Which of the following is the smallest unit of hev(/4+4 akht w rmleq./n0bsdq at energy?

  The amount of heat necessary to raise the temperature of 1 gr b./nz n 2i*i2nbk939mrubhgs am of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecules is referred tych/2y9az g l*tscy g:w 7m45n dbqgr26+v-e wo asq- gvzcdc:9wy2rn weal5g s4gmb 6 y/h*y7 t2+

  A cup of water is scooped up from a swimming po51k/d7:jw;0 x+q dg esf0wknoj j 6dekol of water. Compare the temperature T and the internal energy Uq :keo/fde+ g5d0xsww7k n1jdj06;kj of the water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends o0v0ue5rj/m ffyplu:hsq r9)4n

  An ideal gas at STP is first compres0v1u ic6xmk2.oe zrw.sed until its volume is half the initial volume, and then it is allowed to ex6.zi 2k1ruecvom w0.xpand 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 internaeztr(j e6s2 7yl energy 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 tho4jbrb 6bw t;d8*f9slat

  It is a well-known fact that water has a higher specific heat capacv hk kzu4p;lwu)7 yp:8ity than iron. Now, consider equal masses of water and iron thatpy p w;)u8u 4kvhl:k7z 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 up of a hot piece of aluminum and a p*3 2/5c.0q5o tup9tn uxmovu5 ej pnpcold piece of copper; the aluminum and the copper are in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the greater .5 uex3onp9o p/5tp uuqv 5*jnptm0c 2magnitude 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 k l1v:oodnye8j *,nl6- *nvgustate is referred y o1n*lkv,nvo6g*l: ue- j8nd to as the

  The heat required to change a substance from the liquitfm 8r*8gpc9x2ctnc (d to the vapor state is referred to as cnxc(2 8ttpc*g rf98mthe

  If heat is added to a pure substancecpmbr:*4k(w4pa7 lo f at a steady rate,

  When a solid melts

  When a liquid freezesspzd 6*r qeulcd* 5o)8hfv:h(

  When a liquid evapor.:buqcuh h6. os+7by fates

  When a vapor condens ym3tg) r:u+bk 8k qd+mssw:+pes

  In a cloud formation, water vapor condenses into water droplets which v .ct:yqc9 ;laget bigger and bigger until it rains. T;c9.:yctl q avhis will cause the temperature of the air in the clouds to

  Turning up the flame un9hkvlt v 9t *s4 6r)xywb21hxtder a pan of boiling water causes

  Equal masses of waterq/ 0l1q/z ip 4llixron6ro .(t 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 means ofj 2j br;d h2p;g7yezy76mqvs: molecular collisions is referred to as yvjepj;d 2y;67bz m 7:hsq2rg

  By what primary heat (dwk 8djl,5z+7 qqlkiv85g ye transfer mechanism does one end of an iron bar become hot when the other end is pla8vl+5qg yi75e8ldwj qd kk(z,ced in a flame?

  On a cold day, a piece of metal feels much colder to the touch thanhj( cpgy8mhy l/-dg0r -83dg;s6lybp a piece of wood. This is d8drp6- yb l jmg3 lgyschd(/y08;-ghpue to the difference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous materi*jc3v7 f(acrg al, the rate of heat loss for a givenc fj(gvac *r73 temperature difference across the thickness will

  A layer of insulating material with thermal conductivity K is pla6i9r9xfdpf ybe4l s/r8e(kffn l,xf7fl*6v9ced on a layer of another matenf9 f p9sy4ebifr x/*dr76vlfl9xfl ekf(68,rial 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 molecules394f5jxxa; )u durqly+ er )ji from one place to anothe+qi4xj; 9d5 fa rlxrj u))y3eur is referred to as

  By what primary heat transfer mechanc:i i 590fodkgkqz/0p ism is a pot of water heated on a stove?

  Convection can occur2.k1jggykw( q79l 8h/b o ,rxiva;lo e

  Which of the following best explains why sweating is important to 0;uf:liu8p8 9ig24wetbdgxpcy; / (f1gq jzthumans in maintaining suitable boduyig f 8iq(/uz cb8jx 0gp tw;tg1 lepf49;2:dy temperature?

  A spaceship is drifti cyqw4vkkci: ;y2bm06 ng in an environment 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 the convection currents caus ymb ccqvw6;:4k02yiked by this heating?

  Consider two neighboring rectangular hot o-vj(.*vkuo6 ;yorouses 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 abu6voyo;-. r(o ktjv*o out 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 d*atx3 jpgjv0(/y xe 3 tbwj6/moes the radiati6gxvj3 *0 3jtp/m aej/ytwbx(ng power change?

