Which of the following is the smallef:y7fkle,z yrw,u k9dmr 0a r4*9d: omst unit of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of watagk*+ +8 x7ch.qnec j7 bzczy2er by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules is rezuj r*g7x-y 9gg8qv)t ferred toj7u tgxr89 y g*gqv-)z as

  A cup of water is scooped up g3l/ eiv)vib)f.6v1y;b,x1sgkt m vmfrom a swimming pool of water. Compare the temperature T and the internal energy U ;bi. 316m vfgylv s, tim/vx1kevg))b of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends on71n+;v6bnalv - aexj e

  An ideal gas at STP is first compressed until its volume is half the i io9)y p,ad yy at1iza,;:(keknitial 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: 9y yao;( ap ),1ikd,aetizyk final internal energy of the gas will be

  An ideal gas with internal energy U3xvb xd5d9bi k 0;al.c at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean tempera 7k ku*2lqzr2n km0sf1tures do not vary drastically is that

  It is a well-known fact that water has a highhzxta29 /yp-qmmb. h,-kgt- 7r s cxf7er specific heat capacity than iron. Now, consider equal masses of water and iron that are im-,h-f p . 7 x2bzc/krxyathqg -stm97nitially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system i19-:tsxtm +kvx sj t+as made 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 the greater magnitud+91jsa tkvx s+:xt tm-e 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 ta9xxce ru8lv/)y 3uh* egf,,xri t/ /ao the liquid state is referr,aa ig/v efx8yxxu )/,t*ulr3rc/ he9ed to as the

  The heat required to lp4o)z3:n4f oez a.zqka0 y3q change a substance from the liquid to the vapor state is referred to as thfoz.4ok ez3qnq) ylz:4pa03a e

  If heat is added to a pure substance asro ow) 2ethr/3kf*v2t a steady rate,

  When a solid melts

  When a liquid freezes55gx 8i w980bpxgb idu

  When a liquid evaporates,8tkq1cg:;cw l7em8o1 jmg ip

  When a vapor condensesrf4 6kkpj22ztr( ,mu(j k-pgy

  In a cloud formation, water vapor condenses into water dropl sskf+.kxm3 .w 3x92ynr4oqqrets which get bigger and bigger until it rains. This will cause th 3mq+qr.oswkx r3ksxny24.9fe temperature of the air in the clouds to

  Turning up the flame under a pan57 lwhy4ul gy80k/vt v of boiling water causes

  Equal masses of water at cohf4 hrg/6 c1*n1zjurypm8 *$20 \; ^{\circ}C$ 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 re g;p2it3vpv amg/l-l/ ferred to a3pv/tpalvl/-mi g2;g s

  By what primary heat transfer mechanism does one end of an iron bar becom7uqn+, )xchbxe.h*+f gn.xddzr (yn 5 e hot when the other end is place*7fg+b5u,yde h.)x qxzchr.n+ (ndnxd in a flame?

  On a cold day, a piece of m) 1e7o k1mgjt88qw9:i bithjfetal feels much colder to the touch than a piece of wood. This isbe hwt9tmoi1i:88q g)kj1j7f due to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homoh, x/6e 8z(nlh9 :ds etqjzwh:geneous material, the rate of heat loss for a given temperature difference across the thickne qhs/e8wh(h d96zn:,lxjz t e:ss will

  A layer of insulating material with ther jf )8esdy2sj;fq2, nxh1 yrp3mal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal 1 ;f3r28q2p d hysx)jej,sy fnthickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of cudk0/nibu3bh.8+ct molecules from one place to another isn3+duc8 cbhuki0 bt/. referred to as

  By what primary heat traov)wcwu(6b n0i 4mk.dnsfer mechanism is a pot of water heated on a stove?

  Convection can occurea4y0.)4fs t:ziudt h

  Which of the following best expl/5bx*;60 ik4x ncytndte y8q lains why sweating is important to humans in main i4d; xe*8t y0ynn6t/xb kc5lqtaining suitable body temperature?

  A spaceship is driftingmu+ .l l:)l w rxxw-zt6.kt;q ac5rpw8 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 convection currents causedk : 6xrxcu w qtlpw.).la;l w+m85rt-z by this heating?

