Which of the following is the smalled/w xq +z/q.t-r7k b euc+zyp/st unit of heat energy?

  The amount of heat necessary to raise ta.9:sdv ua8 q-y:yhvvhe 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 isx2lc)t ly .3eorqk ry/my6zte(j.90t referred toyrk r /lxteztqcm02y)3 y(. oe6j9tl . as

  A cup of water is scooped up from a swimming pool of wj;3cv03cf:kqpx g6d aater. Compare the temperature T and the internal energy U :a3qfv6p;kxcd3c j0gof the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas dea3fms)wama 7d:(i8 )q)iv jtupends on

  An ideal gas at STP is first compressed until its volume is half the bh 0wiedw zg-xe3il:2 ,pl73u b**piw initial volu,xp*ew *3uiibw w7 p dig-0e l:32bhzlme, 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 final internal energy of the gas will be

  An ideal gas with internal energy U at0 3l.yel3oks l 0jx5u,g rf *si+x .hykhod2v, $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not v pvsd2hh2pg0q c- ghu.4mt9 x*ary drastically is that

  It is a well-known fact that water has a higher specific heat capacity than*r1:r3ptig;4 k .1/uqmbaz f xa)jset iron. Now, consider equal massessm 11ta3k;)r ie af/4*qruz j.bpgtx: of water 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 uysn6tjf 2wun6 qy8 ng m))u93lp of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper amsy 6 69q23lwt 8gu))ujyfnnn re in thermal contact. The specific 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 solid to thegxw*gc -ts-p 1xp5li +f;- jkh liquid state is reh- + *;-xg5 pk- spcwlf1jitxgferred to as the

  The heat required to change a substance from the liquid to thl//jy+ (g lilne vapor state is referred to j(lyig/ ln+l/ as the

  If heat is added to a pure sunge 5v gnrxe8:g:sz 08bstance at a steady rate,

  When a solid melts

  When a liquid freezeeqy1o(sp eow g :s6zn 4)6b+bss

  When a liquid evaporatesnjz)*s*7 mx+m9oopw d

  When a vapor condens 7sh8nvf(v zpb m ,u-t*mo),nwes

  In a cloud formation, water vapor condenses into water droplets whi(*m2b3l7 rzkjvvbba7 ch get bigger and bigger until it rains. This will cause tk2m3lr7v 7b*zbjba v (he temperature of the air in the clouds to

  Turning up the flame(07 4 pyppy7hlr9p qi5q,f s4m-vthbv under a pan of boiling water causes

  Equal masses of waterrf;od 1 qgs9k- 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 flows by mea,4blo qom 4 c)jvwx8b:ns of molecular collisions is referred to a,mo woj vc)4 l48bbq:xs

  By what primary heat transfer mechanism does one end of an iron bar bev .sm50 by1tahcome hot when the other end is placed inbymhs a.t0 15v a flame?

  On a cold day, a piece of metal feels much ey1 m4up +dbb,ty/3khcolder to the touch than a piece of wood. This is due to the difference in which one of the following phy kp 43h/b+tyy,emub 1dsical property?

  If you double the thickness of a wall built from a homgeo-/- te l2gmke,axde+-g g 7ogeneous material, the rate of heat loss for a given temperature difference across the xk gtg ml/oege+e7e,- -g2d-a thickness will

  A layer of insulating material with thermal conductivity K is placedvf+rd/z( / haf on a layer of another material of thermal conductivity +fzvhaf//(dr2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass mov3 a+zh6,mr evq xtkk5-ement of molecules from one place to another is referr q,kzx53-hmkr t6ve a+ed to as

  By what primary heat transfer mechanism is a pot of 1oo,68;m4 4ogmropev be m+b twater heated on a stove?

  Convection can occurep f0y;to17 yq

  Which of the following best explains why sweating is important to humans in map:nh ::a*yp5c.udw.gtht 7z zintaining suitable body tem:z:dwt.n5c :y .g7ph u* pthzaperature?

  A spaceship is drifting in an environment where the acceleration zbcx)lje)23s n40 grg6vk3 is of gravity is essentially zero. As the air on one side of the cabin is heated by an electric 4ib r vns63s2kgz x g03lce)j)heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses bu lqih)/q9y(w vilt from the same materials. One of the houses has twice the length, widthlv(h)/yqqw9i , 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 ar2l1(lx gx 6 (fey7cui radiator is doubled, by what factor does the radiating power change(x2i 7gly6(lf1rue xc ?

  The process whereby heat flows kh no962. aglein the absence of any medium is referred to as

  By what primary heat t nv ;4con6zsl:ransfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent t0 rt2 .*iyj3s o7sfsehn3os fx;8;e imrd2(cko how much heat?

