5 uxt57p srl u7t7qdfpoint 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 con ev42.oiqzed tjnp2 :e4*d7ct crete 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 alu+1 ylan)uo1m ys4 c3arminum is twice that of brass. Two rods (one aluminum and the other ay 1mnl1oyu+c )a4s3r 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 the out7nnznmbb8atukxj ad9y2rcv +w5432 /side tm2ay 9vr24wat5 z78buj3 bd/+cknnnx emperature 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 outside8g :q0 g*nwjlqsm5 ;hd tem* q5h :8lsj gwmdg;0qnperature 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 throa sej5q)p+u5 xe0qb6 yugh a 2.0 m x 2.0 m section of concrete us+5)q 5 6ybjpaqe0xe($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 e 4 myc6l;ziv.bx2r1p 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 io.nzt3yp 4 uqfw3 o/ :1o2iotbf 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 refini. f a- .muikfg-kughm(rqh/53ng steel, the temperature is monitored by measuring the radiant power emitted through a small hole of arkh.fm h- . /3-(gfgu5rka quimea $0.5 \; cm^{2}$. 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 5t -2od ak hu6wqxvfd(lp/;:x 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 collskbj 9ea4;e)tector (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.