UNIVERSITY OF SASKATCHEWAN Department of Physics and Engineering Physics

Transcription

1 UNIVERSITY OF SASKATCHEWAN Deprtent o hysics nd Engineering hysics Ssktchewn High School hysics Scholrship Copetition My 3, 006 Tie: 90 inutes This copetition is bsed on the Ssktchewn High School hysics Core Curriculu or hysics 0 nd hysics 30. INSTRUCTIONS: 1. You should he test pper nd n OMR (Opticl Mchine Redble) or Coputer scn sheet. The test pper consists o 9 pges. The student should check tht the test pper is coplete.. Enter your ne nd school on the OMR sheet. 3. Enter your personl inortion on the tble below. 4. At the end o the exintion both this coer pge nd the OMR sheet ust be subitted. 5. All questions re o equl lue. 6. No rks will be deducted or wrong nswers. 7. Clcultors y not be used. (None o the questions require the use o clcultor.) LEASE RINT THE FOLLOWING INFORMATION Ne: School: hysics Techer: Hoe Address: ostl Code: Telephone: ge 1 o 9

2 My 3, 006; ge FOR EACH OF THE FOLLOWING UESTIONS ENTER THE MOST ARORIATE RESONSE ON THE OMR SHEET. Note: In ll the questions the sybol g denotes the gnitude o the ccelertion due to grity on the Erth s surce. 1. Which one o the ollowing nubers is correctly expressed in scientiic nottion to 4 signiicnt igures s k kg /s s. The digr shows snpshot o we t n instnt in tie. This we hs plitude nd welength. plitude 1 nd welength. plitude nd welength 3. plitude nd welength 6. plitude 1 nd welength A string is stretched with ixed tension in it. When one end o the string is wiggled t requency, the we tht trels down the string hs speed nd welength λ. I insted the end o the string is wiggled with requency the we tht trels down the string will he speed nd welength λ. speed nd welength λ. speed nd welength ½λ. speed nd welength ½λ. speed ½ nd welength λ. 4. Which o the ollowing lists electrognetic wes ro longest welength to shortest welength? X-ry, ultriolet, isible light. isible light, ultriolet, icrowes. Inrred, isible light, X-rys. rdio wes, X-rys, isible light. ultriolet, isible light, inrred. 6 ge o 9

3 My 3, 006; ge 3 5. The digr on the right shows two we pulses oing towrd ech other in string t one instnt in tie. Which o the ollowing digrs best represents the shpe o the string t lter instnt in tie when the two we pulses re both between points nd? None o the boe 6. A cndle is plced on the principl xis o conce (conerging) irror t distnce o 10 c ro the irror. The ocl length o the irror is 0 c. The ige o the cndle ored by the irror will be rel, upright nd enlrged. rel, inerted nd enlrged. rel, inerted nd sller. irtul, upright nd enlrged. irtul, upright nd sller. 7. At quiet pond with crystl cler wter, you decide to ish with bow nd rrow. You see ish under the wter. Where should you i your rrow? Directly t the point where you see the ish. At point closer to the surce thn where you see the ish. At point deeper in the wter thn where you see the ish. At point tht depends on the depth o the pond. 8. I glss lens is suberged in wter, wht hppens to the ocl length o the lens? (The index o rerction o glss is lrger thn the index o rerction o wter.) Its gnitude increses. It stys the se. Its gnitude decreses. It chnges sign. Its gnitude increses or decreses depending on whether the lens is conerging lens or dierging lens. ge 3 o 9

4 My 3, 006; ge 4 9. The index o rerction o diond is.4. This ens tht light o gien colour hs speed in diond tht is.4 ties ster thn in cuu, nd welength in diond tht is.4 ties longer thn in cuu. speed in diond tht is.4 ties ster thn in cuu, nd welength in cuu tht is.4 ties longer thn in diond. speed in cuu tht is.4 ties ster thn in diond, nd welength in diond tht is.4 ties longer thn in cuu. speed in cuu tht is.4 ties ster thn in diond, nd welength in cuu tht is.4 ties longer thn in diond. speed in diond tht is the se s in cuu, nd welength in cuu tht is.4 ties longer thn in diond. 10. The criticl ngle or be o light pssing ro wter into ir is This ens tht light trelling in the wter nd striking the wter-ir interce t n ngle o incidence less thn 48.8 will ll be relected. will ll be trnsitted. will be prtilly trnsitted nd prtilly relected. will be bsorbed so tht no light is trnsitted or relected. will chnge colour. 11. A therlly isolted syste initilly contins hot piece o copper nd cold piece o luinu. The copper nd the luinu re llowed to coe into therl contct with ech other. The speciic het cpcity o luinu is ore thn double tht o copper. Which object experiences the greter gnitude gin or loss o het during the tie it tkes or the syste to coe to therl equilibriu? The luiniu. The copper. Neither, both experience the se size gin or loss o het. The object whose initil teperture ws urthest wy ro the inl teperture o the syste. The nswer cnnot be deterined without knowing the sses o the objects. 1. A hole is drilled in etl plte. When the plte is heted, wht hppens to the dieter o the hole? It increses. It decreses. It reins the se. It y increse or decrese depending on the reltie sizes o the plte nd the hole. It y increse or decrese depending on how st the plte is heted. ge 4 o 9

