Which of the following is the smallest undlapi* 2rta nav-b 7:5it of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram ofo0xai 6hq)fq;a24vc t water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic eza2xf:g u51f vkwd9/b nergy of individual molecules is referred to asb5gak1w fd :v/ux2 f9z

  A cup of water is scooped up from a swimming pool of water. Compare the t,oi djej 24vaff+c64b emperature T and the internal energy U of the water, in boj4fd ioa4fbcv+e6, j 2th the cup and the swimming pool.

  The internal energy of an ideal gas depe9a8guoe1)rxy*l(sp x nds on

  An ideal gas at STP is first compressed until its onhc5kcc)od;(/ 4 y qcvolume is half the initial volume, and then it is allowed to expand until its pressure is half the initial p(d/hccqc4kyco;) n 5o ressure. 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 Uhfpty0 b6v 4l/8f 5ncn at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drastical mm 5a5v+ypua ir ;og)u3a3 b.xen.h:xly is that

  It is a well-known fact that water has a higher specific heat capacity than iroxzb0d+ lzqh8zig q /id e4:)p6n. Now, consider equal masses of water and iron thz) z+8lg:b ex6hi dq40p /dzqiat are initially in thermal 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 ae q)5g4xg*tt t9:r, yo 9txs,cr oe6uzluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The speciftozrsyut4gqc,orx x9 t6t9*e,g )5:eic 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 su 3 ;wnnah3f(nj opw2af,p39uk9 a8bdolid to the liquid state is referred to as fuhab n a3u32jna9kwo8 f d,;9(p wp3nthe

  The heat required to change a substance from the *mo9- wyf.yc7p 3eua5tj8n* g sk n8valiquid to the vapor state is referred 5om.g* 8cvanf738 nt-p 9uyajeyk ws*to as the

  If heat is added to a pure substance apba0*ch jcrqa9y4u z .a0m )*at a steady rate,

  When a solid melts

  When a liquid freezer1wzkgg 9798 ung wxl c:w7;zps

  When a liquid evaporat7d jxpff:w 6bvog6uvt8yd 941es

  When a vapor condense)d7 ag dunxpvqe3z(9s-) h(fus

  In a cloud formation, water vapor condenses itw x1 x5xf d;jfb6/6) wwe+tfunto water droplets which get bigger and bigger until it rains. This will cause the temperature1e 6f+b6xu; fwd xwt5/wjt x)f of the air in the clouds to

  Turning up the flame undermcgywx +vx 4ao/1c5f 4y)q- ap a pan of boiling water causes

  Equal masses of water 0 4*e+ ufl yd aty9wxypr4.+jzat $20 \; ^{\circ}C$ 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 r o1 mizh+o7q; fr0w,jueferred to arh oo1 w;uq7jmfz 0i+,s

  By what primary heat transfer mechanism does oosa39kc 7o t47ryon fh/its91ne end of an iron bar become hot when then4a7 17hci/rsst o 9yft9k3 oo other end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the4ekp-c9 d;0 gydvq:pswo ak*9 touch than a piece of wood. This is dueoydd 4p0kap;9w9gk s: -c*vqe to the difference in which one of the following physical property?

  If you double the thickness of a wall built from agte mxz( z*f/5pqy(;ehjj7)p homogeneous material, the rate of heat loss for a giz*x(5phj;) jfzte/(e7mq py gven temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed on a layerh* zl1 ss8l4 8ia66b pqq6yr0slxbl v5 of another material of thermal conductivity 2K. The layers have equal thickness. What is the effecl8s85q0b6q 4 *ssxb6a6 p yllrzv1hiltive thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecules from one zki:uoc;e a.wo,id/ ( place u/ko:o;waizc (d i, .eto another is referred to as

  By what primary heat transfer mechanism xf7yx )(,x8+hs tqec iis a pot of water heated on a stove?

  Convection can occur4wuibt ;*ymm q6m9n : vm-si6p:,xboo

  Which of the following best explains why sweati/gc;uz )8pmim01 cdsjng is important to humans in maintainz8cd)gim1cmj; /spu 0ing suitable body temperature?

  A spaceship is drifting in askm i5*vg*k 7z0qyf 6yn 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 ti7mzfy6 5vyqg 0k sk**rue about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materials. Omqtsu)u u u3x.,n k6vt(i76r -wuf ee*ne of the houses ha) refkw qt uuui m*6,7st6ve.un (3xu-s 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 larger house would need heat supplied at

  If the absolute temperature of a radiatorz9b y;37fskbf.x vhz. is doubled, by what factor does the radihx;.fzk9 7sy.bv3 bfzating power change?

