QUESTIONS ON HEAT AND TEMPERATURE

Size: px

Start display at page:

Download "QUESTIONS ON HEAT AND TEMPERATURE"

Valentine Anderson
7 years ago
Views:

1 QUESIONS ON HE ND EMPERURE Dirctions: Put your na on th answr sht rovidd. nswr all qustions on th answr sht. Qustions 1 through 4 rfr to two cus, and, which contain diffrnt aounts of watr. h watr in ach cu is hatd as dscribd. In qustions 1 through 3 th cus ar in a roo whr th tratur is 25 C. In qustion 4 th cus ar in diffrnt nvironnts. For ach qustion choos on of th four answrs through D. ) Cu had or hat nrgy transfrrd ) Cu had or hat nrgy transfrrd C) oth cus had th sa aount of hat nrgy transfrrd D) not nough inforation is givn to dtrin th answr 1. Cu contains ras of watr and cu contains twic as uch watr. h watr in both cus was initially at roo tratur. Cu was hatd to 75 C and cu was hatd to 50 C. Which cu had or hat nrgy transfrrd to it? Roo ratur 200 g 75 C 25 C 50 C 2. Cu contains ras of watr and cu contains 50 gras of watr. h watr in both cus was initially at roo tratur. Cu was thn hatd to 45 C and cu was hatd to 90 C. Which cu had or hat nrgy transfrrd to it? Roo ratur 25 C 50 g 45 C 90 C 3. Cu contains ras of watr and cu contains 80 gras of watr. h watr in both cus was initially at roo tratur. Cu was thn hatd to 45 C and cu was hatd to 50 C. Which cu had or hat nrgy transfrrd to it? Roo ratur 25 C 80 g 45 C 50 C 4. Cu contains ras of watr and is initially at 10 C in a rfrigrator. Cu is hatd until its tratur is 20 C. Cu contains 50 gras of watr initially at 70 C in an ovn. Cu is hatd until its tratur is 90 C. Which cu had or hat nrgy transfrrd to it? Rfrigrator ratur 10 C 20 C 50 g 90 C Ovn ratur 70 C Hat and ratur Conctual Evaluation Q-1 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

2 Qustions 5-7 rfr to two idntical cus, and, ach containing ras of watr. h cus ar in a roo whr th tratur is 25 C. h watr in cu is initially at 55 C, whil that in cu is initially at 40 C. Roo ratur 55 C 25 C 40 C Initially, which cu will cool down at a fastr rat? ) will cool fastr ) will cool fastr C) thy both will cool at th sa rat D) not nough inforation is givn to dtrin th answr Which cu will rach its final tratur ost quickly? ) Cu ) Cu C) oth tak th sa ti D) not nough inforation is givn to dtrin th answr Which of th following grahs bst rrsnts th sha of th grah of th tratur of cu ovr ti? nswr H if you think that non is corrct. (Not that th origin dos not ncssarily rrsnt 0 C) ) ) C) i i i D) E) F) i i i 8. Cu contains ras of watr at 0 C and cu contains ras of watr at 50 C. h contnts of th two cus ar ixd togthr in an insulatd containr (no hat can transfr in or out). h final tratur of th watr in th containr is ) Lowr than 0 C E) twn 25 C and 50 C ) 0 C F) 50 C C) btwn 0 C and 25 C G) Highr than 50 C D) 25 C 9. Cu again contains ras of watr at 0 C but cu now contains 200 gras of watr at 50 C. h contnts of th two cus ar ixd togthr in an insulatd containr (no hat can transfr in or out). h final tratur of th watr in th containr is ) Lowr than 0 C E) twn 25 C and 50 C ) 0 C F) 50 C C) btwn 0 C and 25 C G) Highr than 50 C D) 25 C Hat and ratur Conctual Evaluation Q-2 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

3 Roo ratur 45 C 25 C 35 C Sall coff cu hatrs ar lacd in cus and and hat is transfrrd to k th cus at th traturs shown. h cus contain th sa aount of watr. Which answr bst dscribs th rat that hat ust b transfrrd to aintain th traturs shown? Cu will rquir hat at ) about fiv tis th rat of ) about twic th rat of C) a slightly fastr rat than oth cus will rquir hat at D) th sa rat Cu will rquir hat at E) about fiv tis th rat of F) about twic th rat of G) a slightly fastr rat than H) Non of th abov answrs is corrct Cu in th rvious qustion is lacd outsid whr th tratur is 5 C. Coar th rat at which hat ust b transfrrd to k th watr at 45 C outdoors to th rat rquird to k th watr at 45 C insid th roo. (Pick on of th choics -H blow.) Whn th cu is outsid, or hat ust b transfrrd ) at about fiv tis th rat as insid ) at about twic th rat as insid C) at a slightly fastr rat than insid D) Hat ust b transfrrd at th sa rat outsid and insid Whn th cu is insid, or hat ust b transfrrd E) at about fiv tis th rat as outsid F) at about twic th rat as outsid G) at a slightly fastr rat than outsid H) Non of th abov answrs is corrct 12. hr objcts ar kt outsid for a long ti on a cold day: a ic of cotton, a ic of wood and a ic of tal. Which objct fls th coldst whn you touch it? ) h cotton ) h wood C) h tal D) hy all fl th sa 13. Which of th objcts abov would hav th lowst tratur? ) h cotton ) h wood C) h tal D) hy ar all th sa tratur Hat and ratur Conctual Evaluation Q-3 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

