Which of the followif 8/ac:c -)yopswdia vu47plmjb1n 52ng is the smallest unit of heat energy?

  The amount of heat necessary to raise the temperat tw- -nc 4su3.ssioib8ure of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic ener00xxunj5yzn + sno11 egy of individual molecules is referred to as 0+zyo xux 50sjne11nn

  A cup of water is sct gxr-4/koo*u06e r oqooped up from a swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and th 0* rg/kr-4eo 6xotouqe swimming pool.

  The internal energy of a9-rawskwur: : d5le5fdac7u-n ideal gas depends on

  An ideal gas at STP is first coklb97ts)cr4 gmpressed until its volume is half the initial volume, and then it is allowed to expand until its pressure is half the initial 9gt4 7klsc)brpressure. 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 eneawiyw; 7;/c r 0xk0esprgy 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 thaj+ 6 h;a,4x utjf sp8m8(hh;ksjoh *aot

  It is a well-known fact that water has a higher specific heat capacr 5qfsa,+;gr3c ad x, iy0x1elf )0zecity than iron. 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. Whe,ra,5cx0 s er1 z0fd+)yi fqx3aglc ;ich statement is true?

  A thermally isolated system is mad))s8bzex18 lhf b+zg7w *n nlqe up of a hot piece of aluminum and a cold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of szwegbx8 f1h z+n7nqllb*)) 8aluminum 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 the liquid state is iq 0xs nit.lf6zjm gny- 5-y0,referred to as theyzg n.,0- l06nsmtyq ij-i5fx

  The heat required to change a substance from the lahg2 . wet-f1piquid to the vapor state is referred f1h 2w- a.egtpto as the

  If heat is added to a pure substance at a s 8telu 7.2rtw-uv.fi oteady rate,

  When a solid melts

  When a liquid freezes/eak wyqu3m1o 1f r++k

  When a liquid evaporat*hrp7 m)u:egq 1/tqle. z+t dges

  When a vapor condenseoe,u( 9v;k o achf-(ens

  In a cloud formation, water vapor condenses into water .)8gkl nsp.vp droplets which get bigger and bigger until it rains. This will cause thpg.ps l n8v.)ke temperature of the air in the clouds to

  Turning up the flame under a u/w fvxhd7 r c: +dg(rz4.wht6pan of boiling water causes

  Equal masses of water at t6j:*gznq bm8+vy 5(txj /gth $20 \; ^{\circ}C$ 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 referreg yf)m.a ph.7zd to a7p mayz). hg.fs

  By what primary heat transfer mechanism does one end of an 8okvvh 2plk+33fa 6tliron bar become hot when the oth3v p vkak8tl+23o lf6her end is placed in a flame?

  On a cold day, a piece of metal fe2rjqadl pq0gj 9. jr27m6x4;q de nv.nels much colder to the touch than a piece of wood. This is due q.j4rprm lnd9q vj2;7 0n6jqx.gad e2to the difference in which one of the following physical property?

  If you double the thickness of a wall built fro4 .lq;:)jxuf mc5g qpxm a homogeneous material, the rate of heat loss for a given te;j4m.qg5q x:xc l) pfumperature difference across the thickness will

  A layer of insulating mate mv+e,edw4k0q - atsd9zy af5(rial with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is asewya0mqevd- zk,4+ f(dt9 5 the effective thermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecules from one place lyrj r4bhln,( pr ;ho 43t1;l6i.jxw ato ano1rl r;4l.jl iyr3 bhtx p4;nj6 o,haw(ther is referred to as

  By what primary heat transfer mecb:cr)bv p:1q *xngu6bhanism is a pot of water heated on a stove?

  Convection can occurq.v0jdfui7hlzqv 2s q 4v48n-

  Which of the following best explains whygi41uh l1tf ay.+6au m sweating is important to humans in maintaining suitable body temperatu ui4 l+fth6ugy 11.amare?

  A spaceship is drifting in an environme/5 rdkoryw q;qv9;3zjzs h:(pnt where the acceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric heater, what is true about:9qo(zj kr5;ry;shq wzd3pv / the convection currents caused by this heating?

  Consider two neighboring rectangular houses built from the sacqi8*sqc ey 6vnc ;m4n5.vhp9ehx5q * me 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 the same inside temperature on a cold day? Compared to the small house, the larger house wousccn;h*yv*q n6cp4 5xeiq 8 vq9e.h5mld need heat supplied at

  If the absolute temperl p+na4b.0 3uziw ucd:ature of a radiator is doubled, by what factor does the radiaz0+ wip nubuc4:la d.3ting power change?

