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# Physics 6A PHYS 6AL

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This 16 page Bundle was uploaded by martinlutharking on Friday October 9, 2015. The Bundle belongs to PHYS 6AL at a university taught by in Fall 2015. Since its upload, it has received 18 views.

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Date Created: 10/09/15

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different sets of multiple choice questions different students get questions in different orders Make sure to enter the appropriate TEST FORM A B C or D on your scantron sheet Take your test home with you You may want to mark your answers so that you can check your score once the solutions are posted YOUR TEST FORM IS A DO NOT TURN THIS SHEET OVER UNTIL YOU ARE IN STRUCTED TO DO 5 0 Question 1 A ball strikes a wall with a speed of 30 ms and bounces straight back with a speed of 26 ms The collision takes 20 milliseconds What is the magnitude of the average acceleration of the ball during the collision a 2800 ms2 b 1300 ms2 c 200 ms2 d 1500 ms2 6 zero Question 2 A train consists of an engine car mass 2000 Kg a middle car mass 2000 Kg and a caboose mass1000 Kg The train is accelerating at 5 msz What is the tension force in the coupling between the middle car and the engine car g Her 39 I a 25000 N b 20000 N c 15000 N d 10000 N r 2 W You shoot a bullet at an apple high up in a tree some distance in front of you hoping to knock it loose so you can catch it and eat it Ignoring air resistance in order to hit this apple you must aim a directly at it b above it c below it W A 5000 N weight is held suspended in equilibrium by two cables attached to the ceiling and the wall as shown in the figure What is the tension in the cable attached to the wall rounded to the nearest 10 N a 3340 N b 4000 N c 8310 N d 6640 N want tension in this cable Question 5 If a vector A has components Ax gt 0 and Ay gt 0 then the angle that this vector makes with the positive xaxis must be in the range a 0 to 90 b 90 to 180 c 180 to 270 d 270 to 360 6 cannot be determined without additional information Question 6 Two identical masses are attached by a massless cord passing over a massless frictionless pulley They are held at different heights see Figure and then released After they are released a The lower mass will move downwards b The higher mass will move downwards c The masses will not move Question 7 Two athletes jump straight up John has twice the initial speed of Harry Compared to Harry John stays in the air a 050 times as long b 141 times as long c twice as long d three times as long e four times as long Question 8 Al is standing in an elevator that is accelerating upward How does the upward normal force N exerted on Al by the oor of the elevator compare to his weight W a NW bNgtW cNltW Question 9 Refer to the Figure Vector S as expressed in terms of vectors M and N is given by a M N b M N c M d N e None of the above Question 10 Which of the following situations is impossible a An object has velocity directed east and acceleration directed east b An object has zero velocity but nonzero acceleration c An object has constant nonzero acceleration and changing velocity d An object has velocity directed east and acceleration directed west e An object has constant velocity and changing acceleration Question 11 A jogger runs halfway around a circular path With a radius of 30 m What is her displacement a 60 m b 30 m c 94 m d 188 m 6 zero Question 12 A 20kg projectile is launched at an angle to the horizontal Initially its horizontal velocity is 30 ms and its vertical velocity is 20 ms For how long Will the projectile be in the air a 15 sec b 20 sec c 30 sec d 33 sec 6 41 sec Question 13 You drive 600 km at 500 kmh and then another 600 km at 900 kmh Your average speed over the 120 km drive Will be a greater than 700 kmh b equal to 700 kmh c less than 700 kmh d exactly 380 kmh 6 cannot be determined from the information given must also know directions traveled ysics 6A TR Section Winter 2012 Midterm The test consists of 19 multiple choice questions Enter the answer to the multiple choice questions in the pink scantron sheet Use a pencil not a pen There is no penalty for the wrong answer Write your name and perm number on the scantron sheet The scantron sheet has an entry box labeled TEST FORM There are 4 slightly different sets of multiple choice questions different students get questions in different orders Make sure to enter the appropriate TEST FORM A B C or D on your scantron sheet Take your test home with you You may want to mark your answers so that you can check your score once the solutions are posted YOUR TEST FORM IS A DO NOT TURN THIS SHEET OVER UNTIL YOU ARE IN STRUCTED TO DO 5 0 Question 1 A 2newton force acts on a 3kilogram mass for 6 seconds The change of velocity of the mass is a 18 ms b 2 ms c 36 ms d 4 ms 6 36 ms Question 2 A man weighing 800 Newtons is standing in an elevator If the elevator rises with an acceleration of 98 meters per secondz the force exerted by the elevator on the man will be a 400 N b 800 N c 1200 N d 1600 N e 2000 N W A person pushes two boxes with a horizontal force of 100 N on a frictionless oor 100 N Box A is heavier than box B Which of the following statements is correct a Box A pushes on box B with a force of 100 N and box B pushes on box A with a force of 100 N b Box A pushes on box B harder than box B pushes on box A c Boxes A and B push on each other with equal forces less than 100 N d The two boxes will not begin to move