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# GENERAL PHYSICS 1 PHYS 1110

GPA 3.96

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This 28 page Class Notes was uploaded by Mrs. Peter Toy on Friday October 30, 2015. The Class Notes belongs to PHYS 1110 at University of Colorado at Boulder taught by Staff in Fall. Since its upload, it has received 12 views. For similar materials see /class/232121/phys-1110-university-of-colorado-at-boulder in Physics 2 at University of Colorado at Boulder.

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Date Created: 10/30/15

RI l A car39s hood has a surface area of 2 m2 What is the surface area in cmz Pink 200 cm2 Green 2000 cm2 Blue 20000 em2 2x104 cm2 Yellow 2x105 cm2 Purple None of these RI 2 Consider the equation a X2 b X 0 Solve for X Pink X ba Yellow X ab Green X ab Blue X ab Purple None of these RI 3 An object39s acceleration vs time is LIl Which graph best represents the object39s velocity vs time a t V Pink V Yellow V Blue V Green Purple None of these RI 4 A student is asked the following question on an exam A car is moving at 90mph and suddenly brakes with a constant acceleration 2g to a full stop How many second does the car take to stop Which equation can be used to answer the question Yellow X 2 X0 vOta t2 Blue V 2 v0 at 2 2 Green V v0 2ax X0 RI S At t 0 a projectile is fired straight upward from a cannon It goes up and then comes down Assume that there is no air resistance Upward is chosen as the positive ydirection Which of the following graphs most accurately shows velocity vs time for the projectile during its ight V Pink V Yellow V Green t t t Blue t Purple None ofthese RI 6 Consider the vector A y Which equation is correct Yellow AX A cose Blue AX A cose 9 Green AX A sine Pink A A sine X RI 7 Suppose you know the velocity vector of a particle at a particular instant of time and it is parallel to the ground What do you know about the acceleration a of the particle v Pink The velocity vector and the acceleration vector are always either in the same direction or in opposite directions Yellow The acceleration vector is straight down Green You know nothing at all about the acceleration vector Blue The acceleration must be zero RI8 Consider the vectors V1 and V2 shown Which is the vector is AV V2 V1 V1 AV T Pink Y elow 1 Green Blue RI9 An elevator is going up at a constant speed Near the top oor it starts to slow to a stop During the period that it is slowing down its acceleration is BLUE downward YELLOW upward PINK in some other direction RIlO The quotmulti ash photographquot below shows a ball rolling along a surface The camera ashed once a second and the time 39 shown above each image 012 3 4 5 5 7 8 anlllz o uoou Which graph below best represents the ball39s Velocity as a function of time YELLOW GREEN V t t V PINK V PURPLE D t t Rll 1 What is the direction of vector C A 13 AX 1 Ay 1 BX 2 By 2 Y Blue Pink X Green Yellow Purple if along X or y axes RI12 A particle is moving with constant acceleration Its velocity vector at two different times is shown below What is the direction of the acceleration A B1 V u 7 Purple None of these Green Yellow V2 Pink T RIl3 Consider the vectors A and B as shown A has magnitude 2 and B has magnitude 1 What is the direction of the vector A 3 B A gt 4 B Pink Right gt Yellow Left lt Green No direction because the vector is zero RI 14 The vector A has length 5 The vector B has magnitude 4 You have no other information about the two vectors Consider the following statements about the vector AB A The magnitude of the vector AB can be between 5 and 9 B The magnitude of the vector AB can be between 0 and 4 C The magnitude of the vector AB can be between 1 and 9 D The magnitude of the vector AB can be between 1 and 9 Which statements if any are true Pink A only Yellow A and C only Pink D only Purple None of these RI l A car39s hood has a surface area of2 m2 What is the surface area in cmz Pink 200 cm2 Green 2000 cm2 Blue 20000 cmz 2gtlt104 cm2 Yellow 2gtlt105 cm2 Purple None ofthese Answer 2gtlt104 cmz 2m2 