Which of the following is the smallest unit 7sfb1 /)nx trvof heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of wa.g5wy p) t.cos8:bfz dter by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic ehb q-d-ocd1-qnergy of individual molecules is referred to qoc-d h1-- dqbas

  A cup of water is scooped up from a swimming pool of water. Compare br, xne8bz7 w)the temperature T and the internal energy U of the water, in both the cup and the swimming p)e8 7b,zrbxwn ool.

  The internal energy of an ideal gas deper2hc;7j; v ezjnds on

  An ideal gas at STP is first rwwx55f . 7dhwcompressed until 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 temperature constant. If the initial internal energy of the gas is U, the .x5w 5 fdw7hwrfinal internal energy of the gas will be

  An ideal gas with internal eneefy6zb jednxi/c0s7m .p.9h8rgy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do n4pwq rg422y igot vary drastically is that

  It is a well-known fact that water has a higher specific heat capacitw/ht (ex qst;du5nr :8y than iron. Now, consider equal masses of water and iron that are initially in thermalrt ;xdsneq/ 5w:tu8h ( 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 alumidxq,t tpq60 :h 9uqk1- ,tpmog9kd-zt num 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 expemp61tu 9: h,qgdkz0,kx t-tqt9qop -d riences 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 substan4e gvqu i5.p+52x6nn sz how0vce from the solid to the liquid state is referred to as tiwv2n zg+4.vn5us5x h0eoqp6he

  The heat required to change a substance frolf;c lc3 fj35sm the liquid to the vapor state is referred to al5c3 cfjs;3 fls the

  If heat is added to a pure sux9b26z s. ngvp;sg5l ubstance at a steady rate,

  When a solid melts

  When a liquid freezeqtx2 k81r s5y,tux g6js

  When a liquid evaporatz7.e g6qbs8y tes

  When a vapor condense.dz6uz*5vsve v7td o 3s

  In a cloud formation, water vapor condense; 0y o0.qqkcmrs into water droplets which get bigger and bigger until it rains. This will cause the temperature of the airq0crk0.o; qmy in the clouds to

  Turning up the flame under a pan of boilinpkv;entux saw;j03r. 2 ie5*2euy*rzg water causes

  Equal masses of watey54h;;l1ib)/ lhwery bmj u4pr at $20 \; ^{\circ}C$ 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 91 fos,:gt0qw tjkll*heat flows by means of molecular collisions is referred to as:901 tsl jtlfwoqkg *,

  By what primary heat transfer mechandm- rqyxy r8mfl o.7q,bwm721 ism does one end of an iron bar become hot when the other endlr2qmyfo 7mmy wq xbr1,d.78- is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a piece of cn1ub2; 3 ur4 ziqf7pygi3x3 wwood. This is duen3i3c1uwxgpur7i q2f zy4;b3 to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneou9gl(5vg,fu y ps material, the rate of heat loss for a given temperature differencev yu,gfp9( gl5 across the thickness will

  A layer of insulating materiaeer( 8x p*c8h mmig*ob* cc0w)l with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layerswe *mc*im(h0)ecc orx8p 8 gb* have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows pa0:4b9ag;scolbgze.kntcm 2fvge 6 /3 5 r6tby the mass movement of molecules from one place to another c bm:g520aos tr6g az.et9; 4/bkcl 3fngevp6is referred to as

  By what primary heat twz4lf9 e,+ )8fsoebdp ransfer mechanism is a pot of water heated on a stove?

  Convection can occurkqa,e+pa7;vvn fy:.* mu yfn3

  Which of the following best explainshk *yv,s0;h78jxn q jm why sweating is important to humans in maintaining suitable body temperature?xh qkn sjm*jhv0y87,;

  A spaceship is drifting in an environment where the acceleration is2)ku.+ytd bof gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the )i.ku tb sdy2+convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the s(w, 7gi:zy wp+1vhs nyame materials. One of the houses has twice the length, width, and height of the other. :g,p w+iw (yvh7y1 nzs 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 temperaturj n:n:55m6ab.);qbbvjgz qtve of a radiator is doubled, by what factor does the radiating pobb6.;v) n:b gj:z5mjva5tqnq wer change?

  The process whereby ho5u pd8 : 2br+:iayse0je7ygdeat flows in the absence of any medium is referred to as

  By what primary heat transfer p4gs)t fu8fp(seku0x n05; ysmechanism does the Sun warm the Earth?