  The process whereby heat flows inoydz);u:4dc7 p5fl;go sz d*b the absence of any medium is referred to as

  By what primary heat trang4.g c(lhw4.fpdo3n lm+in/(ef z.swsfer mechanism does the Sun warm the Earth?

  1700 J of work is equivalent to h u u:c2kidhe :c-2bniwx1 aib(zg8: ;pow much heat?

  16.5 kcal of heat is equivalent to how much 3gus7d/g(xjr8mb l ,ywork?

  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 temperatrc+p-o-l )mkx ure 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, what is the rk 1-gpx r/kp;w 6b(nfwesulting temperatur1(6 fwp- rxpk/wbg;kn e change?

  A 4.0-kg aluminum blocmdp vdbe(ikvs+0 lu.g7, 0h 0ik 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 k f u;p2ptb k8h.e37f;9nhn(+ ikwph vlg of material 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 atc9z k1xv0bz49;hx wby+s8sji $80 \; ^{\circ}C$ to 60 L of water at $30 \; ^{\circ}C$. What is the final temperature of the water?

  A machine part consists of2u g0p74qxrr igv4,8 ro qtg.y u6kb+u 0.10 kg of iron and 0.16 kg of copper. How much heat is added to the gear if theqvb+76u, qr2 84 .g rkogxy0ut4p ugri 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 metal is mzv6x dw 6p6:;,ogf* ql;qxgaheated 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, initi6p snzk ymk k49qv7,jrrb9df+4t g20vally 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 abok0mb6 c1 m)pt $100 \; ^{\circ}C$ 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 upqi2;; v9ilkno15vxav( g adyon 85 7nx a system that is thermally isolated from its surroundings. One object has an initialdxgx; 89ok7an5v lyi;n 51a( v o2iqnv 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 between :g2 q1bicrsm e r8pv)(various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. mp)gbsi q(rvre2 8:1 cWhat 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. Ass-yt7trbpwese0pa +.9w g (ur2uming that all the gravita9gpr0tw( s t27.-+aw rpyeeubtional energy is converted to thermal energy, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no he, bu9dpv wka*0at loss, how long would it t *a0 kdvub9p,wake to heat water in this tank from $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is use w2-+uk5(cn3b od/esz /ow4e,kafjrld to heat water. How long will it take to heat 20 kg of water from kz 4 cnw3us/ (afj/dw 52eobr+ o,-lke$20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1xwu;n jh5f 3r)9 ghwja-d* ig6000 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 (specifi-)cgup bmr 8t2c 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 st7qkx.ovk,y3nw ,e v6 eeam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is required to m1ly3.vihhk7 a g)ukuv/w 0ur5elt 200 rihlv15) v u uyg3ak.h/wuk07g of ice?

  How much heat energy is needed to change 10 kg of ice at ri*: uu0 l6kr5rj*svp$-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 100 g ofwe7hdn .i+;fm*q e6y;u:x vxs 1p vex6 $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of icl;g1vnf8 kpq-3t d.gxfr 2 lh/e 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 in(. 7m;;nfwjmw z6 vcg eujl()xitially 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 50l+fhaajl,q slq7 1n:bdx 4z $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg o3e1r cm -+tsf2bpt. nkf water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gram 2p t3;7xn 7ej w dkc7s2lqxv6nof $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 g oow8o .2qav)z21iv q el.i-mrl f $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by adding ice to 1.8 kg of hot w(kpy: :b8kjytea, 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 tgjchktjys4r e:v5 h k1+(*7ukhe heat of vaporization is 207 kcal/kg, and its mjgju s kht1+:rcv(75ek*k y h4elting 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 conductivit*3cnzbxk;gkc 4y+2on y 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 , cid-h :y 1r5ly +yax7c.hxhfrods (one aluminum and the other brass) are joined togeth+lf .-x7:,h cixh ac5dh1yryyer 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. If the okri gzrzhi4s x4ypnwv2-*q e0 9u/k8bii.2/c utside temperatur8-rc4z.hbk pv gw 4r/y/is9e*uxq2ii0 2n zike 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 t.:f5q qhsos6a hick has dimensions of 3.0 m by 1.5 m. If the outside temper5oq f. saq6:hsature 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:v4wkz/rvk x8 concrete kz / 4w:8xvrvk($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 heatclf(*o*2jlchvv q, dc y6 8.bg 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 lost throuu0;zezg2qv1 a gh 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 refil hhb.et*q+es); 0eyy;h ce2tning steel, the temperature is monitored by measuring the radiant power emitted through a etey hb;y)+. e0 htq sl2c;*ehsmall 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 hrj6kwkhqck1cw- 4oa(y 5g1p *uman body radiating 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 collector (effective collection area of734)dlly)ql akbe q(s $15 \; m^{2}$) 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.