  Consider two neighboring rect :;wov3+*b gkeixh( kwangular houses built from the same materials. One of the houses has twice the length, width, and height of the other. Under identical climatic ( 3 ;xwb:+gkiwo*ekvhconditions, 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 tempedwycp/pz 9*j ,oh,9qerature of a radiator is doubled, by what factor does the radiatingc 9hez* w ,py/pqo,dj9 power change?

  The process whereby heat flows in the absence of any medium is refem ,ahqqxh*e c7- .s-bdrred to as

  By what primary heat transfe,o(izkc2:kgcsnng;r fu 45 *tr mechanism does the Sun warm the Earth?

  1700 J of work is equivalent twx .nl3xjqz t9xg3 9x4o how much heat?

  16.5 kcal of heat is equivalent tok/esqb e7 hnf+g6klj tl),07e 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 303u8 tzwqelmpq)w/jg( do.g to 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, what is the resulting tempgxv *aqt9xu +;erature chanutqgx; vxa 9*+ge?

  A 4.0-kg aluminum block is oriub p* vwf, xk/f4)wlmv2joa+*ginally 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 temperature of 2.0 kg of (sv vpe/t kxy/ i;ei/.material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by adding ak2wci s)h+*995ghv p+uhpme5.0 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(6hhzd9b7 rod ow much heat is added to tdrhb6 9o( z7hdhe 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 m *:2st sk1cw(7buk8lkrikc 1zetal 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, inidd+usl2 gv58 pn+8zdstially 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 at iq7 bh z)7d19 pstpox.$100 \; ^{\circ}C$ 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 isol jp a9na6u2fa gzb(6 yuc+pb+v/;oxtzq kr005ated from its surroundings. c zr5zbb x/a9 ypgjn pot+a+06f2uqv6ua0(;k One 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 exp , f1re4 ,z3-xowiuk)wcqyrd 9lore the relationships 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 expect for a waterfall with a verticaw3,9ur1r cq4,ey-x fwokiz) d l drop of 20 m?

  The water flowing over Niagara Falls dropo:9p.t on j +gjx5u6pis a distance of 50 m. Assuming that all the gravitational energy is conve9+ 6xogj tp.ui:o5np jrted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, h)s h2lpd;uv*8x/hj pp r k y17lfc(h9eow long would it take to he)j kux21h7evrd pp8l9(l* ;f shp c/yhat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is usek v+b(fhnv,iqem7e+ /d to heat water. How long will it take to heat 20 kg of water from +v+ nqf/k( e7b,hie mv$20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1 s1 : hpkfiimf+04.ovc000 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 ( /e jdip42vw(r9it ,unspecific 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 it to liqui*cbwk vey7z49d?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required to meljj.eoff,f y70h bdh mp8c:i4-t 200 o.fje8h j4f,m: -cfyid07 pbhg of ice?

  How much heat energy is needed to chang9wp rn*e+p bz60 7hwkze 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed fr p/3)w4 sad zy/r.)u0uujbmq eom 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of iv)nyt f y1ol40ce is 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 initiall t6bfxdll;+d ln33 o/ty 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 at i phafmb.u((6$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed t4)1lgeb9 dkn6* y9:ugbt x(rkf-n kc ro change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change bl-kt48 p5 ,j)dq+* mwwtyohoone gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g p+9,cuocnx c6 of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg of hot tkquk)kigof/ nc:p *.2ea, 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 vaporcebz.0 p.e6 r2)g xtkwization is 207 kcal/kg.x6.wtz e0b)2rcg epk , 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 concrej f/*)wdxc4d wte 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 njv :. dl-lef-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 rods are of equal lengths and radii. The free ennjd-f: vl- el.d 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 zf/i88ebv4 ya aut ,e+outside temz y/,b4ia8tee8+f uavperature 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. I ikh6mp-k0g.e f the outside te kipem6h g-0.kmperature 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 co 5*tlr/fl/tyzw kfz .avn35r:o,k1m vncrete oy*1f nr zw.3/,5/rlm t5 t:alvvzfkk($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 througheojo86ad wx fi+ ;q+g1 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 thro8d52 hv,qh4f ; eja bd-1mlbniugh 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, t :qge h up6 fmawdy;b5dom4o/t:a6m9-n4yr . bhe temperature is monitored by measuring the radiant power emitted through a small hole of area ;6pm644d n ebbg5-awmry q h:/oyumd. 9at :fo$0.5 \; cm^{2}$. 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 en:j mwysh,psd (;0s 0msergy 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 collectixbz4e/w 4/ -kao6fnqq on 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.