Which of the following is the smallest uniaps6ps )evlcb3s3u )ve3+77 h vabmc )t of heat energy?

  The amount of heat necessar18kcluacu vku:a6b+ic* f(lii)3( ym vsb/8 py to raise the temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules 7hw21r boc:mf 9ovy 2uis referred to aswm oo7hbyrcu12 :2v9 f

  A cup of water is scooped up from a swimming pool of water. Compar7 nv7qtxd1kw n))uel, e the temperature T and 7,t 1 dlevqx7un)kw)n the internal energy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends onotdir4;iq(9qdfg5 ; - jjwx:l

  An ideal gas at STP is fir 0kw5p 1/bnrpfst compressed 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 h b pw1/n5pr0fkolding 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 energy8ph,d* + dvej:k0aqw a 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 is -yfi:/d- 5c4 pjbvrma that

  It is a well-known fact that water has a higher specific heat capacity than ironfy q2 g(24+fx(xqavaxc 2 d4ln. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is added to each. Whi alax4(qfqv 22fxcy xnd +g4(2ch statement is true?

  A thermally isolated system is made up of a hot piece of aluminu (lexc:ph :2wdm 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 o lpc w2ed::(xhf 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 chan75nt8 rja1kibge a substance from the solid to the liquid state is referred t r8a7nkj 5bt1io as the

  The heat required to cha7n z2w9olgz+cvy i;g(nge a substance from the liquid to the vapor state is refe+g lv7zo(wngc;z2y 9 irred to as the

  If heat is added to a pure substance at a steady rae::u+l+iul2+cw (ic c (u5lpan ziw.h te,

  When a solid melts

  When a liquid freezem8-fins2s2bg*j 2qywz3ls pelswy:/)1 i 0 ups

  When a liquid evaporates/ qkina5d1c).lpf vu7

  When a vapor condensesp fo/sg19bp qni:(s 289 fepdt

  In a cloud formation, 7mp ey)wpj ,4swater vapor condenses into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clo p)pmwes4,jy7uds to

  Turning up the flame under a pan of(f):b; xa ls u*8oqqoy boiling water causes

  Equal masses of water alo / bi4eeaz3c)yf) *hxck; t*t $20 \; ^{\circ}C$ 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 meantd5l*nq45r6l i 2a.fv k lh, *vfz,ffns of molecular collisions is referred to asll,a ftn52vf6.5fkni4q rl*z fvdh*,

  By what primary heat transfer mechanism does 1g gxmozn1y +8p3k8i6ax ,p lcone end of an iron bar become hot when the o oik 3g1,yxpx18+ clpaz nm68gther end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the a65i;unuw 5 qzu 14 x1uk9ukrctouch than a piece of wood. Thisi;56wcuuk xkuqr1u nz495a1u is due to the difference in which one of the following physical property?

  If you double the thickness of a wall built f;)f,w 40zqxp(iwdh hj rom a homogeneous material, the rate of heat loss for a given temperature difference across the thw0jd(pi,qzxwf 4) hh; ickness will

  A layer of insulating mxe( ij* un.coz 1r9v)xaterial with thermal conductivity K is placed on a layer ouexc9oi*) x1(zrnv. jf 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 byp/ 5lx- r.oj+co ;almx the mass movement of molecules from one place to j xpx+olm;. 5/a-lco ranother is referred to as

  By what primary heat transfer mechanism is a pot of water heated on a;t plm+kp(i.xr-a*fz stove?

  Convection can occuryz(7k-psm0 c m

  Which of the following best explains why sweatinu,tazz3 vlo 87g is important to humans in maintaining suitablaozl 7t3v 8,uze body temperature?

  A spaceship is drifting in an environment wherrk9*o bjc:vngn*,)s6-lig 6lx:jv h njb/g-ve the acceleration of gravity is essentially zer-* ojcvxbj r,ghl-/*)j:gvngk6nv:n il sb 96o. 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 heating?

  Consider two neighboring rectangular houses buis j,lq3f6x) qilt from the same materials. One of the houses has twice the lengthl q)x6f3q,ij s, 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 radiator is doubled, by what frp7v8qq;b * yractor does the radiating powe 8r*;ybqr q7vpr change?

  The process whereby heat ,x s,eys3my w-(zfg)k q v eg9r:e3/ecflows in the absence of any medium is referred to as

  By what primary heat rgv (+kugc6b -w7r5dwtransfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how much hdk2h;xowdj ks,v,kt. )*m* szeat?