39 00 0mg 239 1002cm2 239 104cm2 1m B RI 2 Consider the equation a X2 b X 0 Solve for X Pink X ba Yellow X ab Green X ab Blue X ab Answer Actually there are two solutions X 0 and X ba RI 3 An object s acceleration vs time is a I t Which graph best represents the obj ect s velocity vs time V Pink V Yellow V Blue V Green Purple None of these Answer Yellow Green is not quite correct because the relative magnitudes of the accelerations the slopes of v vst are wrong RI 4 A student is asked the following question on an exam A car is moving at 90mph and suddenly brakes with a constant acceleration a 72g to a full stop How many second does the car take to stop Which equation can be used to answer the question Yellow X 2 X0 v0ta t2 Blue V 2 v0 at 2 2 Green V v0 2ax X0 Answer Blue RI S At t 0 a projectile is red straight upward from a cannon It goes up and then comes down Assume that there is no air resistance Upward is chosen as the positive y direction Which of the following graphs most accurately shows velocity vs time for the projectile during its ight V Pink V Yellow V Green Blue Purple None ofthese Answer Yellow This is a graph ofv v0 gt RI 6 Consider the vector A y Which equation is correct Yellow AX Acose Blue A A 0059 X X 9 Green AX A sine A Pink AX A sine Answer Ax A sine RI 7 Suppose you know the velocity vector of a particle at a particular instant of time and it is parallel to the ground What do you know about the acceleration a of the particle v Pink The velocity vector and the acceleration vector are always either in the same direction or in opposite directions Yellow The acceleration vector is straight down Green You know nothing at all about the acceleration vector Blue The acceleration must be zero Answer You know nothing at all about the acceleration vector To know the acceleration you need to know the velocity at two different times Acceleration is the time rate of change of the velocity RI8 Consider the vectors V1 and V2 shown Which is the vector is AV V2 V1 V V AV 2 Pmk Yellow gt Green Blue Answer Blue down The AV has to be in the direction which will satisfy the equation V1AV V2 which is equivalent to AV V2 V1 V1 AV V2 RI9 An elevator is going up at a constant speed Near the top oor it starts to slow to a stop During the period that it is slowing down its acceleration is BLUE downward YELLOW upward PINK in some other direction Answer downward Can you draw the correct AV V2 V1 vector diagram to illustrate that the acceleration is down R140 The multl ash photograph below shows aball rolllng along a surface The earnera asheol onee a seeonol andthe e ls shown above eaeh lmage 012 3 4 5 6 7 8 91EI1112 one o o o o o o 0000 Whlch graph below bestrepresents the ball s veloclty as a functlon of hrne7 Y ELLOW GREEN V PINK v PURPLE Answer Purple RIll gt What is the direction of vector C A B Ax1 Ayl 13x 2 By2 Y Blue Pink X Green Yellow Purple if along X or y axes Correct answer is Blue Cx Ax BK 1 2 l Cy Ay By 1 2 3 The vector C points to the upper left in the second quadrant RI12 A particle is moving with constant acceleration Its velocity vector at two different times is shown below What is the direction of the acceleration A V V Blu7 1 Purple None of these Green Yellow A V Pink 2 X Answer The direction of the acceleration is the same as the V2 direction of Av which is up Remember the vector Av is the vector you vectoradd to vector VI to get vector vz AV V1 g Hltl RIl3 Consider the vectors A and B as shown A has magnitude 2 and B has magnitude 1 What is the direction of the vector A 7 3 B A gt 4 B Pink Right gt Yellow Left Green No direction because the vector is zero Answer Right A is to the right The vector 3B is also to the right RI 14 The vector A has length 5 The vector B has magnitude 4 You have no other information about the two vectors Consider the following statements about the vector AB A The magnitude of the vector AB can be between 5 and 9 B The magnitude of the vector AB can be between 0 and 4 C The magnitude of the vector AB can be between 1 and 9 D The magnitude of the vector AB can