Which of the following is the smallest unit of heat enerw :5nxuk; kg;ncv6b*w gy?

  The amount of heat necessary to raise the temperature of 1 gram of water byybuai6qxdd/ s35 bylc2d +4a(or y ..d $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of individu +uhc-be5rk(a al molecules is referred to ar(uakh5ce b +-s

  A cup of water is scooped up from a swimming pool of water. Compare the vh 2lb5mqyfhhi3p xe1l;-*rg/r . hh1temperature T and the internal energy U of th1 y1 e*f-l/ ih; xq53hgmr2b rpvh.hhle water, in both the cup and the swimming pool.

  The internal energy of an ideal gas depends ondpa5z q gpj6;bl+8bn 1

  An ideal gas at STP is first compressed until znkk*.p0 z +l2lhc v5w: xz9ilits volume is half the initial volume, 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 finalcvkzh:+* pxwln.2 i9k0ll5 zz internal energy of the gas will be

  An ideal gas with internalo*8(r u+ )svu6.rs0y.pi-oeyvwj nln 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 drastical1 ii+n2fq qmfm 8kke;1ztw. x0ly is that

  It is a well-known fact that water ha54u ;q f 8e8aqlzapzg9s a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium. The same aza;4qq e9 zlup885fgamount of heat, 30 calories, is added to each. Which statement is true?

  A thermally isolated system is made up o z32chq(mz x:4. umzdj,arx+ff 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 aluminum is more than double that of copper. Which object experiences the greater magnitude gain or+:jzudm2 zh x3,acf.m4xqr (z loss of heat during the time the system takes to reach thermal equilibrium?

  Phase changes occur

  The heat required to change a substance fromnv1wl4ix,tl ui4 y 1y+ the solid to the liquid state is refe+l iy4,vxut1w4y1nil rred to as the

  The heat required to change a substance from the liquid to the vapor st6py ak5 /v:rzt r1ki5yate is referred to ariz:r 6yk/ky5 5p1vta s the

  If heat is added to a pure substance at a steady rod*j0w4lsv gge: 2 c :+9ylmqbate,

  When a solid melts

  When a liquid freezeyo+ q(2vur 7yis

  When a liquid evaporaw7b hfx-t; g8:v gvscu:r3 yx2ns3qc+tes

  When a vapor condenses om- t,ycl(rr6o za, q2wric,;

  In a cloud formation, water vapor condense2bpy m-dk4 nc;d n8wyoyf.o:g1t y .y;s into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air1;:f pwyydd4n8. n-ot kyyy.m2;gco b in the clouds to

  Turning up the flame under a pan of boilinl/gdhmp ckn82r:b 1)bp .xd7 ng water causes

  Equal masses of water at0 )gsoqli1o r4 $20 \; ^{\circ}C$ 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 referrj 8/a-*ft9hx bjeo 9zled to aj8 h9*jz eab9 x-/otfls

  By what primary heat transfer mechanism does one egl xf12hs::z-- qqnzind of an iron bar become hot when the other end is 1fl::nzzgi h-x2- qqsplaced in a flame?

  On a cold day, a piece of metal feels much colder to the touch than a piece of :(-brz/jtp0jf mbcni/0xf7 q wood. This is due to the diji:/-zjt7 rpf/bq00f m (bnxcfference in which one of the following physical property?

  If you double the thickness of a wall built from a homogeneous material, thempnp y- kqw 6ms;8sha6 gw66:mo,lo 6k rate of heat loss for a given temperatursg wspom :m66ywq 686,nla- ok;6mpkhe difference across the thickness will

  A layer of insulating material with thermal conxvztqpg 4e23c6x,j 09 .yqxhcductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thqvxj6t2 0 hpq4cx .9,x3ezcgyermal conductivity of the composite sheet?

  The process whereby heat flows by the mass movement of molecules fro,(wkb u dxct;)m one place to another is referre)(cd ktw ,xu;bd to as

  By what primary heat transfer mechanism is a pot of water heated on a shsx:0vn72q1ig9r e a8+nmo- kp bu 5mztove?

  Convection can occurj,g:fns (kcxahsvx p k+,4l -w(1eok33ni*pt

  Which of the following best explai.m l(paus.w/yspp;*wc1;pam ns why sweating is important to humans in maintaining suita1l; ./w y ucswmp;ap*a(mpps .ble body temperature?

  A spaceship is drifting in an environment where the acceleration oavn- rl3 *(oahmm4nr7f 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 cur7rm vano3n(hla- m*4 rrents caused by this heating?

  Consider two neighboring rectangular houses built from the same ma1g,e0bn6xn 4jdpmg+(dr1 2xfj qh pq8terials. One of th 4bngpnhdx6q 8,jm1 x(efj+rqpd12 g0e 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 would need heat supplied at

  If the absolute temperature of a radiator is doubled, by whpze 9 0865oxz+8 l5btcra,g ilzpm(aq at factor does the radiating poweat6m+85pae08lz ro9izl 5,(c g qp xzbr change?

