Which of the following is the smgm yt v6+*jojjii8jh78, sb/nut5pt, allest unit of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of water b) p byv0julx:det t,14y $1 \; ^{\circ}C$ is referred to as the

  The measure of the averj)m2qeu8s l2 uage kinetic energy of individual molecules is referred to el s8uqm2 j2)uas

  A cup of water is scooped up from a swimming pool of water. of3b ftdn6 ;f9: p uzm*8;ypqh Compare the temperature T and the inter;93pt*8f;m:o pndhbz u6qf fynal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an idea - 6dgou*po)dcl gas depends on

  An ideal gas at STP is first compressed until its volume is half th g/0(mcd nygqv,sg68a), q0fp fcz7 rte initial volume, and then it is allowed to expand until its ptc76qgp0dz, fv/m ans(0g ) ,qg cyrf8ressure 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 en mm,3jc 05ysyp2g( gogergy 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 iuf/hryt10 q);* w 9oyo4ovzfy s that

  It is a well-known fact that water has a higher specific hea t1) w8(z cmpyajh1em7t capacity than iron. Now, consider equal masses of w)1yhwt(1 em z8a7p cjmater and iron that 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 alumi 0dl6yosjiv;n 1q.pt a-1m (gunum 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 magnitude a0m(y qp1js.u;6ni v-l1dtgo 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 state is(nn8mvn r0-r.n qt oih wq-k7/ refekq/rhw8 qn7irv .on- 0m(t- nnrred to as the

  The heat required to change a substanceu;22q6ygzr wbu ax l,/ from the liquid to the vapor state is referred to as qr/ ,by 2u6 ;zlwagux2the

  If heat is added to a pure substhxu d ib o+a :auvmi-n;+m6( :/i9 el9tlk,vosance at a steady rate,

  When a solid melts

  When a liquid freeze( p;0quz dwq-t2 b7xams

  When a liquid evapora: -c)) wq0d7e :dk7rg sizgwngtes

  When a vapor condenshvn0t;ak-zrnih:d .8 es

  In a cloud formation, water vapor condenses into water droplets whicau ) )v +/hed1- tksxeru.lkr8h get bigger and bigger until it rains. This will )u1eeradk8hx-+t kru /) l.svcause the temperature of the air in the clouds to

  Turning up the flame under a pan oqlbd2 l*r1el(t yd4 z)f boiling water causes

  Equal masses of water atg-9 vlzq-aoecs,g, a 8kat:y; $20 \; ^{\circ}C$ 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 refep/j7e s)zd8kd6p(u bo rred to as o8pub djde spz6)7/(k

  By what primary heat transfer m gua7v5v/mmf; xy*kosw9m ) x9echanism does one end of an iron bar become hot when t wv x9kv7gx5 9som* )ym;um/fahe other end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch khq osw/ -78n nl1x*lxthan a piece of wood. This is due to the difference in which one of the following pnoknx/-*hqwl8s71x l hysical property?

  If you double the thickness of a wall buihd-w3m:j) e6thhfci2;9hk tx lt from a homogeneous material, the rate of heat loss for a given temperature difference across the thickj 93 )ic;khwf2te6hd x: t-mhhness will

  A layer of insulating material with thermal conductiv s o, n;ynio-r:+zrr5:v1z dryity K is placed on a layer ofvzd,z:r n:r;is1y r y+roo-n 5 another 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 move/rwtb cbjd68gvc4o(vud 8 yt/ 0yl(n3 ment of molecules from one place to yldgjv y6oct4(v/ db/w0u3( 8c8nrtbanother is referred to as

  By what primary heat transfer mechanism is a pot of water 8i2;zh 3 p7je0 mtwzzkzyllnx6 )wr 53heated on a stove?

  Convection can occurm1e5z wanfk 9/

  Which of the following best explains why sweating is i dtau*;f43 yypr ht*.zmportant to humans in maintaining s *fz.y3ury4t*adhpt ;uitable body temperature?

  A spaceship is drifting in an environment where the acceleration5 lb44vft*ktjdxbn9( 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 caused by this hebn jtx*ftl54(v 4kd 9bating?

  Consider two neighboring re; q 00dmulnu-vg rnsu2z-*,b*r7frxzctangular houses built from the same materials. One of the houses has twice the length, width, and height of the other. Under identical climatic conditions, what would be true about-q fd-uvsu;02n* zr0zb,mgl7r*n xu r 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 r,frwocv wz ,d2nc3d3:adiator is doubled, by what factor does the radiating power wrf,23dz,3 dc w:vnocchange?

