Exam1-1230Fall23Ver1 (1).pdf

Physics 1230 Test 1 Fall 2023 Name: Box Number: Please enter your answers to the first 8 questions on your scantron sheet. Problems 9 and 10 are to be written out on that page. When finished,...

Physics 1230 Test 1 Fall 2023 Name: Box Number: Please enter your answers to the first 8 questions on your scantron sheet. Problems 9 and 10 are to be written out on that page. When finished, please turn in the entire exam. You may use your equation sheet but no other type of notes are allowed. If you are in need of any equations or are unsure about anything please ask me about it. The multiple choice questions are worth ten points apiece while the written questions are worth a total of 20 points. To determine your raw score on this test, incorrect multiple-choice questions will be given zero points while partial credit will be given on problems 9 and 10 based on the amount of work shown, level of completion, closeness to the correct answer, and decipherability. Good Luck!!  (1.) Which of the following motion diagrams satisfies the given velocity and acceleration values. Assume the standard sign conventions for direction. (vy )i : − (vy )f : + ay : + (a) (b) (c) same point same point same point (d) (e) same point  (2.) For the motion diagram and coordinate axis shown, which of the following is the correct x 0 position-versus-time graph? (a) x (b) x t t (c) x (d) x t t (e) x t  v(m/s) (3.) Shown is the velocity-versus-time graph for a car 30 driving on a straight road. Which of the following 20 statements about the car’s motion is correct? 10 (a) The car changed direction sometime between 0 and 2.5 s. t(s) 1 2 3 4 5 (b) The car changed direction at exactly 2.5 s. (c) The car changed direction at both 1 s and 4 s. (d) The car changed direction sometime between 2.5 s and 5 s. (e) The car never changed direction. (4.) For the average velocity vector shown, which of the options in the table correctly labels the components as being positive (+), negative (−), or zero (0)? Remember that vector components always use the standard conventions. Components of the y Average Velocity vav,x vav,y (a) + + − → vav (b) − + (c) 0 0 x (d) + − (e) − −  (5.) Felipe and Samara both go for a walk in the same park. The trajectories for Felipe’s and Samara’s motions are shown below. At which of the labeled points were they moving in the same direction? Felipe and Samara were going in the same (a) direction when they were at the points labeled #1. y #1 #2 Felipe Felipe and Samara were going in the same (b) #3 direction when they were at the points labeled #2. Felipe and Samara were going in the same (c) #4 direction when they were at the points labeled #3. Felipe and Samara were going in the same (d) #3 direction when they were at the point labeled #4. #1 #2 Samara Felipe and Samara were never going in the same (e) direction. x (6.) This graph shows a trains’s position versus time. Using the standard convention for direction, what is the train’s velocity at 5 s? x(m) (a) v = +4 m/s 120 100 (b) v = −4 m/s 80 60 (c) v = +16 m/s 40 20 (d) v = −16 m/s t(s) 1 2 3 4 5 6 (e) v = +50 m/s (7.) An airplane lands on a 2500-m-long runway with a speed of 140 m/s. What is the minimum constant deceleration that the plane must have in order for it to stop safely (assuming the plane moves in a straight line)? (a) a = −35.7 m/s2 (b) a = −17.9 m/s2 (c) a = −8.95 m/s2 (d) a = −3.92 m/s2 (e) a = −0.056 m/s2 (8.) Following the path shown, a cat walks from point A to point B with a constant speed of 7 m/s. What is the magnitude of the cat’s average velocity? y(m) 50 (a) vav = 3 m/s 40 (b) vav = 3.5 m/s B 30 20 (c) vav = 4m/s 10 (d) vav = 5m/s x(m) A 10 20 30 40 50 (e) vav = 7 m/s  (9.) A car follows the curved trajectory shown. For the coordinate system given, sketch the (i.) initial position vector, (ii.) final position vector, and (iii.) displacement vector. For full points, you must label each vector. Also, all arrowheads must be clearly visible. (10pts) Final Initial (10.) Shown are two average velocities for a car travelling on a road with a constant speed. Use graphical vector subtraction to sketch the car’s average acceleration vector at point 1. (The grid to the right should help you redraw the vectors to do the vector subtraction.) If you think the car is not accelerating at point 1, explain why not. (10pts) 0 1 2 Test ID: AA