Physics 110. Spring Exam #1. April 23, 2008

Transcription

1 hyc Spng 8 E # pl 3, 8 Ne Soluon Mulple Choce / oble # / 8 oble # / oble #3 / 8 ol / In keepng wh he Unon College polcy on cdec honey, ued h you wll nehe ccep no pode unuhozed nce n he copleon o h wok.

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3 I: ee Repone oble lee how ll wok n ode o ecee pl ced. I you oluon e llegble no ced wll be gen. lee ue he bck o he pge necey, bu nube he poble you e wokng on.. he Le Show ho, Dd Leen, lke o he people peo oe un o ge on V. Suppoe h Leen h peon nd on op o he Ed Sulln hee (whee he Le Show ped) nd how bll buldng ne doo. I he peon how he bll. / (gnong ny con) n ngle o o wh epec o he ecl, nd h he neghbong buldng wy.. h e he - nd y-coponen o he nl elocy? y coθ nθ co5 5. n 5 8. b. How boe o below he peon poon (on he ooop) doe he bll h? y y o oy y o (.6).9 (.6).7 c. h he nl elocy o he bll ju beoe ke he buldng? y y 5. g 8. y θ n y (.6) 7. θ.8 d. h he cceleon o he bll ju beoe ke he buldng? he cceleon due o gy nd h lue o 9.8 / n he eclly downwd decon.

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5 . Suppoe h een cc Boeng 737 (hown below) on he unwy o lbny Inenonl po wng o keo clence. hen gen clence, he plo pple ull powe o he plne engne nd ccelee conn e o / down he unwy.. I he plne ke o when elocy eche 65 /h (whch kno o nucl le pe hou) nd no beoe, wh he nu e beoe he plne cn ke o? (Hn: k.6 nd h 36.) ; o 73.9 wh 37.. nd 65 h 73.9, b. How down he unwy doe he plne el beoe ke o? ( )( 37) k c. Suppoe h e.5 k he plo decde h keo no e nd decde o op he plne. I he hu eee (on he engne) e engged nd he bke e ppled, he plne epeence oce h bng o e n k. h he gnude o h oce he plne h o 87, kg nd he plne elng 65 /h when he bke nd eee e ppled? he oce: ( ) ( 73.9 ) ( ).73 5 ( 87,kg)(.73 ) 7.8 N.

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7 3. he hun body cpble o unng he lge oce whou dc njuy. Conde, o eple, n uooble ccden n whch n nlble ey dece (n bg) uddenly nd quckly nled.. Dw dg o h uon lbelng only he oce h c on he bg (once ully nled) nd on you body. h cn you conclude bou he oce o you hed on he bg nd he oce o he bg on you hed? body,bg bg,body he oce e equl n gnude nd oppoe n decon by Newon 3 d lw. b. Dee n epeon o he oce o he bg on you body ung h you wee nlly elng n nl peed o nd wee bough o e oe dnce. c. I you body (o 7 kg) coe o e oe dnce o 3 c nd you nl peed w 9.6 / (~ ph), wh he gnude o he oce h he bg eeed on you body? ( 9.6 ) 7kg.3.8 N.5 N c. hee pobbly h he bg could gge nd nle whle he c n oon nd hee w no ccden ll. h could p he on o he de nd hence he bg degned o epnd nd collpe oe ey ho e nel. Gen he noon boe, how long would ke he bg o dele he nlon w lo nnneouly nd ung h he bg ully deled oon he uooble bough o e? ( ) 7kg N.3.8 O, nong h when olng he qudc equon, he que oo e zeo!

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9 II: Mulple-Choce Ccle you be nwe o ech queon. ny ohe k wll no be gen ced. Ech ulple-choce queon woh pon o ol o pon.. o he dg below, he block o pulled o he gh conn peed by n ppled oce oened n ngle θ boe he hozonl, he gnude o he conl oce gen by. nθ b. coθ c. g d. N. Suppoe h oquo le hed-on no n oncong c nd dung he collon he oquo ee oce on he c. he oce h he c ee on he oquo. zeo. b.. c. le hn. d. gee hn. 3. bebll dond que wh de 9 ee n lengh. kng hoe ple o be he poe - nd he y- o hoe ple o 3 d be, he dplceen o unne how h double. 9 b. 8 c. 9.5 d. 7. You nd end nd on now coeed oo. You boh how nowbll wh he e nl peed, bu n deen decon. You how you nowbll downwd, o below he hozonl; you end how he nowbll, o boe he hozonl. hen he nowbll lnd on he gound, he peed (he gnude o he elocy) o you nowbll coped o you end

10 . he e. b. gee. c. le. d. unble o be deened. 5. lon o weghed by hngng o cle ched o he celng o n eleo whle he eleo e nd he wegh ound o be g. I he eleo cceleng downwd e o, he edng on he cle would be. N g. b. N g. c. N g. d. N g. 6. You dop ock o bdge no oe we below. hen he ock h llen, you dop nd ock. he ock connue he ee ll, he epon. ncee. b. decee. c. y he e. d. cnno be deened nce no enough noon gen o nwe. 7. I n objec el n he poe -decon 75 oe 36 econd nd he un ound nd el n he nege -decon 75 o 7 econd, he ege elocy. / b / c. 5 / d. 5 / 8. I he -coponen o he elocy o n objec pled eey 5 econd nd ploed, ound h he eul ncee lnely n e. hch gph below be epeen he ne oce on he pcle uncon o e?

11 9. Soee nge quoe e bued o ou people. Hee one eple o one uppoedly ueed by lbe Enen: Gon cnno be held eponble o people llng n loe. Could h be ue? h he gonl con beween wo people ech wh 7 kg h e eped by.5?..9 5 N b N c..9-7 N d N. Suppoe h you he cng nd h he blood n he o cceleed by he con o he he beng h pce nd hu chnge he elocy o / o.5 / oe dnce o.. h he cceleon o he blood?..5 / b. 6.3 / c. 9.8 / d /

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13 Ueul oul: Moon n he, y o z-decon Uno Ccul Moon Geoey /lgeb G G c b b by gen e oluon whoe c b equon Qudc V bh C Sphee ngle Ccle :, : 3 3 ± Veco Ueul Conn ound K K J B ole o kg N k N G g σ y y eco decono eco o gnude n φ Lne Moenu/oce ok/enegy He R R ne R R N S g E E E E dco k U k gh U I K p p K p τθ θ µ [ ] ( ) ( ) ( ) Q U Q L k Q c Q k Nk V V V L L R C B B old new old new old new C C : 3 3 εσ β β Roonl Moon lud Sple Honc Moon/e : : θ τ θ θ θ I L I gh gh gv gd V M B d L n n g l k n S ± µ λ