Which of the following is the smalles* pt/oozj, l;ht unit of heat energy?

  The amount of heat necessary to raise the temperature of3k9wls8te8 c q 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules is referred t 5gpk/u +) om.2pftqboo up5bp+.tm/g 2fo oqk )as

  A cup of water is scooped up from a swimming pool of wat;c a 3t1;9 h.n, rvrnznkk;ktger. Compare the temperature T and the internal energy U on3 ;t nh vtra g1k;9nrk.;z,ckf the water, in both the cup and the swimming pool.

  The internal energy of an ideal gaxz8vu7kw8 4vc6t.t wp s depends on

  An ideal gas at STP is first compressed until its volume is half qx(, /h /t+kse70yfebs8n)-rbff t lz the initial volume, and the,blh(e)fbyfz k/t0 e8s7 tnfx / s+-rqn 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 be

  An ideal gas with internal energy U ycm/ h)m2 657jfu hcfsat $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drastically me p8o d9xzq lu *: hhh:u5awy6g41cx4is that

  It is a well-known fact that water has a higher spec2 f f c,afiz.x:0tn73cp(zrvsv -vsr1ific heat capacity than iron. Now, consider equal masses of water and iron that are initially in ther c-z.nf:i(1xrs0s r a tfvzcv,f72pv3mal 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 aluminum and a cold v9*twsagi:iufs(,tshbh:( 8 piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity og uawb9 *hi si,s8(tft:(vsh :f 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 tgtf yigx6 7-zot/r1w4wf65qfrom the solid to the liquid state is referred to as titq 4 5/7f-z g6gxwfor16tywthe

  The heat required to chang df8 hmxg7*ktbgd a+o9efv, )ei2h5o+7 8oalg e a substance from the liquid to the vapor state is refe 7f,leog+ ahoafh 7)5*xkged 9io8v mb+8gd2trred to as the

  If heat is added to a pure subs./sx no *:olfbtance at a steady rate,

  When a solid melts

  When a liquid freezes(/3qx y im.h:guy( .x,tsgifp

  When a liquid evaporates eyt3fm7h5sz,q,mv n y-t5;ebkx.q s9g+1idw

  When a vapor condensi u-f m cq*sx tyb;.lta)y)6p*es

  In a cloud formation, water vapor condenses into water droplets which get big ) 5*xa2,qacdinkcl 2zger and bigger until it rains. This will cause the temperature of the air in the c*zil ca)2ndk5 a ,qx2clouds to

  Turning up the flamear2gvr)n; n v,5+y/ewrdlb/y under a pan of boiling water causes

  Equal masses of wate:thwq3a e/0 2e v),sx- juaoesr 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 heat flows by means of molecular collisions is rw (sh0ey uo1 nye-d6c:c5-p xweferred to aow(x eu5cpy6ednsc1y w- h-:0s

  By what primary heat transfer mechanism does onencyp*3 tc *)q0qxmx:s end of an iron bar become hot when the other end *m *qy:xqnctxc ) p3s0is placed in a flame?

  On a cold day, a piece of metal feels much ca;g0,mhrpuz1 older to the touch than a piece of wood. This is due 1uaph ,0mzr;gto the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous materia pp5 i j67zf+fxey;afh;rx.o) l, the rate of heat loss for a given tempere)fyfz ;fp. ;rpij7oxax5+ h6ature difference across the thickness will

  A layer of insulating material with thermal conductivity K is sq15jt4l:tz fplaced on a layer of anothes41ft: ztl5jqr material 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 of molecue)z:jx z/ am5xles from one place to another is referrz5a/xj)xze: med to as

  By what primary heat transfer mechanism is a pot of water heated on a stoveh2uufvs t(9+ qr.upa jh/j82h?

  Convection can occur ql+gd1u/kiu,

  Which of the following best explains why sweating is important to humans in ntfj )f o3 /hf3h:wqr2maintaining suitable body tempefh:)jhff3r tw o2/nq3rature?

  A spaceship is drifting in an envirol cx+p5 +nw.dxnment where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electricc xdnxwp5l +.+ heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same mat tfo,05p vhyh gcf:a04erials. 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 toy4 vo,5t h0pcaf:fhg 0 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 radiati6yn,+t1 dl:y kl 2cfmor is doubled, by what factor does the ra:k m lft1+yn 6dyicl,2diating power change?

