Which of the following is the smallestree p0 0vikk1tj/y4 0b unit of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of water .airk j -jbbwv(a zf9c.i6z6* by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual moldsg/iiq.n j1(acyy6qna3p94jn1.f cecules is referred to n1. ac9.a36q1 iij(/s qfdnypg cj4n yas

  A cup of water is scooped up from a swi3k0f:d:w.l 2xrhf dm smming pool of water. Compare the temperature T and the internal fm2:r.: 0wlsdhdxf 3kenergy U of the water, in both the cup and the swimming pool.

  The internal energy of an i wxlt *5,gv-vzbd2 )tcdeal gas depends on

  An ideal gas at STP is first compressed until its volume is half the ing3gd)d(j ha(ddeu) z5itial volume, and then it is allowed to expand until its pressure is half the initial pressure. All of this is donegug3( (jdhz de5)d) ad 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 ene3 a 1m(pst504.cejmf/v,r-gtc jj vhhrgy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do n0jny6i tgxv zn u-71fpn:/1 pyot vary drastically is that

  It is a well-known fact t5ee/(vv 9neuyyqs8 k4hat water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same amount 5e8kue9nsv(/e4yqv y of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up of a hot piece of aluminum and a coldhuyjz2 0t4ut,77t/vd4jk1ehky du(9i xn*g r piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum iydttju eu/7zkhkg9*1240xr7 n,4t jvdi(yu hs 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 thqf8 ovj8fbd,2 e solid to the liquid state is referredbjqv 8f2 do,8f to as the

  The heat required to change a substance f(8,d mywoue+ldk yv9;rom the liquid to the vapor state is referred lweuoy( 9 dd,mk+ 8;yvto as the

  If heat is added to a pural3+fori my52 3h6kmu e substance at a steady rate,

  When a solid melts

  When a liquid freezeok(:e jnm8)lh s

  When a liquid evaporat.9:1yqmihxedks fu9 i:x..d km7 tgl4u dk;9 mes

  When a vapor condenseskh2+ve+n 1ty z

  In a cloud formation, water vapor condenses into water droplets wbtrg f88ps9z2v7;iek,d/ qjahich get bigger and bigger until it rains. This will cause the temperature of j8z/2 sg;f e9t bivkaqr8p7 ,dthe air in the clouds to

  Turning up the flame under a pan of boilin8 1z1vt )2(uhykr t9mryyz5:gtw( cebg water causes

  Equal masses of water :w* a*g ,1lnsezy0o fiat $20 \; ^{\circ}C$ 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 col )09nmu a,mcqmlisions is referred to aam0mqmc)n 9,us

  By what primary heat transfer m- 5dgh1 thy/jrechanism does one end of an iron bar become hot when the other end is plt/1rh - d5hjgyaced in a flame?

  On a cold day, a piece of metal feels much colder to the toub;;djw r+rgv,jpl4b i 2 n.cd.ch than a piece of wood. This is due to the difference in which one of the following physicdc+vrgj.2;;b d,wb.l 4nprijal property?

  If you double the thickness of a wall built fh-vdjaevfjzlmk7. i; (2c1- nrom a homogeneous material, the rat-.ckajmievvf2 j1 lhz(n- ;d7e of heat loss for a given temperature difference across the thickness will

  A layer of insulating material/ib** r/)zd3o:uh z8sd-x4z wuvtn e d with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet /)d* udxiu/v4n- *eb8trw:d3zo zsz h?

  The process whereby heat flows by the mass movement of molecules fqohu*d)2 (xkb rom one place to anot*quh okb()x d2her is referred to as

  By what primary heat transfer mechanism uil0an0 7:l knap 2pr4vu4a z3is a pot of water heated on a stove?

  Convection can occur4v bdiw-d iv*5v zx;d-

  Which of the following best w-g ,2-7bwk;2 cm oat uzogmw)explains why sweating is important to humans in maintaining suitable bwga;gt-c z 2,m2o) -owbkwm7uody temperature?

  A spaceship is drifting in an environment where the acceleration of ghe +n-p ils*0gravity is essentially zero. As the air on one side of the cabin is heated byp0 g-*elish+n an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the same materiar;mbu8 aol qi 0kb,)v/ls. One of the houses has twice the lengb;klmq 8v0 ru,iob)/ath, 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 factor does text( sui/f v99na4 z*muy*4e hhe radiating power c4 a4t eeh/ms9xv*n9y( iz u*ufhange?