  The process whereby heat flows in c5 q))xyz qr/kq5 zx ggwqe/:3the absence of any medium is referred to as

  By what primary heat transfer mechanism does the Sun warm thez0e7u bs8iu5shtt 2g( Earth?

  1700 J of work is equivalent wfd .fc3h5hv:j6 h.gz to how much heat?

  16.5 kcal of heat is equivalent to8zr)6 xxmj zi8i5 bhy4 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 temk3 4z6h tjeo6d-v /bsel.m2 od +x.cfxperature 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 0 3(uoy rbkyx4ajx (au.s4+e1rca6vp resulting temperaturscu x1vjxu(0eyb y+(ra rkoa. 44 ap36e change?

  A 4.0-kg aluminum block is oe4spauz x9 ;d2riginally at $10 \; ^{\circ}C$. If 160 kJ of heat is added to the block, what is its final temperature?

  150 kcal of heat raises the7y qb kkdmk)ets( )jpj3) a-(n 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 hewx:zf ;dmabb5 hul b./29u9 ctr 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 iron and 0.16 kg o7)zs+i w1cp nuz8* eucea: oj8f copper. How much heat is added to the gear if the temperature increaseszeu ica78 o :scju z)+*18ewnp 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 he5gze 22ml re9l ufir63ated 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, initially 0saqa4gy 7p ;xat $95 \; ^{\circ}C$, 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(m g7a)vkgdg/g4z :ch $100 \; ^{\circ}C$ 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:di+bm7lt- jn surroundings. One object has an i+lj 7nib:d -mtnitial 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 relationsuv)o ,d ;,wp 1o3iwncolq5 cb0hips between various forms of energy by measuring the rise of temperature of water which had fallen down a waterfall on Mount Blanc. What maximum temperature rise would one expect for a wate;b3i do,, cwqc0 5w vn1olpu)orfall with a vertical drop of 20 m?

  The water flowing overl +ez535 0ve 3ullroqj Niagara Falls drops a distance of 50 m. Assuming that all the gravitational energy is converted to thermal energy, by wh 5z luverjl+30ole 35qat temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat loss, how lolnmgnws254 7 rng would it take to heat water i2r g 47lsnwnm5n 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 az*/ddqotndgb)0,q 4* 7ti sqwater ,g*i q s/)d4q0ztd*oqat b7dnfrom $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (mass 10q n3i;2b tls6+iya7im 00 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 kngzsol w*h0//:ph.iicife 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 removed fcimzqnv2y df0l 1 b8.lb iq9l)tr*w,3rom steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. 8 lt;*necl ar7 How much heat is required to melt 200 gl8 *t ne;ar7lc of ice?

  How much heat energy i/d0q xh96xp wvwmk 77es 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 100 g .3a 4zkm1k+ee xxuwv0 of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice ispg dd2t +rw*0a 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 initially5b bse;w:a p.y 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/g0 u9mn o.et /rsb*xx $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 kg o r.+u f/dy.h tm+eb,eqf water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to change one gramc 64xhokir+9 z) cc/af of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is required to change 100 gg u4l*xhg ;+j9ec rhje yvxty(7 )t)8x 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, initially atnfy2t8e d8 trzm4j)dz y/gw-y*f,d o/ $80 \; ^{\circ}C$. 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 vaporizati l+ 4jyiaio/(hon is 207 kcal/kg, and its mi+lyi o/a 4(hjelting 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 conductiviag9k)(*d ra xnty 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 twiceh2o eli 4/a: xnp1qra9 that of brass. Two rods (one aluminum and the other brass) are joined together end to end ipqxa2r:ae49nh l1o/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 digux3h9tz8n (umensions of 3.0 m by 1.5 m. If the outside temperature tn3zux(hu9g 8is $-10 \; ^{\circ}C$ 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 d1ib/mi knu4h7g oz.s k(bg7( zimensions of 3.0 m by 1.5 m. If the outside temperature ik /m .7zgi(4 hku(ib7 gbns1zos $-10 \; ^{\circ}C$ 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 througfy 9t8r +kqfka4ux;nw ,n95hch a 2.0 m x 2.0 m section of concrete (nku899,q 5fxc4 fk +yhnarwt;$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 he -w5zi0ue0sl cat 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 4saqdwyx4dk9 f,2iyq ,2 5sb l6000 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 for refining steel, the temperature iw3gvvlk;akq.s u b f8z5i94+qcay. i5s monitored by measuring the radiant power e3 f.5+s9 kab q z.ywlviqiv4agk u85;cmitted 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 radiaxkn2yx,+a w,l2 oile0ting 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 (j,-6t hf ig7lyeffective 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.