practicemidterm2

practicemidterm2 - PracticeMidterm2Physics6AWinter2008 1.

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Unformatted text preview: PracticeMidterm2Physics6AWinter2008 1. Inthefigurebelow,whatisthetensioninropeA? a. 127Nb.146N c.253N d.317N 2. Apersonwithw=600NisridingonaFerrisWheelwithR=20m.The FerrisWheelisrotatingwithacircularspeedofvc=12m/s.Whatisthe normalforcethattheseatexertsonthepersonatthebottomofthecircle? a. 4920N b.440N c.1640N d.1040N 3. Aboxonacarpetonahorizontalsurfacehasacoefficientofstaticfrictions =0.23.Iftheboxhasaweightofw=300N,whathorizontalforcedoyou needtopushittogetittostartmoving? a. 300N b.7.0N c.1304N d.69N 4. SantaBarbaragotafreaksnowstorm,soyouareiceskatingtoclass.You skidtoastoponalevelpatchoficeint=12sfromaninitialspeedofvi=7.5 m/s.Whatwasthecoefficientofkineticfriction,kbetweenyouandtheice? a. 0.064 b.15.7 c.0.16 d.6.12 5. Aspringwithspringconstantk=23.1N/mishungvertically.Ifyouhanga weightofmass5kgfromit,howfardoesthespringstretch? a. 2.12m b.0.216m c.4.62m d.0.476m 6. Youspinaballofmass1.5kgattheendofa35cmlongstringinahorizontal circle.ThestringhastensionT0.Ifyoutriplethecircularvelocityoftheball, whatisthenewtensioninthestring,intermsofT0? a. 3T0 b.9T0 c.(9/2)T0 d.(1/9)T0 7. Ifyouarestandingonthesurfaceoftheearth,whichisgreater:the gravitationalforcethattheearthexertsonyou,orthegravitationalforcethat youexertontheearth? a. TheFgtheearthexertsonyou b.TheFgyouexertontheearth c.Theyarethesame. 8. Youareorbitingtheearthinaspacecraftatavelocityofvc=3km/s.Howfar mustyoubeabovetheearth'ssurface? a. 3.79x107m b.4.43x107mc.1.33x1011md.6.7x105m 9. Thependulumbelowisdrawnatthehighestpointinitsswing,whereitisat a30angletothevertical.Thelengthofthependulumis1.6m,andthemass oftheweightattheendis6kg.Whatisitsvelocityatthelowestpointinits swing? 4.12m/s a.3.96m/sb. 0.66m/s c.2.03m/s d. d.Notenoughinformationtosay 10.Apersonpushingonablockofmass16kgonahorizontalsurface acceleratesitfrom2.0m/sto9.0m/sint=8s.Whatistheaveragepower neededtodothis? a.77W b.616W c.107W d.435W 11. Youareleapinguptoblockaspikeonthevolleyballcourt.Ifyouweigh550 N,andyoupushdownonthefloorwithaforceofF=1000N,whatisyour accelerationup? a. 12.7m/s2 b.27.6m/s2 c.17.8m/s2 d.8.0m/s2 ...
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