  The process whereby heat flows in the absence of any medium is referrecw k)eus(/h g *q750rkni it4kd to as

  By what primary heat transfer mechanism does the Sun warm the Ea. g+od5**d/ oyuvjl iarth?

  1700 J of work is equi9+up8pjo/o 8.:e ihnvokiwo:j/o9 yuvalent to how much heat?

  16.5 kcal of heat is equivalent to how much w*c3r4a cpsv.s;4 ribmork?

  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 ovolj.tzvnk: 22h/j ho +-j4 zv3h+x vof 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 zu8 5rt 2wnef1:l6z4w j/fb y ep0qv+wresulting temperature c wyew0b u+ z 4wpfv1r6q/8l:f2etzn5jhange?

  A 4.0-kg aluminum bl waqn13m5 b3gkock 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 t,gb3wjacp4 : r:jr t(mhe 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 adg yrury,:1j; ading 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. How much hea s.5 mb2 gxs-)l4kejset is added to the gear if the temperature increases e ls2sk-b4ej.sg)xm 5by $35 \; ^{\circ}C$?

  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 met1ge,iu 76fhp4,hgdfy al 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, i x qlw94lofv.6 iq 36dfg6l8o64x3l+yn lfzcq nitially 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 x 67xji z08n8;ojglqf$100 \; ^{\circ}C$ 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 isolated from its e0 ypvynz5j o) (d 23odmra7*c6rt8q/tra2tvsurrounding05op ae )rdt7t3 m(tz6vn *2d/y2a8c rojvyqrs. 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 explore the relationshipsa+/ jd,k)eose0 c4i1i1ci p it between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximi)/, s 40 eica1+1t oecdijpikum temperature rise would one expect for a waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Fallsr tyvw+hs*; g,/ubx,p-a +kes drops a distance of 50 m. Assuming that all the gravitational energy is ;v/* up +kws -hrxye,ga,+btsconverted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater 8vb73fdm :truuses 2 kW. Assuming no heat loss, how long would it take to heat water in this tank from r tf3mub:v87 d$23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat yw,7 gcs- -djrmr s;n+water. How long will it take to heat 20 kg of water dn-yw +-;sr sj,rg7mc from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1 qk,kxg6pkq( ,j xn1ryzr b 8q2i/*x.u000 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 (spzy5 r.wp2ue ldn) 6zx1ecific 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 ch,4 5rvgf2u22q pk yichange it to liquid?

  Ice has a latent heat of fusion of 80 k4:jasw-p/nc.a zra1kw2d2nh cal/kg. How much heat is required to melt 200 g of ice-. 2wa 41/paha2wnkzsjr: dcn?

  How much heat energy is needed to change 10 kg of yxzcw;u9 )ts/y6v-r.rm i,u sice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to bl nam8- eg8zq;efhh -/e 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. Whednuphydm)tg9ub k ;+s+27y a7/7wze cn 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 initv2 lg95cwbrjei n( 2u-lk/3ax ially 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 av263t8w hzs6trhahrlam5), (p p;dwmt $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg of wavh+v:rwpn8i p)g gn( fd9u(gq (t)pih:-zgx *ter at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gram c6,ov.gnavuo ju2x w9wvb3 1, of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required tmt1 udw/b aiz8r41sl4 o 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, initial x2 mk6rk;8jfmly 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 vaporization is 20)/hmhy1t; zzk7 kcal/kg,m/h 1 ;hktzzy) 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 concrete is l )aexxn1)z ;z$0.8 \; W/m \cdot ^{\circ}C$ 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 rocp4.1b u g3.e7we7oyl c2o mmods (one aluminum and the other brass) are joined together end to end in excellent thergue7yb.7 ocp4oec31 lom2.wm mal contact. The rods are of equal 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 1w vlta5af3 ;3z.5 m. If the outside tz3a3;ft5lvw a emperature 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. dj52v8 huocvz: fp/p4nv4o,y 5 m. If the outside tem /v: pf 8dcuoonp4v24yh5 zv,jperature 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 o45zu k2ld5nal f concrete (uln 5d4z al2k5$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 throu:pa knohe4a.6 gh 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 through 7ihw.l (.ryp6 /+jiwma ebv+x2ic) 1cz5q lon 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 usicv3io rc afo3w d5+f8*6/pated for refining steel, the temperature is monitored by measur v3iacpif*o+3fwdt c85aro/6 ing 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 wh3z yc 1/ebfzgrhv;9qes)e80 c o1pg,sen 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 (effecjchv r5 p41f)a k8q8gstive 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.