physics i example exam and solutions

7/27/2019 Physics I Example Exam and Solutions

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1 . This is to identify the exam version you have- IMPORTANTMark the A2. This is to identify the exam version you have- IMPORTANTMark the B3 .n(If the only forcesactingon a 2.0-kgmassare F, = (3i - 8j) N and F, = (5i + 3j) N, what isthe mamitude of the acceleration f the mass?

*s) '' {'1-i. 1 .5m/S- iat=l'?=tn n(5.4.

Hl l h

A block is pushed up a frictionless30' incline by an applied force asshown. If f = 25Nand M = 3.0 kg, what is the magnitude of the resulting total acceleration [we havevity, tool of the block?

3a t.u 2d 'tr aa.b.c.q .e.

.,.tfth1,.;-7=,Gf / , ) rv/ s4.6m/s2J.5 m/ s -2.9 rn/ s25. 1 m/ S-

5 .' t 1

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An astronaut [m = 81.6kg] lifts off from planet Zuton in a spaceship. The free-fallaccelerationn Zuton s 3.0m/s2 (down).At the momentof liftoff the accelerationf

h Bzn o*=h - 3 2 ,t " -IJr^,*b .c,d.

the spaceship is 0.50m/gf{gn). \A4rat s the magnitude of the forceof the spaceship onthe astronautl I l-Cnc t fdrp : F * . t r t ' Q

0.20 N0.37 Nal,_(a , f z


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b .

17The horizontal surfaceon which the objectsslide s frictiorLless.f M = 1.0kg and themagnitude of the forceof the small block on the large block is 5.2 N, determine F.: f Zv =74

'IVrreb .d.e,

6.0N&.8N4.1N Z E 2n,W = (zn te{ . s . 2 CIr/7.c,Two bodies,A and B, collide asshown in Figuresa and b below.t o ta t u . t u

(a ) (b)Which statement s true?a. They exertequal and opposite orceson eachother n (a)but not in (b).a, They exert equal and opposite orceon eachother n (b)but not in (a).I Theyerert equaland opposite orceon eachother n both (a)and (b). 9id. The forcesareequal and opposite o eachother n (a),but only the componentsof the forcesparallel to the velocitiesareequal n (b).e. The forcesareequaland opposite n (a),but only the componentsof the forcesperpendicular to the velocitiesare equal n (b)

8.

0Threeboxesslide on a frictionlesshorizontal surfacewhen pulled by a force ofmagnitude F. When we cornpare he tensionsI and T, with the force F, we find ihat

a.b .

'1 - - ' , t ' - ET t = F > T zF > T r = T r .L > 1 1 > 1 2 . VF T 1 < 7 1 - T 2 .

c ,!)e,

a


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9..7A roller-coaster ar has a massof 500kg when fully loaded with passengers. he carpasses ver a hill of radius 15 m, asshown.At the top of the hi1l, he car has a speedof

(

a,b .

7.0kN up7.0kN down2.8kN downa ' < - - \ ' \


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1 1 .c An objectmoving along the :r axis s actedupon by a forceF, that varies with positionasshown. How much work is done bv this force as he obiectmoves romx = 2 r r . t o x = 8 r n ?r, (N) ",. . . . ' -* '7L L)=: fin,


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13.Ea.Ic.d .

Carts A and B have equal masses nd travel equal distancesD on side-by-sidestraightfrlctionless racks while a constant orce F actson A and a constant orce 2F actson B.Both carts start fuomrest. The velocitiesvo and vuof the bodies at the end of distanceDare related by ft: tr *> 1,4)E 2p *>2rJ

v u = 2 v o ,vA = 2vB.

tu =1p .,ro.*., /a -) v.-',1rr -) 'r{ v

*r = '+ r/r

1.4.? A champion athletecan produce one horsepower(746W) for a short period of time. Ifa athletewere to bicycle [70-kgcombined athlete+ bike] to the summit of a 500m highmountain while expending power at this rate, she would reachJhe sumrnit in ho,rvaany seconds?a. 1100035000

L l + a 6P 7d.

physics i example exam and solutions

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