Which of the followin-;pc h8c u8xxgg is the smallest unit of heat energy?

  The amount of heat necessary to raise the te(;l 1pk u19mjk.r,xgjqscg+b mperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic ewwss ,lpk )2d/nergy of individual molecules is referred to as,)ww 2skslp/ d

  A cup of water is scooped up from a swimming pool of water. Compare txl.ii19 * e((ziecgs(oaci k5he temperature T and the internal g9*ii s(.5xak zc ile(cie (1oenergy U of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends * lech6w6h;0ko4ri ruon

  An ideal gas at STP is first c5lda61 5swxk h-ancn9* jgob/6b eyh,ompressed 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 ia9o -5d1yae hclkx jwb*h/sg56 nbn6,nternal energy of the gas is U, the final internal energy of the gas will be

  An ideal gas with internal e8k;q-;a6 pf3s gqsd6fms+ fn xnergy 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 thatw 4s*i2iu4 qxmg+henhu8h p+-

  It is a well-known fact that water has a higkn: g)1/bjuk-bb4xyqher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount of heat, 30 calories, is adde-)bkx g1 /ykb4 j:unqbd to each. Which statement is true?

  A thermally isolated system is made up of a hot*ez u bz9j hw*rm0if(9 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 jz0h 9z9fi*(meu*wb r 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 solid to the liquid state is r:hjlbwn/(g e prpg7 :)eferre jwl:bnggpe:/r(7)phd to as the

  The heat required to change a substance from the liquid to the vapor state is gk( at4gqfr jgp,d e:a/3;j -orefed,j4:;qatg- jfpg e o(a k3/rgrred to as the

  If heat is added to a 1 t tmvh(pe)(a 2jloa:pure substance at a steady rate,

  When a solid melts

  When a liquid freeze7+ gf xn;r,1ua(aiklx s

  When a liquid evaporaz 0m*m6wfa c*nj zkq23tes

  When a vapor condens6asgf5s z6oe(es

  In a cloud formation, water vapor condenses into water droplets whichojh9hjuef7(;nc aq+l 7/c + fb get bigger and 7/ foblhqf u(;e9 7jc+nac hj+bigger until it rains. This will cause the temperature of the air in the clouds to

  Turning up the flame und 4(rou9li,qvr6ik8 cl er a pan of boiling water causes

  Equal masses of waterbiw /v wo+f62 r0-muru 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 fla 1d-3 wt t5pqgxcg+0 s:+ zdue9eyml9ows by means of molecular collisions is referred to as5dau3mx 0s 9egly+dt-9we:pz1t+c qg

  By what primary heat transfer mechanism4. z2g(llh m.efjfnl * does one end of an iron bar become hot whele*2l.jfgfmn.l( z h4n the other end is placed in a flame?

  On a cold day, a piece of metal feels ; ;njl72u n not0w:s..tw xkblmuch colder to the touch than a piece of wood. This is due to the .jtnsbl ukn20;7.tonw: w; xldifference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous material, t3dp1kieh2q yj -f 3le7a 2jpm2he rate of heat loss for a given temperat2jj3qiymp a kpeh-7d2e l1f23ure difference across the thickness will

  A layer of insulating material with thermal conductivity K is placed on a lut 7 cpwt0)yy-0krba 5ayer of anwbc 0u t )07t-yak5rypother 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 movement of molecules from one ) k+jmmds 8dci*k/8kp place to another is referred td8 +pjmsd)k* 8ckm /kio as

  By what primary heat transfer mechanism . u1s60qndyw: dyi fg9is a pot of water heated on a stove?

  Convection can occurs btp+za( dnts9-t j,omif)+.

  Which of the following best explains why sweating is important to humans i3i 6hij4dg5mun maintaining suitablju3d h gim5i46e body temperature?

  A spaceship is drifting in an environment where the acceleration of )(4fg/farw nuew34 gqgravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about the convection currentsfn(/w34eugg )aw qf 4r caused by this heating?

  Consider two neighbot eihw v3,(o-p,db pp8ring rectangular 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 the rate that heat would have to be supplied to maintain(v,wphd- p ibp,38oe t 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, 1yuy p mlc)7 mlx;4ez/by what factor does the raml c;/yu)x 4yplzm71 ediating power change?

  The process whereby heat flows in the a7+ajx 1hagh6ebsence of any medium is referred to as

  By what primary heat transfer mechrs)dx0/: :n vg av/f hiltzas-7ck48xanism does the Sun warm the Earth?