  The process whereby heat flows in the absence of any medium is refer t5lmqzl0l 9m7c7e6c ered to as

  By what primary heat transfer mechanism does the Sce1ae 0vhe6c:hxo w *,un warm the Earth?

  1700 J of work is equi9faidpfv v 9(ppm+-a5d5)f opvalent to how much heat?

  16.5 kcal of heat is equivalex itcen1g9e :/(hdwa6nt 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 temperature of 100 g of leadh :nbyzj*fp1 / ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, whaal7efuptd.wk 7 (n06z t is the resulting temperature chaef.6 0anl77z (udptwk nge?

  A 4.0-kg aluminum blocj im ;j6p/pd5dk 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 kglbpw+don1d;n i (g6 w) of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat u0 /dvzbd0 nrp)a + soz;l*ib3xp her bath water by adding 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 irow30fxfwq 9rb 6 //)nbish x:huiqq-8zn and 0.16 kg of copper. How much heat is added to the gear if the temperature increases byxw68/wxhqrq- bhbiz9n3/:q s iffu )0 $35 \; ^{\circ}C$?

  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 heate5ltae;jn(1ps :rww2w+ /zx mcgs 4lr- d 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, initiaelcj(/i 8 xjph d39lqx2p- je4lly 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 o9 o6tvui0:52xdb de iwaz78dpa8k6gat $100 \; ^{\circ}C$ 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 systl 0c1jomu*bc;a vt;hoegh2 1 -em that is thermally isolated from its surroundings. o1c; cm02 valjhuoght*;1e - bOne 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 relationships b6tdv ..g d+sgtetween various forms of energy by measuring the rise of temperature of water which had fallen down a v+st.tg . dg6dwaterfall 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 distk-j 7 dnp52 gw;uk,hiqance of 50 m. Assuming that all thkk 7jg;p, -dh52wuiqn e gravitational 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 wo91ykb:rrq u7b uld it take to heat water in rbub :971ryq kthis tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat wad2wjqnp03 h-ater. How long will it take to heat 20 kg of water from -3n0 wqdp2j ah$20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mal;h8q . p-mi(gjrfe)k b;ncx7 ss 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 (9fxe( 1a du06z:utagpspecific 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 remoyuq*t7l 0edy4- geb*xp ;4lkwved from steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg.n-*bi(dw.zntzn+wn .f*z : :z oaps *e How much heat is required to melt 200 g offnn.(a:-dzzonns* i*bp+.w*:twzz e ice?

  How much heat energy is needed to change xep ccf92;oy8jqm4se 0,+orv10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 1 rx xqo3zhd-i9l(:od4 00 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/kg. Whey5fuy etd6f*5 9kt2hfn 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 atw u p30b6t0xs3fzzx1 c $100 \; ^{\circ}C$ 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 auvm)hd7o(p p7;9fnnit $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 irg)lx--zf- l,1pcj okg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gram 6*uy//qnufo ikzbvx-n5 v9,xc:yr9rof $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required :,j e68+f*vojammy5;eyjx r16nzb vrto 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 9;+vb n i 3(yihuu.(b9kmw cnsof 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 vaporizatio -fpv2 5 yq)rde.u+qrtn is 207 kcal/kg, and its melting poinfv)-yuerq q5t.2 +d rpt 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 isqt3gxo+8 yjt; ee:e0om* 7v2ixr g.ttxsp/ d0 $0.8 \; W/m \cdot ^{\circ}C$ 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 alum3ci8k2qn o5g s+/9q jdmi q0lminum is twice that of brass. Two rods (one aluminum and the o i+3 j98qqcmk/nsdi50 mql2go ther 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 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 m. o8hz,c o*y.z dIf the outside temperature i*coo.yhz ,zd8s $-10 \; ^{\circ}C$ 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 1.5 m. o1cwuc;8 .jbeIf the outside temperature i8e;ucj1 wcbo. s $-10 \; ^{\circ}C$ 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 voyy.r84a pp*gya3b;m section of concrete .yp48o; a vy bgpya3*r($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 cqn+ 9 ep5jr0ofal 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 heat is losxw(pcn*8(i xzt 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 monitoredrn asoyz7a)v1n3 nt77 by measuring the radiant pown3oa )zr7nyat7 v7n1s er 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 .a 29saaaa* lp2/ hg )hvv)nblenergy 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 collec9 xx3urjghq3x;xc ./q tor (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.