be between 1 and 9 Which statements if any are true Pink A only Yellow A and C only Pink D only Purple None of these Answer None of these A and D only Note that answer A is a subset of answer D For a very similar problem See the CAPA solution to Set 3 problem 11 on the web site RI l An object s acceleration vs time is a I t Which graph best represents the obj ect s velocity vs time V Pink V Yellow V Blue V Green Purple None of these Correct answer is Yellow RI 2 A student is asked the following question on an exam A car is moving at 90mph and suddenly brakes with a constant acceleration a 2g to a full stop How many second does the car take to stop Which equation can be used to answer the question Yellow X X0 Vot a t2 Blue V V0 at 2 2 Green V V0 2aX X0 Answer V Vo at We know the initial velocity V0 the nal speed V0 and the acceleration a We seek the time t RI 3 Consider the vector A y Which equation is correct Yellow Ax Acose Blue A A cos9 X Green A A sine a Pink Ax A sine Answer AX Asin9 R14 The multl ash photograph below shows aball rolllng along a surface The earnera asheol onee a seeonol andthe e ls shown above eaeh lmage 012 3 4 5 6 7 s 91EI1112 one o o o o o o 0000 Whlch graph below bestrepresents the ball s veloclty as a functlon of hrne7 YELLOW GREEN V t t V PINK V PURPLE t Cement answer ls Purple RI S What is the direction of vector 6 A B Ax l Ay 1 Ex 2 By 2 y Blue Pink Green Yellow Purple if along X or y axes Correct answer is Blue Cx Ax BK 1 2 l Cy Ay By 1 2 3 The vector C points to the upper left in the second quandrant RI 6 A particle is moving with constant acceleration Its velocity vector at two different times is shown below What is the direction of the acceleration Blu7 Purple None ofthese Green Yellow V 2 Pink X Answer The direction of the acceleration is the same as the V2 direction of Av which is up Remember the vector Av is the vector you vectoradd to vector v1 to get vector v2 g Hltl RI 7 A projectile is red at an initial speed of V0 at an angle of 9 above the horizontal Which of the following expressions could possibly be the correct expression for the range of the projectile Hint check the units Pink X 2 g V0 tane Yellow X 2 gzv0 sin29 V2 Green X sin29 Blue X izsinQG g V 0 2 Answer Only the equation X V7quotsin29 has the dimensions of length on both sides of g the equation RI S A car moves around a gureeight track at a constant speed in the direction shown Over which part of the track is the magnitude of the car39s acceleration smallest B D A Blue from A to B Green from C to D Yellow Neither Answer Neither When moving along the straight portions of the track B to C or D to A the acceleration is zero RI 9 An elevator is going up at a constant speed Near the top oor it starts to slow to a stop During the period that it is slowing down its acceleration is BLUE downward YELLOW upward PINK in some other direction Answer Acceleration is downward even though the velocity is upward Use the quotdeltavquot argument to see this RI 10 A bucket containing a brick is swung in a circle at constant speed in a vertical plane as shown The bucket is swung fast enough that the brick does not fall out The net force on the brick as it is swung has maximum magnitude at position Pink Top Green ottom Yellow Bight Purple The net force has the same magnitude at all positions Answer The net force has the same magnitude at all positions Since this is circular motion with constant speed the magnitude of the acceleration aV2R is constant and so is Fnetma Consider the normal force exerted on the brick by the bucket when the bucket is at the three positions shown R T B The magnitude of the normal force is a minimum at position Pink lop Yellow Bight Purple The normal force has the same magnitude at all positions T Answer The normal force is minimum at position Ttop At both positions B and T the normal force N vector added to the weight mg is the net force Fuel Since Fuel and mg are constant in magnitude N is minimum when it points in the same direction as mg

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