Which of the followic ;1kgy//sjc2v, zc wmng is the smallest unit of heat energy?

  The amount of heat necessary to raise theyy1nohx8,)gk2k f4p a temperature of 1 gram of water by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individual molecule vd 0zhjqsh)o,yg w:q9t, lu,-s is referred to as ghhvu)q 0 ,lw9zs: ,y,-todjq

  A cup of water is scooped up from n0ari ib vrrga32)l5 ) a,x*sxa swimming pool of water. Compare the temperature T and the internal energy U of the water, in both the cup and5sg ) l,*0axvr3x)2 arbi ianr the swimming pool.

  The internal energy of xagw9ntc1 95ia 3cfh5an ideal gas depends on

  An ideal gas at STP is first compressed until its volume iiar1 ,qsv0kz,bo 4h0fs half the initial volume, and then it is allowed to expand until its pressure is half the initial p1 h0 ioqzkf, abv4rs,0ressure. 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 wtc dx.ss02or. y ,/kcenergy U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatures do not vary drasticallqm*1i1n 9b,pg zzn*+ kiz5g *lxhi:q8lm bm2 uy is that

  It is a well-known fact that water has hr 0zrp1 *cp6ga higher specific heat capacity than iron. pzg h01rcrp*6 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. Which statement is true?

  A thermally isolated system is made up of a hot piece of aluminume /oktw21v.an and a cold piece of copper; the aluminum and the copper arewkveoa .n/ 1t2 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 the liquid state is rm v2ui10yo0gyj t2;f oeferrei ug0m;y2 t1jyof0o2vd to as the

  The heat required to change a substance from the liquid to the vapor sty,d/npne b jiq,f;c83 ate is referjci, ,n e ;nfbyp3/dq8red to as the

  If heat is added to a pc86/+j((l n p/jpv kddtz 1semhuqg*3ure substance at a steady rate,

  When a solid melts

  When a liquid freezef*bkk6iapc (88dc )vjs

  When a liquid evapor)p edj.o;90c otl f-ucraxh. 54jm3rq ates

  When a vapor condenses(dg5)qv, +lihqc+mw9u) temk

  In a cloud formation, wa 6y qx,xvadom6xu0 x8xc/g:s) ter vapor condenses into water droplets which get bigger and bigger until it rains. This will cause thxq ayx0xgv d ox/,6xs u):cm68e temperature of the air in the clouds to

  Turning up the flame under qfg+1j5 9hm+ryy8 snra pan of boiling water causes

  Equal masses of wate pa:is4 ug,u5ur 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 of molecul*p 0p9-u*gmp n3p wofrar collisions is referred to apn*-0pfu3 prpg 9mo*ws

  By what primary heat transfer ors 1mlvv71f(k(y/2gr oz:e rwq7 oz)mechanism does one end of an iron bar become hot when thk f)e v2oo 1yoz7z:lw(s/r(7 qrrgm v1e other end is placed in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a ;0xu .3w;y z+ oky* (whkvl2wmphct1mx+pyg )piece of wood. This is due to the difference in which one of the following physical propertyowwc ;y;*pp(x umz y0 g1+l3w+2h)ykkx tmv.h?

  If you double the thicknetqus- e1/+i h4 qb3ahpss of a wall built from a homogeneous material, the rate of heat loss for a given temperature difference across the thick-/ hp4usqe 1qb t+h3ainess will

  A layer of insulating material with thermal conductivity K is placed on a layes2-icuytmr pnt3 +l;- r of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductiv -yrmcpis;+nt 3-lt2uity of the composite sheet?

  The process whereby heat flows by the mass movement oyoc 7:gb 6rg.qf molecules from one place to another is referreoc6b qr.:gyg7 d to as

  By what primary heat transfer mechanism is a pot of water heated on a stov2 e h8my29aavqe?

  Convection can occurbu:t/8 xr2 tfkn*n9) ofb+chr

  Which of the following best expla8 h8cd2m 8. .zipg1 z-sftbxija+w )zoins why sweating is important to humans in maintaining suita+pmsxjd-hzz28 a 8i .g)wf.zc1 8t oibble body temperature?

  A spaceship is drifting in an environment where the acceleration of gravity is ekykzttr 1r5 3:l97rbr ssentially zero. As the air on one side of the cabin is heated byrzky317t9r 5r:rbl k t an electric heater, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses buifb2m2.u4lkn elt from the same materials. One of the houses has twice the length, width, and height of the other. Under identical climatic conditio.buk24 fnm2e lns, 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 isbt84lgw upgl6p kau ,.8a +z,b doubled, by what factor does the radiating pow a8al4u+bpwkzpg6, gu.bt 8 l,er change?

  The process whereby heat flows in theb g5tvn*q5nl/ 8o qas4 absence of any medium is referred to as

  By what primary heat transfer xj1bh9e8 5ec hmechanism does the Sun warm the Earth?