  1700 J of work is equivalez*iaq+97jxv6e5 /j rdtqsw+cnt to how much heat?

  16.5 kcal of heat is equiv ugyhm w-0u;d.alent 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 the teo ;8 *kdown1efmperature 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 006id5--c,i/ g c cplgr xigugkg of water, what is the resulting temperature change?ggglr5x/g-0 -pci0cu i i,6cd

  A 4.0-kg aluminum block is orxpozsc1c3+ vpq)r b *4s e9 dq,ta:vh(iginally 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 mac:lkr2rp),w 9 xf-oevx1spa g5 9o.daterial by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by add4xtq0/a+byis+xn k (m 9ay ua1ing 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 kr5f7p2)i-wl y 6skuhdg of iron and 0.16 kg of copper. How much heat is added to the gear if the thfd6r2 kpl-5)7swui yemperature 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 o 42qpw)cg u)r5lm-jf,q i f /he6*kwdmetal 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 attqs1kuf//qe+. s 6yv o $95 \; ^{\circ}C$, 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 aa g5 9mxl7nzw+t $100 \; ^{\circ}C$ 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 thermall0o9zxwws1 -i by isolated from its surroundings. One object has an initial temperature o0s 9xib-o z1wwf $100 \; ^{\circ}C$ 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 exp68 llrnr ifv0s .c hcr22ri.(olore the relationships between various forms of energy by measuring the rise of temperature of water vr. lrso0 fcic (8n 22h.6rlirwhich 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 Nfnk6)i xm 1n+3u.4u,xmy y ztgsrwp7.iagara Falls drops a distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the wateyz6pyi, n3u7.gxu1ts4 wkr +f.)m mnxr rise?

  A 200-L electric water heaterkim ; 1hq1pka2 uses 2 kW. Assuming no heat loss, how long would it take to heat water in thi1h 2 a;1pmqkkis tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it 6hnt+zlbv) 0 x+bse-rfz8uh+ 1an;i otake to heat 20 kg of watt)i b1;r-+b+n+hzfe x 0h lu6sov azn8er from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass dki,.drclj6 p79awa :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 (specific heat =iv.ps+ 2gg7te28i8 y 5yujknm $0.11 \; cal/g \cdot ^{\circ}C$), 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 tom* xku*ga gpr(c+ g8pjns4t++ liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much hen6x1b wt: d,oqat is required to melt 200 g o:xdq6wt n,1bo f ice?

  How much heat energy is needed to change 10: 9 6da5s(s frgx;rwblz 7epg7 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to5 a5h(x lguxwpx8k(k ;iby0 u* be removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of i( d,naqnpg-m/1n6 ,1fd x1bdw. fi isbce 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 initially at pa ubb9f t-)/h$100 \; ^{\circ}C$ 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 n c880xj2qlp6gcdd0an+ p g) x$0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to 1dmtv -yzr:)ichange 10 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to 5mi.jl j hn)av- w/bycya 14/kchange one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to changefu:/ bk pbfw-) 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 hot tea, ini rdi 44b5 fjasbw/+z2: c+o/geip cx3ktially 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/ub m+)(b furx3kg, and the heat of vaporization is 207 kcal/kg, and its melting p (rb+u3mfu bx)oint 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 concr gcf-v49fk1*o 8wq1b: gv wmxyete 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 thatv 9 wlz.guz685b(ih8h1vnvf /pb 7bce of brass. Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of vvz(nh 8g9ilz57f cbwbp uh .v/b681eequal 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 m7o;tu zpei9 dl. uy;9u)y) vro. If the outside tempervuy ;7tou e)lou;) .z99rpydiature 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 u38ii:tyr:te2 a9hv3i p,l dahas dimensions of 3.0 m by 1.5 m. If the outside theiautr:i239 dt8yap,v:i l3 emperature 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 conk/qcg xjp)pyni6vi;2g 14r.bcrete ;p gr .vgb4ycij1)q 2npi6/xk($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it take-uuazz ptu)3qy i9ap4f 86q )r*c v(vu to transfer 1,000,000 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 l uwo9,1 +4vkt+uktmcof 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 furna38nr l qyzf/6lce used for refining steel, the temperature is monitored by measurinrzqyn 3/l6f 8lg the radiant power emitted 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 it is at ..s t sq00vv;qs3zsz n$33 \; ^{\circ}C$? Take the body surface area to be $1.4 \; m^{2}$, and approximate the body as a blackbody.

  What temperature exists inside a solarjm8-+6xj97ogxi e plv 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.