unless the total weight of the two boxes is less than 100 N 6 None of the above W A 100kg mass is observed to accelerate at 100 ms2 in a direction 300quot north of east The force F 2 acting on the mass has a magnitude of 500 N and is directed north Determine the magnitude of the force F1 directed east acting on the mass a 577 N b 500 N c 866 N d 1000 N e 1500 N Question 5 A drag racer starts from rest and accelerates at 10 ms2 for the entire distance of 400 m What is the velocity of the race car at the end of the run a 45 msec b 89 msec c 135 msec d 180 msec e 215 msec Question 6 Compare the two situations shown in the Figure On the left A James is holding the rope and keeping the bucket at rest On the right B James ties the rope to the bucket so that it keeps the bucket at rest In both cases the bucket contains the same quantity of water In what case is the tension in the rope higher a left b right Question 7 c It is the same in both cases d We need more data to answer The slope of a line connecting two points on a position versus time graph gives a displacement b instantaneous velocity c average velocity d instantaneous acceleration 6 average acceleration Question 8 Ar Refer to the Figure The components of vectors A and B are a Ax Bx B sin 30 b Ax A sin 90 Bx B cos 60 c Ax A cos 0 Bx B cos 60 d Ax A cos 90 Bx B sin 60 e Ax A cos 90 Bx 0 Ay 0 Ay A cos 90 Ay A cos 90 Ay A sin 90 Ay A sin 90 B B cos 30 B B sin 60 B B cos 30 B B cos 60 By 0 Question 9 A packing crate slides down an inclined ramp at constant velocity Thus we can deduce that a a frictional force is acting on it b a net downward force is acting on it c a net upward force is acting on it d it is not acted on by appreciable normal force 6 it is not acted on by appreciable gravitational force Question 10 A furniture truck is moving along a level road at constant velocity An object drops from the midpoint of the ceiling inside the truck Where on the oor will the object land a Depends on the velocity of the truck b Exactly on the point below the midpoint of the ceiling c Ahead of the point below the midpoint of the ceiling d Behind the point below the midpoint of the ceiling Question 11 A ball is thrown with an initial angle of 600 with respect to the horizontal and speed 230 ms from the top of a 490 m high building What is the horizontal component of the velocity when it hits the ground a 49 ms b 23 ms c 115 ms d 199 ms 6 386 ms Question 12 Which of the following is an accurate statement a The magnitude of a vector can be zero even though one of its components is not zero b The magnitude of a vector is independent of the orientation of the coordinate system c Even though two vectors have unequal magnitudes it is possible that their sum is zero d Rotating a vector about an axis passing through the tip of the vector does not change the vector 6 It is possible to add a scalar quantity to a vector Question 13 A large gun is aimed horizontally and fired The bullet39s initial speed is 754 ms What is the speed of the bullet 400 s after it is fired a 115 ms b 425 ms c 392 ms d 850 ms 6 754 ms Question 14 Two objects have masses m and 5m respectively They both are placed side by side on a frictionless inclined plane and allowed to slide down from rest a It takes the lighter object 5 times longer to reach the bottom of the incline than the heavier b It takes the lighter object 10 times longer to reach the bottom of the incline than the heavier c It takes the heavier object 5 times longer to reach the bottom of the incline than the lighter d It takes the heavier object 10 times longer to reach the bottom of the incline than the lighter e The two objects reach the bottom of the incline at the same time Question 15 A cheetah can run at approximately 100 kmhr and a gazelle at approximately 80 kmhr If both animals are running at full speed With the gazelle 70 m ahead how long before the cheetah catches its prey a 107 sec b 252 sec c 126 sec d 63 sec e 98 sec Question 16 A railroad train travels forward along a straight track at 80 ms for 1000 m and then travels at 50 ms for the next 1000 m What is its average velocity a 700 msec b 615 msec c 637 msec d 650 msec Question 17 A 40kg object is moving across a frictionless surface With a constant velocity of 2 ms Which one of the following horizontal forces is necessary to maintain this state of motion a 0 N b 05 N c 20 N d 80 N e depends on the speed Question 18 A box is sliding down a ramp What is the Free Body Diagram for the forces on the box Question 19 A mass m is pushed With a horizontal force F on a horizontal oor The coefficient of static friction is us and the coefficient of kinetic friction is K The mass does not move The magnitude of the frictional force on the mass is a Ms mg b MK mg C F 01 mg 6 Ms F PM was a e 1 all M LT u 7322 n 2 13 m I PHiEsAwavAti fg w 39 m g 7393 5 U 39i 1 n a I in quot a a V u I I x l can r t v W quot r d A h V T71quot 6053949600 9 e i e e a z e Vifampampf m e e d t mm e i W Jizx 1de M B 64 week 17 w 1 k d AVALQW WW L 39Ngu 39 e x 00ng mst v no M 142 So womemcew E 1 O ts FL 39atomaQ g 4 W3 Wm gt 39 U W gt A u 237 bgm who m h 72 A A i 1 The WW WM 42 u Warm Vmogg Z3 Lois 50 3 M m I quot7 33 Homom e um I 39 conswr 9275 W a W mm g 1 u p 3 W w 8 m ee 4d aquot 7519511quot 36 127quot AI5 dareW i SMQ MC t J y or Q quot3 0 X er 7 a w O 02 00 K I X i Kit0 429 4526 X6 X efUEJ a VEEm 6006 gtC 3 Kg 406 3 Kala rt f 100 ZZW W S quot I W xa o 39 3 22 WQ c I e 6725 see F r I 27773523 i I AX 2900 W MK I 44 4 J When 4

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