  16.5 kcal of heat is equivalent to how much workqcdp 1eesn 31 f9mr . nr8wp4l97izj:s?

  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 temperature of 100 .thcmk24wyj6g 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 temperatu9fu5em i8-50 vwupowwre chan9ou0 -fm5 iwe5pw8vwuge?

  A 4.0-kg aluminum blocgyem t83)n az 8vol i c.x-w-fp6zp.:zk is 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 the temperature of 2.0 kg of mater x h ewosoa8w47+6)tsdg,g4g nial by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by adding 5.0 L of water* 7sfcd-f,7qjm1ht jj 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. How mupsy36dn,6vx lbj p9 .tch heat is added to the geasppb, 9 6nytdv.3xl6 jr 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 metaijkqhhzhu+skqm 20dei t0a1.yqrb (-c0a2 :(l 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, 2ztz,*k h rteew,py/z j c)j4,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 at z 11uflf6rg 5ev*-r sj$100 \; ^{\circ}C$ 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 3kgkyo tk7(sq og46 w9xkp00bisolated from its surroundings. One object has an in gp0o6k0xo4 kqk b k73gtys(w9itial 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 explq ,1;+npq1gkry 9a+fbu ruz8uore the relationships between various forms of energy by measuring the rise of temperature of water which had fallen down a watequk 1n1y;zb+rra 8 uu+9,fpqgrfall 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 d f i/rnc8f8bp ( +pto u-2tuvz/siah1.istance of 50 m. Assuming that all the gravitational energy is converts81(fbri-p/fn8.a2v /puc i htz+ot ued to thermal energy, by what temperature does the water rise?

  A 200-L electric wat.gsq7jqa ei2c t-2w-s, j6a nwer heater uses 2 kW. Assuming no heat loss, how long would it take to heat water s6nwatc2-qgw, j7- .2iaqjse in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heat gxc t*1- ,oois1v, fdq20 kg of water fro v d1xosiq*1-,ocf, tgm $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mp u 5o3;5 bzswbldk7;oass 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 k9(ajp t.gv ad*nife 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 fl/pjczq5j -wh 2pu,mt; cs8.arom steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much he4v w7okh lpocr3rs 1p6d ;fv3.at is required to melt 200 g oop6vr3r714sklpd;.c ho 3fvw f ice?

  How much heat energy is ne9i:f3 nbqp *-tao 8 ofzvp9l;teded to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be remov;brp(qhs) 6(v)/tix s ccr 67ywh lsn8ed 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 a18uid- m 7wkict $0 \; ^{\circ}C$ is added to 50 g of water at $25 \; ^{\circ}C$, what is the final temperature?

  Eight grams of water ini rw:8gfj4j8ym tially 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 h6l771w8mjj qwady t- $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is neh zg q/9+wn yh vrtap381fc2-seded to change 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to changewq5 bskgs 15w8/qx 3eg one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is reqnw( )bsde d l6phy0lrai7vs5)-f20fb uired to change 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 hot2:8tg 4-y y;rom pjes tj4g*yk 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, an ;h-o 7ft;qjgpv.w pnipw5r::d the heat of vaporization is 207 kcal/kg -q.; n pvp: whjw5poif:g7rt;, 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 ofz6lkkm r hg* 7dgytnq6/964pieq :hv + 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 of brass. Two rods dio:4zm8 9j2gckh:j e +i)rm x(one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of eqk:2 x :rjjgdm)9h4iemz+c8i oual 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-ek zog7wyp 1*sss* h33cm thick has dimensions of 3.0 m by 1.5 m. If the outside temperk sso3*psg7y*whz13e ature 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 dimension2d dgewqewkk;bx;2 k8- r3n4ts of 3.0 m by 1.5 m. If the outside temperatudqe24;;3wgb 8nk edx2kk wtr -re 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/t4dfu*8-0ud mhd u dhrn2ijj:*gi 5s.0 m section of concrete 5d0jr*2u8/ujnh ddfmi4sg*-ht:d ui($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 1,0dn iutg sf06)tl+vlz 0.z /+ia00,000 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 temperature if 4000 kcal of he7kf)3l q 1/bi u;ubknqat 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, tp,6 tq5zgks w9he temperature is monitored by measuring the radiant power emitted zsg956t,k wqp 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 radiating energy when it56arthymu0q- 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 of8t b wv41rm1w lixeg*9t0x* 7h7yjijr $15 \; m^{2}$) 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.