Which of the following is th(qi(d 8q 4loape smallest unit of heat energy?

  The amount of heat necessary to raise the temperature of 1 gram of wdp2p z2c2.g hwater by $1 \; ^{\circ}C$ is referred to as the

  The measure of the average kinetic energy of iy0 ga2fikfhv;q x/zt 1/f:z0 mndividual molecules is referred to a afi21gth /xvzf/km q0 :;z0yfs

  A cup of water is scooped up from a swimming pool of water. Compare the temper)znu6/hry1 kzature T and the internal energy U of thnz 1ykzrh )6/ue water, in both the cup and the swimming pool.

  The internal energy of an -6jch oaqcl16e5 6luq ideal gas depends on

  An ideal gas at STP is first compressed mvf/(gy0mh)w +i kfkh-vzn19yiym/ 9 until its 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 final internal energy of the gas will beyk h vzy +-1yhmivgfm/ink9m9f/ 0)(w

  An ideal gas with internal energy ol syx+4.(8qpeaob5q*odf 0y U at $200 \; ^{\circ}C$ is heated to $400 \; ^{\circ}C$. Its internal energy then will be

  The reason ocean temperatuhli*,29 8sc ftvv ,57 y3mafsao7kiah9x opo ;res do not vary drastically is that

  It is a well-known fact thyv 61bdq-o2amwfl0n b(tyz,2 at water has a higher specific heat capacity than iron. Now, consider equal maq1m 0ybbn-2o,yawd6l tf2(vz sses 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 systoclpla */a:i7z*h s0fem is made 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 aluminum is more than double that of copper. Which object experiences the oh* il*7cla: fp 0a/zsgreater magnitude gain or loss of heat during the time the system takes to reach thermal equilibrium?

  Phase changes occur

  The heat required to change 2)upbp/3: po wey1ukdi l;*q4r: dlpga substance from the solid to the liquid state is referred2 dp4lpw:rp:i peu/byd1ql)u o;k* 3 g to as the

  The heat required to change a substance from the liquid to the vapor state is recf hkn+6w ;0referred to as th0fk;w c+en hr6e

  If heat is added to a pure t aqg) ;hh(9rnsubstance at a steady rate,

  When a solid melts

  When a liquid freeze,:+m 8zycsdmy s

  When a liquid evapor 7zuav js8s9r9t6bxqw8,o e 6yates

  When a vapor condenseoi4t3w -,ae+m-x yqx is

  In a cloud formation, water vapor condenses into wat1j3avdo5. zqdq (kuz +er droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the cloudsd.voz +5aq(qjkd31zu to

  Turning up the flame 4rx)jh i3w*6y qtt7fiunder a pan of boiling water causes

  Equal masses of water at xp0vh). ivzbq.*0of(f u qi i6$20 \; ^{\circ}C$ 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 b;3 xw)bfzi+ser8a2dh* zopu3y means of molecular collisions is referred to a + s )faw3*ire;ubx3phzozd82s

  By what primary heat transfer mechanism does one end of an iron babcsm/(kaat( 6d d 9j8er become hot whet s( dd/acak98bjm (6en the other end is placed in a flame?

  On a cold day, a piece of metal feels muc h2j r,y6id*rrh colder to the touch than a piece of wood. This is due to the difference in which one of the following physical propertrrd 2hj,ir6y* y?

  If you double the thickness of a wvuxu4-.wj e+ocave:u,i 49tz all built from a homogeneous material, the rate of heat loss for a given temperature differeu4j,ozaw-. tci9v+veeu 4xu :nce across the thickness will

  A layer of insulating material with thermal conductivity K is placed odjn9my vhp j2j,: 2se+n a layer of another material of thermal conductivity 2K. The layers have equal thickness. jv2jd2 h+s9, pjn:mey What is the effective thermal conductivity of the composite sheet?

  The process whereby uzhsg /saqp*: t9i6e:rttf26heat flows by the mass movement of molecules from one place to s6arg9 e:piu*ttzh 2: /6fqstanother is referred to as

  By what primary heat transfer bmlmksu3( hsv82. y oly33* gymechanism is a pot of water heated on a stove?

  Convection can occurv -(hcgi48 we ns6)iie

  Which of the following best explains why sweating is important te 0eq5, ;sj bd5a.k/ifl lq(gco humans in maintaining /;0sabqqe df el.,kl5g(5ji csuitable body temperature?

  A spaceship is drifting in an environment where the a8busyhx5i h96aeb 0- is6u n2rcceleration of gravity is essentially zero. As the air on one side of the cabin is heated by an electric hea 9 50xssyru6-2h8hbabi6u einter, what is true about the convection currents caused by this heating?

  Consider two neighboring rectangular houses built frmy7u-1pqcm(e hs7;rfv : vb(tom 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 about the rate that heat would have to be supplied to maintain the same inside temperature on a cold day? Compared to the smahy((mf7 p 7 -bv; ve:1urmctsqll house, the larger house would need heat supplied at

  If the absolute temperature of a radiator is doubled, by what mb nqkbgy*8l/y,q3 r6factor does the radi/mgyq8b6n ,b yrl kq3*ating power change?

  The process whereby heat flows in the absence of any medium is referk,/gztb rx()xe;zvkv ,n7ui-red to as

  By what primary heat transfer mechanism does the Sun warm tew7*v,8 1 ijml nr8lz cs9qt*mhe Earth?

