Which of the followingt uz.lvvq 5t.arp17- e is the smallest unit of heat energy?

  The amount of heat necessary to raise t t w bp/:n9kdvbmgtod3:m/)*ghe temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average,oh 2q,nufh5 zee7(yx 9kczd7 kinetic energy of individual molecules is referred to e,o277dz5,x9q(fk enzyh hucas

  A cup of water is scooped up from a swimming pool of water. Compare the te2f zn/rkf0 5zwmperature T and the internal energy U ofnf k250/wzrfz the water, in both the cup and the swimming pool.

  The internal energy of an ide,e ( (qbcuj7t1rrwncgu4 :1 qtal gas depends on

  An ideal gas at STP is first compresse *)v6s72f;c u7mjqnd qf4tbemd 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 7 ms;7vfjcqmb tfnq6de4)2u*U, the final internal energy of the gas will be

  An ideal gas with intergws/ t)2o4vqfnal energy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drastically ixog8pg7k t5h 4s that

  It is a well-known fact that watmg 9dap kc-80aer has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. Td- pg90amakc8he same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made ju;fy9y;x0y( ly xe)3v t/tmb 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 of copper. Which object experiences m y tvye /ybutylj03;(f; )x9xthe 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 liquid statx0q 6beca;;rg3tft 7re is referred to 3te bx6qtr; 7 ;rcfg0aas the

  The heat required to change a substance from + c2 v/k+ dzsrkrw4gby1h ui06the liquid to the vapor state is referred to as tdc6w2i1z+b 4gvkh k/ +0sur ryhe

  If heat is added to a pure substance at a stea 9+na: ;ouvlf 1zq0/hzyz7mbe ); 5pl slfs)qhdy rate,

  When a solid melts

  When a liquid freezes85x ) knr hn.w/*es7 frefl1pw

  When a liquid evaporas(s 8z: u*4:c*h;i) km0qx eociejak htes

  When a vapor condensbcm)d7k+6, 4lcrawkz :a a:qwes

  In a cloud formation, water vapor condenses into ywci. ( nq 6ighn iy8b5ia.-h8water droplets which get bigger and bigger until it rainsby .y88i -.hciiwhinn6(a5g q. This will cause the temperature of the air in the clouds to

  Turning up the flameqgavptc-7t((b :ex+y w)f +yez ua6j3 under a pan of boiling water causes

  Equal masses of watermbv 1 9c23cleld7di6m 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 5 e)tr dgoia4h/l6:r j*oj7kejq(y a8collisions is referred to aoi:7oq8tjj6h( arg rek4a)dyl/5e * js

  By what primary heat transfer mechanism does one end of an ir 3/q,wiif5lqc1a y3qfon bar become hot when ,fw/351 cfqalyiq3qithe other end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a pi(m5m f)u,kjoiece of wood. m,(kjm5 uo)fi This is due to the difference in which one of the following physical property?

  If you double the thickness of u k/jvmuft j;+vi.7ug0/ao6na wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the tu 6o+ /imuu./70v jgftjv;knahickness will

  A layer of insulating material with thermal conductivity K is plzsu,uvsob4 .h)by .h. aced on a layer of another materis. .vbhouys,ubh )z4 .al 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 moleculesox8 f;mhot7, v from one place to anoo;v fh7x o8m,tther is referred to as

  By what primary heat transfer mechanism is a pot of water heate4v cvp74coud mwr6..sd on a stove?

  Convection can occurzfx4t9p g 7/yl-u coojms-zk n.78 ea/

  Which of the following best explains why sweating is important to humans in mh*fe15 bdd+wtaintaining suitable body t1t5 *+dfwdhebemperature?

  A spaceship is drifting qi40* ifs4/cjymops9 in an environment where 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 convect4p*9i sqf/ 0jyomi4scion currents caused by this heating?

  Consider two neighboring rectangular houses built from th 7d7dm2 1ief ;mlw:yoze same materials. One of the houses has twice the length, width, and height of the other. Under identica1w7yd ;e o:ziml m27fdl 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 radiator is doubled, by what fact u;r;n2qt j/l(pm j hj ,fh-nol).cpu8or does the radiating pu, 2t(u f;lpplr-qn;o n.jj) mh/ hjc8ower change?

  The process whereby heat flows in the absence pbz/7ds jj9n:l96 vzfof any medium is referred to as

  By what primary heat h; d1m)wl soid, 9p9uctransfer mechanism does the Sun warm the Earth?