  1700 J of work is equivalent to how mbhh3drwlk uo3h+s+ u.j5t 0 )quch heat?

  16.5 kcal of heat is equivalent to how much wogv7w;hfn2 o3zj5wlzf*ew (p+a s7v;,g dw* brrk?

  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 temperatu a*e* g*qq7uxdre of 100 g of lead ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added tovi- atjx25ts2 2.0 kg of water, what is the resulting temperaturvt 52-i xs2atje change?

  A 4.0-kg aluminum block is oritj37wj.x j lgv.-a1y hginally 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 kk9et3 jxilpwde)34g2g of material by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water by addj94 f,v-l3wzheg 02nheypl m 2ing 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 kgy /06o p8jw jhxoj,94 m pxt3,bzw0sea of copper. How much heat is added to the gear if the temperature incb w,p0m60yxzsxhj4a jpe8o /w 3,9tojreases 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 heaz4:lxwjc/1r ef2o:dfaiss 7: ted 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, initia kvq1m.qzps+9rb: ;eelly 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 atpoozj;m,tw3gc;ac( 5 $100 \; ^{\circ}C$ 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 il5 8s y d1 6obugi4v,42a:pi/8fud /zbqb fvxus thermally isolated from its surroundings. One/zf64 ivsf yi,24:qbu 8g 5l vud1xuodba/bp8 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, Jame5i/ j-id;mow w bs9(fls Joule attempted to explore the relationships between various forms of energy by measurings/-i5 bifm9ww(o dlj; the rise of temperature of water which 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 Niagara Fa9edqzyvq i0)2.j g:jdlls drops a distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by what temperature does the water rise eq)ddijj0q. 2vyz g:9?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, htw,y(pkp6., v *k kzyhow long would it take to heat water in this tank fromw ,kvkpz,y p. *tk(6hy $23 \; ^{\circ}C$ to $75 \; ^{\circ}C$?

  A 5000-W heater is used to heat water. How long will it take to heat 20i5)sp9 .ewxwqo c,b(d kg of water5 .(,wi ecob) pqxsw9d from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 1000 g, tal04 ymruo 9i5ce9:v$c = 0.22 \; kcal/kg \cdot ^{\circ}C$) 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 k87jo9dxui7 tpai p.fq /m;+9q aqd8hg1/svbknife blade (specific 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 rf- shnk5 wqe1+emoved from steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is /e8 :nypv jvu mngej,i+pl49 ,required to melt 200 g ov/i8e,+jpn my:,l vpu j9g en4f ice?

  How much heat energy is sep9tb9aq4d) needed to change 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be removed from 1om ylj6.6hzhztoyy9n (cy+6gbe)j 2 200 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 kcal/k , kxe5.oqsasaxpwp0(tz, :mgsk40x3g. 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 ini1,dq a4 gem;o3es n+uhtially 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 athy0eqi/mo/t 4 $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 1 uiwstg (yu wa -je8)d-b4v*6u0 kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to cha 3m ax3zy* v4-l )s4ryhz6vxwtnge one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is requiak4 6c*s o) yii lw opd5jbn(3pz(,pk1red to change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea by 8-v)nbe6qq zh adding ice to 1.8 kg of 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 o6q-khy 8c 2lrhssvi ,0f lead is 5.9 kcal/kg, and the heat of vaporization is 207 kcal/kg, and its meltinsl0k,s8rh yvc- hq62ig 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 conductiq /drrn6q u t2 riq*y0gu/tgij0f8*n7vity 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 (one alumz e6op7yz w2m5d* pz;uinum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii. The freuo;zp*z5e ywm27z 6pde 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 2ldrb729niiv 7lw :nh3.0 m by 1.5 m. If the outside temperature isid2vn7b97l 2rnl: i wh $-10 \; ^{\circ}C$ and the inside temperature $20 \; ^{\circ}C$, what is the rate of heat conduction through the window?

  A window glass 0.50-cm thztzf v6b24*(k ajz:w hick has dimensions of 3.0 m by 1.5 m. If the outside temperatuak2bz z*v4t: wzjf(6h re 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 1s:af(9k9nsh d+1w das gz1kh ).0 hour through a 2.0 m x 2.0 m section of concrete dzk1 +hw dn(:kf)as 9ss9a1hg($k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 transfe,o7w yv-ex4n4s5 ik zvr 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 of heat is lost thro: gsub8k60/lp(hhiwbg gx5)m r)bd n 8ugh 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 r7t *ljfcymnz 4g4.k2 xefining steel, the temperature is monitored by measuring the radiant power emitted through a s4c7k l yx4jftm.*n2zgmall 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 231aihqy4l uis0p q1yenergy 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 aknwemz5 :b(z2o-4v g vm.-2ogw xn2y xrea 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.