4 14. h objcts in qustions12 and13 ar lacd in an ovn hatd to 90 C and lft for a long ti. Which objct will fl warst whn you touch it? ) h cotton ) h wood C) h tal D) hy all fl th sa 15. Which of th objcts abov would hav th highst tratur? ) h cotton ) h wood C) h tal D) hy ar all th sa tratur Qustions rfr to a cu which contains watr at roo tratur. h cu is rfctly insulatd so that no hat can transfr into or out of th cu. sall coff cu hatr insid th cu is usd to transfr hat to th watr. h watr dos not boil. 16. If hat is transfrrd to th cu at a stady rat, which of th grahs blow bst rrsnts th sha of th grah of th tratur of th watr ovr ti as th hat is transfrrd? nswr H if you think that non is corrct. ) ) C) D) i E) i F) i i i i Each of th qustions dscribs a chang in th situation dscribd in qustion 16 (a hatr in watr in a rfctly insulatd cu). For ach qustion, choos th answr that bst dscribs th tratur ris du to th chang dscribd. h tratur ris would b ) four tis as larg. ) two tis as larg. C) th sa. D) half as larg. E) on quartr as larg. H) Non of th abov answrs is corrct hr is th sa aount of watr and twic th aount of hat is transfrrd. hr is half as uch watr and th sa aount of hat is transfrrd. h watr is rlacd by an qual ass of a liquid with half th scific hat caacity of watr. h sa aount of hat is transfrrd. Hat and ratur Conctual Evaluation Q-4 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

5 Qustions rfr to th sa cu and hatr dscribd abov but th cu initially contains a ixtur of 50 gras of ic and 50 gras of watr at 0 C. h cu is rfctly insulatd so that no hat can transfr in or out. Roo tratur is 25 C. sall coff cu hatr insid th cu allows hat to b transfrrd to th ic and watr ixtur. Hat is transfrrd at a stady rat and th ixtur is stirrd continuously so that th tratur is always unifor throughout th ixtur. For ach qustion blow, choos th sha of th tratur-ti grah fro th grahs through F on th rvious ag that bst corrsond to th tratur of th ixtur during th ti intrval dscribd. If you think no grah is aroriat, writ H. (You ay choos a grah or than onc. h origin of th grahs dos not ncssarily rrsnt 0 C.) Which grah could show a ti intrval whn th ic is lting but thr is still so ic in th watr? Which grah could show a ti intrval whn thr is still so ic at th bginning of th ti intrval, but all th ic disaars bfor th nd of th intrval? Which grah could show a ti intrval whn thr is only watr (th ic is coltly ltd bfor th ti intrval bgins), but no boiling occurs during th intrval? Which grah could show a ti intrval whn th watr is boiling during th ntir ti shown by th grah? 24. sall aount of watr in a tal containr is at 80 C. h watr is lft to cool in a roo whr th air tratur is 20 C. Draw a grah that rrsnts tratur vs ti for th tratur of th watr. h sa watr in a tal containr again at 80 C is ut into a watr bath at 20 C. How will th cooling curv chang if it is diffrnt? Dscrib in words and draw anothr curv on th axis blow. (If you think th curv is idntical, say so. Othrwis labl th nw curv as "in watr" on th answr sht) ginning. Roo. ( o C ) i (sc) 25. hr ar thr ots of boiling watr on th stov. Which on has th lowst tratur? ) h on that is boiling vigorously ) h on that has bn boiling for th longst ti C) h on that is just barly boiling D) hy all hav th sa tratur Hat and ratur Conctual Evaluation Q-5 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

6 Qustions 26 to 28 rfr to th six idntical rods blow (ll ar ad of th sa tal and th rods hav th sa sha). h traturs at ach nd of th rods ar indicatd. h sids of th rods ar insulatd so that no hat can flow in or out. 0 C 50 C 20 C 90 C -10 C C 30 C 60 C D 110 C 0 C E 60 C 30 C F 60 C long which rod dos hat flow at th slowst rat? nswr G if you think that hat flows at th sa rat along all of th rods. long which rod dos hat flow at th fastst rat? nswr G if you think that hat flows at th sa rat along all of th rods. long which rod is th rat of hat flow th sa as along rod? nswr G if you think that hat flows at th sa rat along all of th rods. nswr H if you think that no rod has th sa rat of hat flow as. Hat and ratur Conctual Evaluation Q-6 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

7 QUESIONS ON HE ND EMPERURE NSWER SHEE Na Class, Lab Sction Dat ginning. Roo. ( o C ) i (sc) Hat and ratur Conctual Evaluation Q-1 Hat and ratur 5/8/01 ools for Scintific hinking, CSM, ufts U. R.K. hornton & D.S. Sokoloff his docunt is intndd for us with high school studnts as st forth in th HSCD Sit Licns.

Financial Mathematics

Financial Mathematics Financial Mathatics A ractical Guid for Actuaris and othr Businss rofssionals B Chris Ruckan, FSA & Jo Francis, FSA, CFA ublishd b B rofssional Education Solutions to practic qustions Chaptr 7 Solution