Exam 1 on FEB 12.2014- Phvsics105- R. Schad YOUR NAME 4*{ /}.'3 L. This is to identify the exam versionyou have - IMPORTANT Mark the A 2. This is to identify the examversion you have - IMPORTANT Mark the B A ball is thrown up into the air. While the ball is in free fall, what doesits acceleration do? 3. E 4. + 5. A) B) C) D) increases remainsconstant increasesand then decreases decreases If a caris traveling nurthwaxl and slowing down, what is the directionof the accelerationon the car that causesit to slow down? 1. 2. 3. 4. 5. southward eastward northward westward neitherof these If an q [graph shows acceleration[in m/s2 as a function of time in s] At which time would it reachits largestpositivevelocity? 1. Alzeroseconds 2. At 1 second /^\\^_^ (J.) /\t Z seconds 4. At 3 seconds 5. At 4 seconds 6. n A ball is thrown off a building with a straight horizontally initial velocity of 15 m/s. When it hits the ground 20 m below, how far away from the foot of the building will it be? /r m 02. 30.3 15.0m D xl- )o 3tn F b. c. d. e. 4.5N 9.0N 9.8N 3 . 0N zeto 'F - ,f z | = pva I (*t frZ P 't - /tt4,a - *tu- 3 J.iiz c*" The horizontal surface on which the objects slide is frictionless. The left mass is 2 kg, the right 4 kg and the magnitude of the force F with which you push the small block is 4.5 N, determine the force the small block is exerting on the large block. a. 8. * v,*oS r ts t c' tr t 35.0m 4. 9.8m 5. None of the above J. 7. 'Yf:y r^,) 1r=6, I 4, Y,) ,u" *f,2=4kt T-z o Which of the following cofiecYlydescribesthe centripetalaccelerationvector for a particlemovingwith constantspeedon a circularpath? A) B) c) D) constantand alwaysparallelto the velocity vector for the particle magnitudeand alwaysperpendicularto the velocity vector of constant for the particle of constantmagnitudeand alwaysparallel to the velocity vector of the particle constantand alwaysperpendicularto the velocity vector of the particle . Jar A ball was thrown such that its maximum height is 1,0m. At this highest point it has a total velocity of L0 m/s. What was the initial magnitude of the velocity it was thrown wi 1.. 10m/s 2. 'J"4m/s A l9l rzm/s 4. 24m/s 5. None of these The free-body diagram of a mass on a horizontal plane with friction, being pushed to the right at constant speed is most closely: e) none of these 11. €, l( U 30 kg]favoritetoy. I A hippo [2000kg] is siuing on Johnny's [mro6ooy: I The groundhasa coefficientof friction of trr: 0.5. | Pushingthe hippo horizontally with all his might, till his feet slide, Johnnytries to move I tne nippo away.Doesnot work. What is the friction force the floor is exertingon hippo during this attempt? 1. Zerc 2. 147N 3. 9800N 4. 9947N 5. None of the above r" FPutor ? rFt rrypv t r, / 4" <"po' FaB F=l---^' I tV,^tu ' PR,'/"4r^", -r =2z ( /oet n( no,t 'lo(o-/ 5 )o q.F /v 12. A small rocket movesstraightup with a constantacceleration. Then it cuts off the engineslit is still closeto earth,thus gravttyactsat regular strengthl.Finally it hits the ground. Which of the following graphsqualitativelycoffespondsto the scenariodescribed? The L 4-5 3.5 L.5 L 2. J. -1 -z -3 -4 13. 4 You throw 2balIs, ball A vertically upwards, ball B with a 45 deg angle.They have the sameinitial speed. Which one would have the larger accelerationat the highestpoint? L.A 2.8 3. They will have the sameacceleration. L4. B If a rocket would fly according to the following graph, showing vertical velocity [in m/s] as a function of time [in units of s] What would be the highest point? 3 2 1 tlon< -2 -3 -4 1. 4m f*- U^ 3. Zero 4. 16m 5. 42m velocity acceleration gravitationalacceleration v: dx/dt a: dvldt a: g:9.8 m/s2downwards Kinematics (1-dimensional) Vf:Vi+a't ProjectileMotion (2-dimensional) Vxf: Xr: xi* v;'t* %'a'( v? : viz + 2a'(xs- x1) V y f : V y i+ a ' I Vxi ,r ?:ur r ' +2ar ' ( yr - yi) Xf : Xi l- V*i 't Y r : Y i * v y i ' t+ l r ' a ' t 2 Newton'sLaw F: m'a Frz = - F21[action/ reactionin opposite directionsl Friction Ffriction : FN F Radial accelerationfor circular motion Radial Force for circular motion Hooke'sLaw (springforce) quadraticequationx'r pX * q: 0 ap,6ia1: vtk Fradial: mv'h = -k x Fsp11n, x1,2:-pl2+ 1pzl4- q)t''
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