Exam 1 with Answer Key for General Physics 1 | PHYS 1110, Exams of Physics

Download Exam 1 with Answer Key for General Physics 1 | PHYS 1110 and more Exams Physics in PDF only on Docsity! PHYS 1110 Exam 1 NAME: K EA Student ID # Section number and TA Name: Exam Version 0002 Please do not open the exam un Your exam should have 9 pages, numbered E1.1 thru E1. This exam consists of 15 multiple choice questions, wort! worth 25 points, for a total of 100 points. e Write your answers in the space provided on each page foi the page if needed. Circle the correct letter for the multip! WORK ON THE WRITTEN QUESTIONS. Full credit accompanied by your reasoning. PLEASE!! 1. Print your name on each page in the space provided. 2. Print your student Identification Number on the page 3. Bubble your name, ID, and exam version number on t 4. Write the name of your TA neatly in the big blank space at the bottom of the bubble sheet. Our TA's names are Charles Bailey, Max Brown, Jeremy Brown, Murray Holland, Qi Hu, Peter Lowell, Ben Spike and, Amy Sullivan Irecommend: Don’t waste time erasing on the written problems. Just put a line through defective reasoning. Ask for more paper if needed. At the end of the exam, check that you have completed all the questions. By handing in this exam, you agree to the following statement: "On my honor, as a University of Colorado Student, I have neither given nor received unauthorized assistance on this work" Signature. Possibly useful information: On any problems involving gravity, use g=10 m/s”! As always, neglect friction or air resistance (unless otherwise clearly stated) Good luck! Fall 2007 El.1 First Midterm PHYS 1110 Exam 1 NAME: Circle the closest answer and Bubble in questions 1-15 ON YOUR BUBBLE SHEET! 1) The position vector of an object is given by# =10 (#2 +¢2)?+5(t* -#) 7. What is the magnitude of the x-component of the acceleration at t = 2 sec? (Ay}40 mi? B) 160 m/s” C) 197 m/s? D) 240 m/s” E) 279 m/s” 2) The average velocity of an object is equal to its instantaneous velocity. This statement is : A) always true. B) never true. O's true only when the velocity is constant. D) is true only when the velocity is increasing at a constant rate. E) is true only when the object is moving in a straight line. 3) A person is standing on a roof 5 m above the ground. She throws a hammer straight down with an initial velocity of 3 m/s. What is the speed of the hammer just before it impacts the ground? A) 3 m/s B) 9.8 m/s 0.4 m/s D) 15 m/s E) 17.3 m/s 4) A golf ball is hit from the ground with a velocity of 20 m/s at an angle of 30° to the vertical. The speed of the ball at its maximum height is: 20 m/s 0 m/s C) 15.4 m/s D) 17.3 m/s E) 20 m/s A) 0 m/s ' 5) Three books (X, Y, and Z) are resting on a table. The weight of each book is indicated. The force of book Z on book Y is: x 4N A)ON B)SN Y 5N 9N Z D)10N 10N E)19N Fall 2007 E1.2 First Midterm PHYS 1110 Exam 1 NAME: This graph of position (in one dimension) as a function of time is for question 13: Ose NWA 0 1 2 3 4 time (seconds 13) The velocity as a function of time is best represented by which graph? Vv Vv 0 t B) A) 0 t Vv Vv 0 t ° 0 t Vi . -——_————— 0 t E) 14) A bucket of mass m is being lowered straight down at constant speed by a massless rope. The rope has a tension, T. How does the magnitude of T compare to that of the weight (mg)? T=mg B) T>mg C)T<mg D) not enough information given Fall 2007 EL.5 First Midterm PHYS 1110 Exam 1 NAME: 15) Each grid box has velocity units of one m/s both horizontally and vertically. The velocity vector of a particle changes from V, to V2 with uniform acceleration. The change in velocity AV is vector A, B,©@)D or E (none of these). Fall 2007 E1.6 First Midterm PHYS 1110 Exam 1 NAME: A person moves along a curved sidewalk on a flat, horizontal surface. At point A the person is slowing down. Somewhere between points A and B she starts to speed up. The person then speeds up until somewhere between points C and D. She travels with constant speed past point D, then starts to slow down, and turns around at point E. 1) On the diagram below, draw an arrow to indicate the direction of the velocity of the person at each of the points A through E and label each as Va, Vp, Vc, Vp, and V¢ respectively. If the velocity is zero at any point, state so explicitly. For each point briefly explain your reasoning below. Point A: Velocity iS tangent ty the poth Point B: Ve loc ty is Longent ko tho pot Point C: Velocity {s bangent ky He poth Point D: Velocity iS Longent co He pecth Point E: Velocity is Zero When the pevsen turns around. D / / \ / Sh des ah y \ Top View Fall 2007 E1.7 First Midterm