2015 Sectional Physics Exam Solution Set

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1 . Crrec answer: D Ne: [quan] denes: uns quan WYSE cadec Challenge 05 Secnal Phscs Ea SOLUTION SET / / / / rce lengh lengh rce enu ass lengh e a) / ass ass b) energ c) wrk lengh e pwer energ e d) (crrec answer) energ energ e e) enu ass lengh e e rce a ass lengh e energ rce. Crrec answer: Usng wrk = change n energ he chld-earh sse: W E E rcn, ss, ss GPE KE GPE KE g g g 0 g 0. kg.67 /s -. kg 9.80 /s.6-4 J agnude 4 J. kg Inall a res /s. Crrec answer: The au pssble sac rcn s 4.0 N. N sac s F N 4.0N F rcn =? 60.0 N 8.0 N Snce he appled rce s less han 4.0 N, he bjec wll rean a res wh he rcnal rce equal and ppse he appled rce 8.0 N. sac 8.0N

2 4. Crrec answer: E Snce he appled rce s greaer han he au sac rcn 4.0 N, he bjec wll be ng, and herere subjec knec rcn. The bjec wll accelerae accrdng Newn s nd Law. 0 Fne a Fne Fappled knf.40 s 44.0N N 60.0 / 9.80 kg 7.84/s 5. Crrec answer: F (N) Wrk (= area under a F s. graph) = change n energ..00 /s K. E. =? F () F () 5.00 kg 5.00 kg () rea r J N N N rear J Energ KE KE KE 5.00kg.00/s KE 4.00J 6. Crrec answer: E Onl he ass nsde he radal lcan he bjec cnrbues a ne graanal rce. The ass usde he bjec s radal lcan eers a ne zer rce. See a reshan cllege phscs e r a ull eplanan. Wha ne graanal rce des hs shell aer eer n? Maer nsde s lcan des eer a ne graanal rce n. 7. Crrec answer: D ssgn he nal psn he ball be ( = 0.00, = 5.80 ) p,, p a 0 7.0/s 9.80/s 5.80 p 8.5

3 8. Crrec answer: C b,, b a 7.0/s 9.80/s b, /s b b, b, 8.50/s /s Speed 5.5/s 9. Crrec answer: C Fne a.5 T dwn g dwn dwn 4.50/s T g.80kg 9.80/s.9N /s.80 kg Crd ensn? ed gra 0. Crrec answer: E The enu he an-b sse s cnsered. Inall h:.40 /s erward elc? 9.0 /s 68 lb an 5.00 lb b 68 lb an 5.00 lb b an an, b b, an an, b b, 68 lb 5.00 lb 68 lb 5.00 lb an, g g g g.40 /s E.40 /s E 9.0 /s E 45. lb /s E 68 lb 95.0 lb /s E an,.9 /s E an,. Crrec answer: Snce n wrk s dne n he sse, he energ he sse s cnsered. Inall h a res, Sprng cpressn: erward Sprng cpressn: 0 speed? nd snce n ne eernal pulse acs upn he sse, enu s als cnsered. nal enu = nal enu M M0 /s M M M M M M M M nal energ = nal energ k M M 6 k M M M k 6M

4 . Crrec answer: ag ag s rad/s. Crrec answer: D Pal.00 a gh 5 N kg /s N a a 5 N Crrec answer: D Pung a 85 kg ba abe he pn n quesn wuld n change he pressure 6.00 belw he surace he lake snce he ba dsplaces an equalen ass (and wegh) waer. 85 kg 85 kg = 0 5. Crrec answer: L L and L L T P Srng L kn Srng L L T L L T T 9.5 4

5 6. Crrec answer: C Q Q Q Q al ce(-0) ce(0) ce(0) waer(0) waer(0) waer (0) 0 0 C 0 C 0 c L c ce ce ce waer waer kgc kg kgc J J J 0.kg 09 0 C 0.kg kg C V 4.0 V 4865 J Pelecrcal s 7. Crrec answer: E T sn g q T cs k g an kq q g C.65 0 C kan an q.08 0 C 08 nc 9 F elec gra T 86.8 q q g 8. Crrec answer: KE c c c c c 4 c 4c c c c c c c Crrec answer: D Newn s Frs Law saes ha a bd n aced n b an rces es wh cnsan elc. 0. Crrec answer: s s. /s

6 . Crrec answer: s 0.0 s a a 0.48 /s. Crrec answer: D r F sn rf sn Nsn Nsn N. Crrec answer: D Usng he cnenn ha pse rque s cunerclckwse and negae rque s clckwse: 0 rf sn rf sn Nsn N Nsn N 40.0 Nsn N sn 65.0 sn 65.0 sn N 0.0 N Crrec answer: E I n eernal rces ac n a sse, he al enu he sse s alwas cnsered. 5. Crrec answer: D The daeer a able enns ball s 4.0 c. V r Crrec answer: E K U U 0 g h h k k 0 gra sprng kg9.80 /s 6.00 c.00 c 4.00 c g h h k 9.4 N/c 7. Crrec answer: K K U 0 ranlanal ranal r gran r gran g h h 0 llng whu slppng ples : g h h 9.80 /s rgrae.0 c 5.0 c.50 sn /s 8. Crrec answer: C Usng a crdnae sse wh he drecn ward he eas and he drecn ward he nrh: 4.00, 0.00,.00, 4.00.

7 , , arcan arcan 6.9 N E 9. Crrec answer: s bh blcks rean n cnac, Newn s Secnd Law can be sled r he cbned sse: F F ala a al Slng Newn s Secnd Law r he.00 kg blck alne r he unknwn cnac rce: F F Fcnac.00kga.00kg.00 kg F al 7.00 kg 4.00 kg 0. Crrec answer: C W W gh 50.0 kg9.80 / s 4.00 P 9.80 s P P 00. W. Crrec answer: The sable renan r lang s when he cener ass he lang bjec s as lw as pssble. I s eas er ha when c hs blck s belw he waer, he cener ass s lwes when he shres densn s ercall rened. n bjec las when he wegh he dsplaced lud s equal he wegh he bjec: gv gv bjec bjec bjec lud lud V V dsplaced bjec dsplaced.50 kg/ c.00 c.00 c.00 c.00 c.00 c kg/. Crrec answer: V The elecrc eld s E. The V s he sae beween each par cures s he elecrc s eld agnude wll be he greaes where he cures are clses geher (salles s ).. Crrec answer: The equalen ressance he 0.0 and he 0.0 ressrs n parallel s eq esulng n he equalen crcu: V The equalen ressance he 8.0 and he.0 ressrs n seres s eq esulng n he equalen crcu: 50 V Usng Oh s Law, he curren ha lws n hs crcu s

8 I V 50. V Ths curren s he curren ha lws r he lage surce whch s n he sae branch as he 8.0 ressr he rgnal crcu. 4. Crrec answer: d d d d dd d d d and d d c c 5. Crrec answer: F One a reach he answer b knwng F q sn. q sn N N s Subsung uns r each quan n he rgh: uns C/s C

2010 Sectional Physics Solution Set

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