5 My 3, 006; ge The ir in roo consists principlly o nitrogen nd oxygen. The oleculr weight o nitrogen (N ) is 8 g/ole nd the oleculr weight o oxygen (O ) is 3 g/ole. The ir is in therl equilibriu. Which stteent is true? The erge speeds o the nitrogen nd oxygen olecules re equl. The erge kinetic energies o the nitrogen nd oxygen olecules re equl. The oxygen olecules he erge speeds tht re greter thn or the nitrogen olecules. The nitrogen olecules he erge kinetic energies tht re greter thn or the oxygen olecules. None o the boe stteents re true. 14. Vectors M nd N stisy the eqution M + N = 0. Which one o the ollowing stteents ust be correct? Vectors M nd N re t right ngles to ech other. Vectors M nd N point in the se direction. Vector M = 0 nd ector N = 0. Vectors M nd N he the se gnitudes. The gnitude o M is the negtie o the gnitude o N. 15. A won out or n ternoon stroll strts t the corner o Brodwy Aenue nd Min Street. On the irst leg o her journey she wlks 1 k due north. On the second leg o her journey she wlks long seerl streets eentully ending up t point tht is 1 k due Est o her strting point. The displceent ector or the second leg o her wlk is best described s k, North o Est. N k, North o West. k, South o West. k, South o Est. 1 k, Est 16. A trin is initilly oing orwrd long stright trck t speed 0. The brkes re pplied nd t tie t lter the trin is distnce d ro where the brkes were pplied nd it is oing t speed. Assuing it is constnt, the ccelertion,, o the trin during this tie interl t is 0 = d 0 = t + 0 = t 0 = t 0 = d W S E ge 5 o 9

6 My 3, 006; ge This question nd the ollowing question reer to the grph t right which shows the displceent o bsketbll plyer s unction o tie s he runs up nd down the court long north-south line. (x = 0 is t the centre line nd +x is towrd the north.) Wht is the erge elocity o the bsketbll plyer during the tie interl ro tie t = 1 s to tie t = 6 s? 3 /s 1 /s /s /s /s x () Wht is the pproxite instntneous elocity o the bsketbll plyer t tie t = 4 s? zero. +3 /s +1 /s + ¾ /s.5 /s 19. A stone is thrown erticlly upwrd on the surce o the Moon (no tosphere). During the stone s light, beore it reches its xiu height, its ccelertion is upwrd. its ccelertion is zero. the stone is in equilibriu. the net orce on the stone is downwrd. the ccelertion is decresing nd will becoe zero when the stone reches its xiu height boe the Moon s surce. 0. A gondol cr, o ss, is teporrily sttionry nd suspended t the hlwy point between two supports. The cble sgs t n ngle θ below the horizontl s shown. Ignoring the ss o the cble, the tension in the cble is g cosθ g cosθ g sinθ g sinθ g sinθ θ θ t (s) ge 6 o 9

7 My 3, 006; ge 7 1. The se net horizontl orce is pplied to seerl objects o dierent ss. Which one o the ollowing grphs o the resulting ccelertion plotted s unction o ss is the expected result o this experient?. A block o ss is t rest on n inclined plne tht kes n ngle θ with the horizontl. The gnitude o the orce o sttic riction s between the block nd the plne ust be such tht s > g θ s > g cosθ s = g cosθ s = g sinθ None o the boe: We need to know the coeicient o sttic riction between the block nd the plne to gie n nswer. 3. An eletor, supported only by steel cble, is descending t constnt speed. Ignoring ir resistnce, the tension in the cble is equl to the weight o the eletor nd its occupnts. greter thn the weight o the eletor nd its occupnts. less thn the weight o the eletor nd its occupnts. zero y be ny o the boe nswers depending on the speed. ge 7 o 9

8 My 3, 006; ge 8 4. Two blocks with sses 1 nd, with 1 >, re on horizontl rictionless surce so tht they re in contct with ech other s shown. A horizontl orce is pplied ro either the let or the right. The gnitudes o the orces re the se so tht the result is horizontl ccelertion o the two blocks to the right or to the let. The gnitude o the contct orce between the blocks 1 nd is F let 1 1 F right lrger when the orce is ro the right. lrger when the orce is ro the let. the se in both cses. ipossible to deterine ro the inortion gien. 5. A truck hs two ties the ss o cr, howeer the cr is oing with twice the speed o the truck. I K t nd K c re the kinetic energies o the truck nd the cr respectiely, it is correct to sy tht K t = K c. K t = K c. K t = K c. 4K t = K c. K t = 4K c. 6. Swiers t wter prk he choice between two rictionless wter slides (see igure). Although both slides drop oer the se height h, slide 1 is stright while slide is cured, dropping quickly t irst nd then leelling out. Assuing the swiers strt ro rest t the top o the slides, how does the speed 1 o swier reching the end o slide 1 copre to the speed o swier reching the end o slide? Slide 1 Slide h 1 h 1 = 1 > 1 < There is no siple reltionship between 1 nd. The nswer depends on the reltie sses o the swiers. 7. A book, o ss, is lited up ro the loor distnce h, then trnsported horizontlly distnce x, then lowered distnce d to inlly be resting on tble top. The work done by the orce o grity on the book during this otion is +g(h + x + d) +g(h d) g ( h d) + x g(h + x + d) g(h d) ge 8 o 9

9 My 3, 006; ge 9 8. A length o copper wire hs resistnce R. I the wire is replced with nother copper wire with twice the length nd twice the rdius, wht is the resistnce o the new copper wire? ¼ R ½ R R R 4 R 9. This question nd the ollowing one reer to the circuit pictured. The 1 V bttery y be considered to be idel. Wht is the current pssing through the 6 Ω resistor? 1 A A 4 A 0.5 A 0.5 A 30. Wht is the power being supplied by the bttery? 1 W 4 W 36 W 48 W 144 W END OF EXAMINATION Ω 4 Ω 6 Ω 1 V ge 9 o 9