  16.5 kcal of heat is equivalent to hop49 8lp, q,y ie)pulh,tvoa 6zw 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 needq rm75r6q3ey;a0*/jj vgsy/yjq5k bu ed 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, h obd0b : 27*2a4etr8cd1ni1nykk hxw what is the resulting temperature c2n*7nxybo 1dae:itd2wkrh 4b1 kh80change?

  A 4.0-kg aluminum block is originally atwi;y4) 8upppd $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises thh)j5v u5z 6cswe temperature 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 addingtx4kq, wj87g1n 3jbm a 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 kg of copper. pd:e zf1k74 d 8bxlmy b2k.a6fHow much heat is added to the gear if the temperature increases by lmf 6z kdb .df1a28pkb74e:xy $35 \; ^{\circ}C$?

  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 heated sho mlc0uh9v89mw : 4ito $100 \; ^{\circ}C$ 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, wg29)ee3pek p 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 atyhx71*d8ks psmvf v;;7lca s 9 $100 \; ^{\circ}C$ 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 i3nfz u43y;i u4m hg9z/kx ,r pjkzw5+osolated from its surroundings. One object has an initial temperature oxifk34nzhr4pju m+k y3,g/wzu5;z 9of $100 \; ^{\circ}C$ 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 yb(jq8bk r ps 1*,zxe)between various forms of energy by measuring the rise of temperature of water which had fallen doszk1 )e x*,pr8y(jqbbwn 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 Niagara Falls drops a distance of 50 m. Assuming ts.e5 v m98v 6rrtl8o,c vcz-;iey/g oghat all the gravitational energy is converted to thermal energy, by whatvi/g8ms;ee -,r9 .v86 ovolr5 cc ztyg temperature does the water rise?

  A 200-L electric water heater usye2qk*qvo f1pwjd8-*mxw5 4 a es 2 kW. Assuming no heat loss, how long would it take to heat water in *2fq*mapej d1vwqw8o-54yxk 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 20 kg of wcpb8 9f11 xk9fwq9fu)avuzph :kh k7.ate :h1w)9ffbxu1.kuh7pcv aq k 99 8kzfpr from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 100 rytg67 qk-iltqb 67(f v:nau90 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 zf e 6pwd 6sd,m4:lj -7w.dqulheat = $0.11 \; cal/g \cdot ^{\circ}C$), 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 ta/g8jjy *;n)kulu6ps o change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is q ky qz4r/l1:manzu u4g1z67c3 s.nggrequired to melt nnmqykz4lgzcuz6 r473 s/uggq :1a1.200 g of ice?

  How much heat energy is needed to change 10 kg l 77dfau9g/yeof ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs nt+4xm vcdd1 u xa5;.bto be removed from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. Whenkfp8 /oy-9hh2ws7iy blunn94o 44f j u 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 initiq ))li+o))c lafw. fnually 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 aj8(wsttr/ t1 bt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg l/r0 1zmgu ef,oxs50rn4s5n uof water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required 3m c,v k8vn1pprn:8adk5vxd 2to change one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is reqqm,bgqu ea:f;* t7w q6o1atz6 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 hot tea h odq7fcvbt,wzgg(,()9,a d e, 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 o yhuymz8a-6 c,vtzc b-0p3y5jf lead is 5.9 kcal/kg, and the heat of vaporization is 207 kcal/kg, and its melting cm -yz 3ctyy,azh-5b0j vpu68 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 conductivityjk)i:tf5:m y d of 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 (o8+.s aasl/wrmne 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 wma8+/s s.lra 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 ,eg ru.dy/y:e : lsx hkib7-6jm by 1.5 m. If the outside temperature ih/keb,d:e ji-u 6l:7ry syxg .s $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cm thkjek j1kt2, 2: d).qxk1ypvjgick has dimensions of 3.0 m by 1.5 m. If the outside temp2e q yj k)kv2,1 j.ktgjd:x1pkerature 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 coqshohh c+yds 8 a*jto6 -)b*c*ncrete (d -b8*hh +jq 6aht csscoy**)o$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 10 cm thick if the inside temperature is $21 \; ^{\circ}C$ and the outside temperature is $4 \; ^{\circ}C$?

  How long will it take tx +r+i *ri;jjhqo9z0mo 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 4000ym1kb5qx 9mr 2 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 ft.d*s1kv1 d8dual ;4iw,jq ydor refining steel, the temperature is monitored by measuring the radiant power emitted throught.d wyk1aqdj 4s8v;id u,l *1d 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 radiati:z ;e:jxwx sx8ng 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 co9dijzuat1 sa7 o 7db5w -c+.+z epy*ptllector (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.