  The process whereby heat flows in the absence of any medium is re64,hkzi:o iu1: 2l 6z vr *,j.pdhy0 qrdzogfiferred to as

  By what primary heat transfer mechanism does the Sun warm the Ehm 4trey4tvo;.dx+7uarth?

  1700 J of work is equivalez5/js5 vuhae2 nt to how much heat?

  16.5 kcal of heat is equivale (po /p3fp+-u 5kjdyyant 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 r/ s-m4jfa ua0 7v6vanthe 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 rese:a13to q yxz4b;in *tulting temperature ceo43zb yiqn tt* :a1x;hange?

  A 4.0-kg aluminum block is originally at avl3 g,b8 kuzy3xq6u ,e (k.epi2g ;rz$10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises the temp/zjwac .,5btmcs np, 9erature 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 addiiy*mh8oi3s/ o dzgg72 ng 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 an2hy *ntp6 lfi*d 0.16 kg of copper. How much heat is a2*tif * lhp6nydded 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 metal is *i8qazz,kny0w: w r7 xlj9e:8wt2c lwheated 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, o-*10wzisr b- bg6 jztinitially 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 ,qmeo3m z.0ge t()aom$100 \; ^{\circ}C$ 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 isolat :hwtz6)reoe17m9oa yed from its surroundings. One object has an iowe: 6ya791r m)t hzeonitial 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 attemp / +vdmd(fd6c8vmkexddq)7 (wted to explore 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 vertical drop of 20 (7kvd( evmd+)xf/ 6cwd8dqmd m?

  The water flowing over Niagara Falls drops a distance ofdwd 5d;clt:fy, v ;opz8em1+ v 50 m. Assuming that all the gravitationalvdv;mow5 y f+e8: cd p;l1dtz, energy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how long wo4+g0wcfgi - he8am zv9uld itc4gea8igzmhfwv +9 0- take to heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long wjq6sf:mytn x0sdkra9(,* (k o ill it take to heat 20 kg of water fromjsk x,a0 s*yn( o d(fk6rtm:q9 $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (maso-gvn- nt -j*ws 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.ju9:+om r)i hcrz6 tc blade (specific 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 +m-kv +hf 8shejqox 7fp :*vb2it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heata;llu2 a w4o(g is required to melt 200 g of ic lao4g2lua(w; e?

  How much heat energy il6scf8je ,gao /tr5+m s needed to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100 g oqnke-/cy7 c)c f v:ogc:p63kff $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. When 50 g of icuwzzmnr 0qx(;- hii; ;e at $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water mumc337h,orjm0 l t:m *szmi3 initially 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 m i fpb5wk :o.6ba7v7c$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to chr1lu) x)66- yqjuub lsange 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gram o rm,p84/9q6bsl9a3 +q)v aaoyo as +pf q*verxf $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 2;rjg6a5 2pqd(bksj s100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg o odmmom+e .; 6j.tpr cbox2)rnl(,do)f 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 vay9qk;a i,fok 57gbch* porization is 207 kcal/kg,haiqfcb 5ky*97g ,o;k 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, - s:v5 bj,9icki to)ugm5hxd 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 conductivity of aluminum is twice that o zfr2k i.93ebnd5,ad f(vl( jsf 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 end of the brass rod is maij2 53 9kdfz,esfn b.((ra dlvintained 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 bymd*,bb2 kzb*q 1.5 m. If the outside temperature is b2 ,b z*kqdbm*$-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cm thick.e imb4w;7/qk97oohg/u f o ps has dimensions of 3.0 m by 1.5 m. If the outside tempk9 es .om;74/ 7bh/igq pwuofoerature 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 ofm r)b/mfl:k;oxeyp+0 sv) 8 mn concrete pmf:nveo/;y)kxl b8r)smm 0+ ($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 ca*foigi 3o 02i7qyhhc 7l 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 4000ma 1g09:oq hc)on:i hl 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 monitored byew;g8eodvs1 ya3g*-t measuring the radiant power emitted throug-v8 gt 3;e1ed *woygash 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 radikh53v4ik;rtnxd 4wch*0 s ux t5a1 6inating 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 o-d ifp(d;p7 zl5x xhjt6n0df ;f $15 \; m^{2}$) 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.