  1700 J of work is equivalent to h rejrx61 uhfmt19e +0dow much heat?

  16.5 kcal of heat is equiq(; 1gi-qaenkfq2 l6v valent 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 topo 7zgq5 /kolhco c*m:( +w4mn 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, whattzqlk / kgdf)yxmu5v 832x 53l is the resulting temperatur xf z5m3q8l)v3d5t ky/lg x2kue change?

  A 4.0-kg aluminum block is originakucy pna ele m 79xro(;-6wt*7lly at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat rais5t4z 2i )ge*zymat 3jv 3q.jnues 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 up her bath water by adding 5.0 L of wapozy ru3bs5l d-7v5/s ter 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 rpvy/; 42 iw31xqus- tn ek3sc0.16 kg of copper. How much heat is added to the c-k 1y;w/3xps2r tun4sq3ei vgear 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 heatw +,lc8 odtuecx.w. 3-cst5lbed 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, initialv+u.wfd3;*hzfw92 iy mnw gj4ly 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 az c*/9gifg 5nqfy ,9zht $100 \; ^{\circ}C$ 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 l)z g3an+td+p(f)sjo make up a system that is thermally isolated from its surroundings. Onedpnjz )lf a+o+(3gt)s 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 to explore th;vvj,.4rcpyt+b 3pvehhe1a 3e relationships between various forms of energy by measuring the rise of temperature of water w.,e3hje;r +1bapvpt43h vv yc hich had fallen down 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 Niagaraj*.r/ vyup v,p3;wzcv Falls drops a distance of 50 m. Assuming that all the*p c uzpyvv,v; ./rw3j gravitational energy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming nod pz wf7hd;ht9m q2ew3(+ h/:wnljrj/ heat loss, how long would it tam(tdwndjq l hrhf;w7wep :/92hj/+3 zke to heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is u3 ef.:9tk5/gjp yvit2g:argksed to heat water. How long will it take to heat 20 kg of water fro/k jv2 p ygi9 :f:ktge3rt.a5gm $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000. snb:hd 2*afl 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 (specificyb4rwm+ wrj. 1ers o*6 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 rvq :q(i c5qr2nemoved from steam to change it to liquid?

  Ice has a latent heat 9/cp r5fc muu.8jh 5u0;snaqr of fusion of 80 kcal/kg. How much heat is required to melt 200 g of ajn9./u8p; hr qm05frus ucc5ice?

  How much heat energy is needed to change 10 kg of icem5,hd ns/kw9 q at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from*4i6ggwdk (v e 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When ouyljxc4n 0n ok;:kw895xo y)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 ini io;u .onpt.lt83-krytially 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 aj) fxlb:s+hdlu+e jq/. 89zcot $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg o)t.da0s1iwmto g moo j:py+/+ eex zkx04a68gf water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to cvzhj3jo2,5x nc2 k4z:xs nv yxy51gv 3hange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g oft/l wwf -4s 93bchx2iq $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by7+tkfwr/ p9nl 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 lead1et.nghy,ah0h4h ho. dxrf9y .66jpk is 5.9 kcal/kg, and the heat of vaporization is 207 kcal/kg, and its me4 k j1,h6h oh09r.fghp.d.6hxyaty nelting 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 cpgnxzn;7,v3 vudp j4h3 tc,9 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 conductivitw ud3*uscb/q lm7c.5u6 efnf+y of aluminum is twice that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rqlfumsd3uc 6c/w .u f +en*b57ods 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 h2, ly2v;2lsj/mg8j cuhz c,j1sh.l i of 3.0 m by 1.5 m. If the outside temperature is msl2 82slh.,gvch;1 u,cljj ij/z y2h$-10 \; ^{\circ}C$ 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 3gzpy4b :4nv .qg+zsaoutside temp3 b44v.qz: snagzp+gy erature 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 4uep6 z-eoo2pof concrete po- uze epo462($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 tran6yzqx k-,m+ei8tvw-;1yr z5zx cco2esfer 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 if 4000 kcal of heat is lost throug4yj m s0m)hvq xz5k:.ob0zec;h 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 furnac9i +n, ae b- zxr5tblu8;u;uose used for refining steel, the temperature is monitored by measuring the rinz89bxu;ra ob,5e ;+ us-tluadiant 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 5zap;.g,rrbi body radiating energy 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 collecthb/4s d-7m tk4jfa. syor (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.