  The process whereby heat flows in the absence of any mediumf)v +lma m;s*m./ uxav is referred to as

  By what primary heatdv3smm,9qw98 e3kov /gs xv0lm,hl 5g transfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how muou(f,/xo e+2b m4jhn3i7ufh b ;ob(xmch heat?

  16.5 kcal of heat is equi,*becl(d ja x-abf)g*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 to raise the temp4+r -ch9zv sukwkf v5/erature 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, what is the resulting tempw+,q p;rei4fferature changer4 efqf p,w;i+?

  A 4.0-kg aluminum block is o97o; z cvwsd/xriginally 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 tk* ru+pl: yxvm c84,ntemperature 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 addingb. ti ay9rp(g0 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.kaki 95f .a curx69-9sl fsyc. How much heat is added to the gear if the tecfua.lix.scak yf59sk9 r -96 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 ib mc,lv)r:k9had8-r 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 copperl p0n : ep0t*e7bqrwzeew 5a70qncr75 v)3amr, 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 atk:5k 3v,cxlen $100 \; ^{\circ}C$ 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 systep)spz 7,d k7rj +tzb8xm that is thermally isolated from its surroundings. O ,7+pstzk7bpxdr )z 8jne 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 the c+(d/auqn;3ehd0 t*haj2*tnt xli; e relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a wad/t(h 3xcqd tn;i+2*lja;na0he e*tu terfall 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 distlgtw8u oy8e 4qbh4giah 87)6gance of 50 m. Assuming that all the gravitational e)w8gb86gu744qh tl yhi8 goeanergy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. As;fu/h)kdw8 cgq rbc . x-mx6b 1 r)mhfn9fp(3ksuming no heat loss, how long would it take to heat water in t)qb-d.g 6cunp x (/8wmf;hk)3fbkx1 hfmcrr9his tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water.0 t:06p tfe3ziiunb(p How long will it take to heat 20 kg of water fribf 3pnt t0i0zp ue(6:om $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (d 5 .p4p8,dml7ga ajbimass 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 (sphb6e1c, /sm tlecific 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 feg c,hr ,jjsjq4; 46m1n a4kvrrom steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much hevo1- 1mqta z+yat is required to melt 200 +1o v-zqm1tyag of ice?

  How much heat energy is needed to change 10 kg of icernd4 +cmr o7y()epve* at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs t 17jd-)x grsceo be removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When 50 g of ice at l7bveqwf4 2 u1$0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water initially dz.je3 tts ,z 5ohns/)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 at5y8/z fdld br 0wpjv i1 alr/17ilzk(/ $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy 3a :sc 9xg5rvtis needed to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is reqivig l7jv; 53fuired to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change ju(i)2)t)l jzqs 3srk 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 tea, initidd- 1qqifrx1- ally 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 vaporization is 207 3vsu -kmf55w9fe .hv icg,tz9 kcal/kg, and its melting p gwm, 5.e k9vu9f3fsi -htz5vcoint 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 is b 9djjoj/ r4l9td0kk4 $0.8 \; W/m \cdot ^{\circ}C$ 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 twicks5s9 t t)2gnoe that of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. t5osn9k t2sg) 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 thi/e9,bq0i-,h ktm iy9kgby/6 bkwui.zck has dimensions of 3.0 m by 1.5 m. If the outside temperature iit-g, /y.zb9e9wu6,bi i/k0hmq k byks $-10 \; ^{\circ}C$ 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 riysi*r (lt 74f7 y8gdm by 1.5 m. If the outside tey4 *7iyrs7(8 ltgrd fimperature 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 a5h fl+az. p;;d)kf kjt.wj6jin 1.0 hour through a 2.0 m x 2.0 m section of concrete (hka;)jjlp jka6. ;fz+w dtf5.$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it take t..vqpnv9nr o 1oq9hq+o 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 temperaturjdnbbl 9v- p0+:.hixggqo */ue 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 smhq 8 +6xcf3grd l:ix,teel, the temperature is monitored by measuring the radiant power emitted through a small gi:l c, +xmh3xq6r8f dhole 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 radiatin 5*ngqf;tdpt0w s) m). qod6qt/bsg;eg 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 collector (effective collection area of 3za rsdb6vhekv616xd;s:u8o$15 \; m^{2}$) 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.