  1700 J of work is equivaj4:,o s. hfbqs; b+k1 4wckcrblent to how much heat?

  16.5 kcal of heat is equivaleb3f0uip3grm i :n u4-ent 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 lead 3at.ppin 59pw ($c = 0.11 \; kcal/kg \cdot ^{\circ}C$) by $15 \; ^{\circ}C$?

  If 40 kcal of heat is added to 2.0 kg of water, what is the resulting temperatur)r+ dp+ c)ixjqp ) q)xr+i+jcde change?

  A 4.0-kg aluminum block is originalwwc lu2u7 +0utly 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 kg of ,gib0-8++-pjyz gk )uqrrgbs/oqp ;n2p qd4jmaterial by $400 ^{\circ}F$. What is the material's specific heat capacity?

  A person tries to heat up her bath water byc hzyisryw2:2,u,1lz 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 k)p cl)3phz281/l2 qizwuas sn g of iron and 0.16 kg of copper. How much heat i p iz/hlsual8ws13zqcnp) 2)2 s added to the gear if the 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 heated to 8cwjvpr vg pp.3e(r0. $100 \; ^{\circ}C$ 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 atdv7 4t1lzuhx- qw *cj3 $95 \; ^{\circ}C$, 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 atn 1a:hg(gk3xu $100 \; ^{\circ}C$ 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 ntkoih8c;w.c)ba/ 9j .qdg gof8l7 z5system that is thermally isolated from its surroundings. Onkz ba. dj8gin/ ;97.g5hct f8)owc qole 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 Jou c8me7+lthgf s2q33ogle attempted to explore the relationships between various forms of enerc +sq 2ftmlo3g g7eh38gy 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 waterfall with a vertical drop of 20 m?

  The water flowing over Niagara Falls drops a distance of 50 m. Assuming.cruln2(e pe xq5pzr,* a:y- c that all the gravitational energy is converted to thermal energyynpc,c uxp e*el5q-r.( :2azr, by what temperature does the water rise?

  A 200-L electric water heater uses 2 kW. Assuming no heat lo88 0 bng q9t,qb1t+qwvan kk+kss, how long would it take to heat water in thiaqv +qq,nk1bt + kk8 t80ngw9bs 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 k1()ix q 8cilkq n2oh/20 kg of watni )l28k( o kqi1/qchxer from $20 \; ^{\circ}C$ to $100 \; ^{\circ}C$?

  An aluminum kettle (m .2 zhr,h,rjrhtqk1 6qass 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 b 9lroc 47km0yjlade (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 v2x :c5)r br2tpid*jt from steam to change it to liquid?

  Ice has a latent heat of fusion of 80 kcal/kg. How much heat is x ja qv bcc)e8z.j77+hrequired to melt 200 g of ea7xqjzcv87 c+)j. bh ice?

  How much heat energy is needed to change g1+ kh mphh(tiv4+.rj 10 kg of ice at $-20 \; ^{\circ}C$ to water at $50 \; ^{\circ}C$?

  How much heat needs to be rea4 /k qr3svx5pmoved from 100 g of $85 \; ^{\circ}C$ water to make $-5 \; ^{\circ}C$ ice?

  The heat of fusion of ice is 80 k980xbstw;x a/jr0 kfical/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 ini(8r 1qqrvo1.+ ajk kwetially 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 o4x 4pnvbw5r9g (r)d 3;ru ubpp0gm+m(v tbn( $0 \; ^{\circ}C$ is to be vaporized, how much heat must be added?

  How much heat energy is needed to change 10 96twtmgbqo7nf c 750j kg of water at $50 \; ^{\circ}C$ to steam at $120 \; ^{\circ}C$?

  How much heat is required to changebp q i/gerg0:g+2f q:l one gram of $0 \; ^{\circ}C$ ice to $120 \; ^{\circ}C$ steam?

  How much heat is req; 1e -yoff-xzx:ynhrv:js e)3uired to change 100 g of $-10 \; ^{\circ}C$ ice to $150 \; ^{\circ}C$ steam?

  A person makes ice tea (y o-n9-jy/b hgwuy2 5sr me y/g/xzz-by 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 of lead is 5.9 kcal/dqh 5c4hm-;hakg, and the heat of vaporization is 207 kcal/kg, and its melth -hc;4ha5qdm ing 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 concren nv:t +,ln*dste 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.6)ff, wz, )tlvo/z yuj Two rods (one aluminum and the other brass) are joined together end to end in excellent thermal contact. The rods are of equal lengths and radii. The free end of the bras)zlj,f6)o uyf w,z vt/s 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 dimenjbsbc+/uy -b7sions of 3.0 m by 1.5 m. If the outside temperatb+s c/7uybj- bure 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 o1c.vjyd+ cl,7no hq /rf 3.0 m by 1.5 m. If the outside temperatunhyc,r+vd . 7q oj/1clre 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 secti 8jkxo ; xshp1z22+2p vump+yrerq/3afwot)8on of concrete (kmjhefwzst3 xx1op+y28 2+r)/uva;o2q r pp 8$k = 2.0 \times 10^{-4} \; kcal/s \cdot m \cdot ^{\circ}C$) 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 th7a yz1g5 j bgg7hy8re)qr2d8ransfer 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 tempezk)pfbay4 6mi8q01 w zrature if 4000 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 steelnsd-h ,f26uet/qx: gez:r+yy , the temperature is monitored by measuring the radiant power emitted through a small hohgfendrx/ :-,sy +6:t2ezy uqle 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 energyxvr ox5653)fi stlo 2e 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 collev an pcup6tq3+h+af;am9,q4j ction 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.