  The process whereby heat flows in the5nztpan06lb .dha8x m 3)-a7gcs3 pbb absence of any medium is referred to as

  By what primary heat transfer me5;xdrwf k )d a*,qn5kkchanism does the Sun warm the Earth?

  1700 J of work is equivalent to /f1oa 8i vczn;how much heat?

  16.5 kcal of heat is equivalent to how much work la7h u x)fms-5aor5e)3leth) gy7aev4x (/yx?

  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 tempetqhuin9n6 x b:8l6p 0erature 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 temperatnm (3xqw+; rps+j hz.ug w/yi)urzg m.wip;nwyu s(r)/j qh++3xe change?

  A 4.0-kg aluminum block is originallyfdll;npo; 4j8l(f fw gq 1x;1v 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 temperaturee9 qs5sgji)( fp rnpu16dg),g 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 by0socn q 2)cvz(dk x:zj3;p0xdrz 4r e, 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. 9n c yjvd:zh/dliq) uq-6wb6 kg of copper. How much heat is6z ) y uv6qd.j lcbi-9n:/hwdq added to the 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 mekx1q, kt3vw,e+t v2 sstal 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 copper, initially at 4;2dnj/3m-; ecve r3jg olcyc$95 \; ^{\circ}C$, 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 atwag4e7i-*e 3 crkp 2tpt:d/zd $100 \; ^{\circ}C$ 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 fr69 gkn1zpz aed4edg3 (om its surroundings. One object hase e1 pkndd64z9z(ga3g 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 relationships between varbe2p* h/: wxx qz8-rmuious 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 ex8:*rwmzqbe pxx/ 2 h-upect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a disid d88panl 1cm y,j0z;tance of 50 m. Assuming that all the gravitational energy is convd 8j1,c a nil80zdymp;erted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater x mxyr(b8 r74i). wutfuses 2 kW. Assuming no heat loss, how long would it take to he)8r4 wix fxuy(m7tb.rat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will 6kercbt7/: toit take to heat 20 kg of wateo7t6 bc/rk :ter from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1zqz v8 f75f*s w2hp-wx000 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 (specific heat =7j1 79r 01fhnqxj f0 8m(rpaaj 3d c6hier5bkj $0.11 \; cal/g \cdot ^{\circ}C$), 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 stety pugx(* p+c/r3w+x cam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How 1yv79 os6 gayaxs p0 pq+tg97vmuch heat is required to melt 200 g of9p670a yvqaxg7go1tp9vsys + ice?

  How much heat energy is needed to change 10 kg of ice a6m)f iyhn : zyju f(e9uk0ol.9t $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100 g ofle80k l; muiw03 ls -r(4lqmsj $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice i(r-gsce0 9 ue4csn7 x f umshr/j.-7bos 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 initially at .dem2 tlto+sme 9vm+g0ldnkx r:28 7f$100 \; ^{\circ}C$ 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 ata h7,ho -xmjf, $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of wd 4p7*hczc z*vo7l)nfater at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to,dcz*m+du* mf u 57rar change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to csai(1 mt, lh2eo,wleo9 j nk7,hange 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by addiye0/mrw5n.c o kkg 32hng 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 lead is 5.9 kcal/kg, and the heat of vaporization itjn z/0 tjd-0is 207 kcal/kg, and its m0-djttj 0/i nzelting 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 concrete nk-kwd hwltfn 9: (vt/s-eo,: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 thn3kmovi;b(p2ssv x3o-jf 4 2 zat of brass. Two rods (one aluminum and the othevnjsp; ( z om fi324ks-23oxbvr 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 outoc/e8y50 h.udkz ei v8side tv8o8 y e khci0ude.5/zemperature 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 q9e4zchkc: yqh3*d:h thick has dimensions of 3.0 m by 1.5 m. If the outside tempe3d:qhhzcy *:qe49 k hcrature 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 of concr*4r2em1 vc/,yx qunycete (y4n,/c1uey2vq x rm*c$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 o+acis.9rtis0 y9:l* ns w)iz*a 0kw cof 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 heatac.4an50js+ /,n u-oh lesu vq 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 temperat6 rff(i9pk8 giure is monitored by measuring the radiant power emitted thro9 i 8p6rfgki(fugh 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 humanq 1js.+4z bt, 8rllbtgjxh9/ h 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 exisfs nlpc(9m:t,xvd d*6 ts inside a solar collector (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.