  1700 J of work is equiv (ra )ccyw-46qjl zg+salent to how much heat?

  16.5 kcal of heat is equivalent t* ojmgy ,6zk6oq 0v(nbo 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 temper1 pjboijc,)ujal 1o 4)ature 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 tempe-r/pta nbwp lfz10,y88ez zk6 rature wz/ a8t e6pn,1bzr ylfz0k- p8change?

  A 4.0-kg aluminum block is uit.d p+ee 5mc/5hjuwi; cp+b.h/df +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 9zu 1pll3szn avy;o 3;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 w t** 6 )nliygwlb(3qkadding 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 ira htu m1k4f- .gfrpoj8v 52u1mon and 0.16 kg of copper. How much heat is added to the gear if the temperaturhjm f1r2-au v8.5gpmukot1 f 4e 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 nlr7*za87 lgj;tnaa3ged 8 yr;ah5e ( 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 copper, 7(rhjai8q0 k e8t/qcc 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 hm c0,.,,ntcfdq *a*6 abg5stnq0awqat $100 \; ^{\circ}C$ 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 upehox+ k1 1bfx9 a system that is thermally isolated from its surroundings. One object has a+eb9o 1xf k1hxn 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 t9;xsvth8q 3iy k+d5ethe relationships between various forms of energy by meed3h v t8q9xk+;ytsi5 asuring 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 vertical drop of 20 m?

  The water flowing over Niagara Falls drops wjns xy6:gy 97+)rfhta distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rt+y)yws h:9frx gjn76ise?

  A 200-L electric water hewp tr t zi 6./pjautnx56/r11oater uses 2 kW. Assuming no heat loss, how long would it take to heat w/o r tzt 6jw61p5/.tiupxa1rnater in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long 62;po mcehh c)will it take to heat 20 kg of wate ;hc he2pmco)6r from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (y(r3 c 6 .mx3fkarb hvwd+a+0fmass 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 (specifmfg6qcp c0) t.ic 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 itmbv-9s6 ydha 3 xhuzg.ro25l8 to liquid?

  Ice has a latent heat of fusion of 80 kc4 tllh nr-ahc:.o2cn 2i b lqvt.)a.0cal/kg. How much heat is required to melt 200 g oqtc4t)2la:ah 2bl.n c- i0 .crlnho.vf ice?

  How much heat energy is needed to changt4 zw+lz7qb /yxt8h g7e 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs tof *u:sweo2pac :59nb uz3.o4f,z mlwq be removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80yjjh2u c+u1p2h o5jr/ 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 iua/sl ( : z-k0zhbv7jjdtfw, .nitially 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 aa*k tb fh2u(q2wq:/smt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg *np.m6u0uj:zl.q lriof water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gram ofrnca x1 3v;5- 5icbiry $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is requiy1m z f1tldiu5 (5uh-ored to change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice yqo6agupgd :fo; l- sj/56+cm 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/kg, and /,wh*2yfhk+i1 mw9m9aed xtk5qou h9the heat of vaporization is 207 kcal/kw9 dh9ai5m/*xmhekw o2 ,fqt1uyh +9kg, and its 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 concj9g ngbdq98o em :4p4erete 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 twice that s)eh6 eo5ntv 7ssd t141 8edlsof brass. Two rods (one aluminum and the other brass) are joits)ve87l ohs ss1dd16 enet45ned 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 dimensioe*c;( zgt7nd0kkdgy k 5mecn 995bjj+2nwj :jns of 3.0 m by 1.5 m. If the outside temperatur5ntjg 9( ckk29n*y:wn0 b+j5djjkmed7e ;gcze 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 dimensio4wj9:22 rzqjt;fki vv ns of 3.0 m by 1.5 m. If the outside temperatureqi2v49:jfr w;t j2kzv 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 udsm;pf5h/f9 m x 2.0 m section of concrete sf;59 /dupfhm ($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1,000,000 cal of heat tgjjxh,d *13pf hrough 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 tempe:im/(k6.qp)yk zq (ug qrl)pfrature 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 mon.kfvf0ph 3y7ao6:p diitored by measuring the radiant power emitkyhfa6.ofpip dv 7 3:0ted 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 rad ju4x 1sn6 of)i+7itipiating 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 coilfky8:sgyy 5m .) j7zllector (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.