Practice Physics

# Practice Physics - ‘1 Physics lA-a 6— 4,47 10'“...

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Unformatted text preview: ‘1) Physics lA-a 6—. 4,47. 10'“ W27er- . Final Ego. 9, 2004 RE = 4,“ we M 2 B Prof. Jose Onuchic ME , (00‘ ’02., [:3 A“ CourseCode Number ’ r. ‘ Comments: t . .232 ' . . MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Gwen releases a rock at rest from the top charm-m tower. If g = 9.8 ml 52 and resistance is negligible, whatisthespeedof - 'thitstheground? ‘ A)14m/s ' C)30m/s D)56m/s E)784m/s \ 2) Awaterrocket, launched from the yound,risesﬁertically with acceleration of30 rn/s2 for l.Oswhen it . runsoutof'hrel".Disregardingairre-sistan- at. willtherocketrise? .’ A)15m _V~B)31m D)91m E)120m K 3) Norma rekases a bowling from rest; it rolls own a ramp with constant acceleration. After half a ‘5‘! m. it hastraVeled 0.75 m. How far has it traveled after two seconds? B) 1.2 m C) 4.7 m D) 9.0 m E) 8.2 m '4) Vector A is 3.0 units in length and points along the positive x-axis; vector B is 4.0 units in length and \ points along a direction 150°£mm the Rositive x—axis. What is the direction of the resultant with respect to ‘ I} L“.\ 7 thepositive x-axis? :- ; , V'f.’ A)77° B) 13° - C) 86° D) 150° 5) A baseball thrown from the outﬁeld is released from shoulder height at an initial velocity of 29.4 ml 5 at an angle of 30.0 with respect to the horizontal What is the maadmum vertical displacement that the ball ' 1A '_ ilB trajectory? Jaglwmﬂfw B) 9.80 m C) 22.1 m D) 44.1 m E) 16.2 an inn Shout 0 ' 6) Astoneisthrownwithaninitial speed of15 m/s atanangleof53°abovethehorizontalfromthetop ofa 35 m If g = 9.8 m/ 52 and air resistance is negligible, then what is the magnitude of the horizontal component of velocity as the rock strikes the 1 - - -_ A) 7.5 m/s B) 12 m/s .\I D) 29 m/s E) 18 m/s A-l Three blocks, connecting ropes, and a light irictionless pulley comprise a system. as shown. An extemal force P is applied downward on block A. The system accelerates at the rate of 7.5 m/ 52. The tension in the rope connecting block B and blockCequalséON.Recallthat the tensionondifferent ropesisdifferent. 7) Bil-igurel,theextemalforoePisclosesttoz A) 170N B) ZION C)250N D)2.30N B)260N cmoN 7 D)320N 9) A man pulls a sled at a constant velocity across a horizontal snow surface. If {force of 80 N is being appliedtothesledropeatanangle of53 °tothe ground,whatis theforoeofﬁ'lctionbetweensledand snow? . AMON B)80N C)48N D)64N 10) A u-apezearﬁsnwiﬁtswing,weighs soo N;heis momentarily held bonesidebyhis‘parlmrso thatthe swing ropes make an angle of 300° with the vertical. In such a condition of static equilibrium, what is the horizontal force being applied by the partner? . A)924N B)400N C) 19w @ _ wow 11) A 100—kgboxisplaced onaramp. As oneend of the ramp israised,theboxbegins tomovedownwardjust as the angle of inclinati 15° . What is the coefﬁcient of static friction between box and ramp? I, \'. A) 0.15 C) 0.50 D) 0.77' 100.95 12) Find the batsion in an elevator cable if the 1 (DO-kg elevator is descending with an acceleration of 1.8 ml 32, downward. . , A)5700N B)8000N C)9800N D)11600N E)13900N 13) A simple pendulum. 1.00 m in length, is released from rest when the support string is at an angle of 35.0 ° fromthevertical. Whatisthespeedofthesuspendedmassatthe bottomofthe swing? (Ignoreair - = 9.80 III/52) ’- B) 0.67 m/s C) 1.33 ml 5 D) 0.94 m/s 14) A 10.0-kg box starts at rest and slides 3.5 m down a ramp inclined at an angle of 10° with the horizontal. If there is no friction betWeen the ramp surface and crate, what is the velocity of the crate at the bottom of the ; = 9.3 m/sZ) B) 4.2 m/s C) 6.1 m/s D) 8.3 m/s E) 10.7 rule 15) An amount of workequal to 1.5] is required to compress the spring in a Springgtm. What is the "launch speed" of a 15-g marble? . A)12m/s C) 15m/s D) 18m/s E)21m/s A-Z 16) A baseball catcher puts on an exhibition by catching a 0.150-kg ball dropped from a helicopter at a height of 100 m above the catcher. If the catcher "gives" with the ball for a distance of 0.750 in while catching it, what average force is exerted on the mitt by -_ all? ; = 9.80 ml 52) A)78N B)119N 6m D)294N E)392N 17) A railroad freight car, mass 15 000 kg, is allowed to coast alonga level track ata speed of2.0 ln/s. It collides and couples with a 50 DOD-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 GOO-kg car is preserved in the two coupled cars after collision? A) 86% B) 100% D) 14% 18) Alex throws a 0.15-kg rubber ball down onto the ﬂoor. The ball's speed just before impact is 6.5 mls, and justafterisasm/s. : ' .- changeinthemagnitudeofdreball‘smomentum? A) 0.09 kg.m/ s C) 4.3 kgm/s D) 10.0 kgml s E) 126 kg.rn/ s 19) 7. A 7.0kg bowling ball strikes a 20kg pin. The pin ﬂies forward with a velocity of 6.0 m/ s; the ball continues forward at as the original velocity of the ball? I ‘ . D 5. .6 A)4.1m/s «(mp C)33m/s ) Omls E)6 m/d 20) No identical 7-kg bowling balls roll toward each other. The one on the left ia'rhoving at +4 ml s while the one on the right is moving at -4 ml 8. How fast is each ball moving after they collide elastically? A Neitherismoving. ‘ C +4 m/s, —4 ml 5 D) -14 m/s, 14 m/s B) +14 ml 5, -14 ml 5 21) At a given point above the surface of the earth, the gravitational acceleration is equal to 9.0 m/sz. The altitude of this point, above the surface of the earth. in km. is closest to: r‘ \ A) 1200 B) 820 C) 400 D) 560 k Situation 1 A 4.0 kg solid sphere, made of metal whose density is 3000 kg/ m3, is suspended by a core. The density of water is 1000 kg/m3. 2) InSituaﬁon1,whenthesphereisimme .w =" a tensionintheoordisclosest to: A)30N B)27N \ D)29N mzeN 23) A satellite is in a circular orbit about the Earth at a distance of one Earth radius above the surface. What is the velocity of the satellite? (The radius of the Earth is 6.4 x 106 at and C: 6.67 f- A) 2,800 m/s B) 4,200 m/s . C) 16,800 m/s 24) An 80-kg man is one fourth of the way up a 10-rn ladder. that is resting against a smooth, frictionless wall. [ftheladderhasamassonOkgand itmakesanangle Ofﬁoowilhtheground,ﬁndfheforceofﬁicﬁonof the ground on the foot of the ladda'. .- ' A)780N B)340N D)85N E)4ON kgatx=0m, and amassofmass 120kgatpositionx=4m1hepositionoftheoenterofmassisatthe following value of x . ' -. A)0m B)-1m D)2m E)-2m ...
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Practice Physics - ‘1 Physics lA-a 6— 4,47 10'“...

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