Exam3_Fall07 - TEST FORM A PHYS 172 Fall 2007 Thursday...

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1 TEST FORM A PHYS 172 Fall 2007 Thursday, November 29 EXAM 3 There are two parts to Exam 3: the machine-graded part of this test, and the last page that you turn in to be graded by hand. Machine Answer Sheet: Using a pencil, fill in Last Name, First Name, & Middle Initial, plus your 10-digit Purdue University ID number. Enter Instructor (Durbin, for the 11:30 lecture, or Peterson, for the 12:30 & 1:30 lectures), Course (PHYS 172), Date (11/29/2007), and Test (3). Leave “Section” blank. You must include your Signature. Important : Enter the Test Form that appears on the upper right of this page (A, B, C, or D). The seven machine-graded problems are worth 10 points each (70 points total). Hand-Graded Sheet : Enter your Name, Signature, PUID, and circle your Recitation Section . The hand-graded portion is worth a total of 30 points. When finished with both parts, bring them to the front of the classroom, show your Purdue ID card to the Instructor, and turn in the machine-graded answer sheet and the hand-graded answer sheet at the same time. These two parts together are worth 100 points total. Your grades will appear in the CHIP gradebook within one week. An answer key will be posted soon on the course home page. You should keep this copy of the exam.
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2 K total = K trans + K tot + K vib K total = 1 2 M total v cm 2 = p total 2 2 M total (non-relativistic) ! p total = m total ! v cm (non-relativistic) I = m i r i 2 ! L rot = I " K rot = L rot 2 2 I = 1 2 I " 2 ! L A = ! r A # ! p $ A = ! r A # ! F % = ( q + N & 1)! q !( N & 1)! S = k ln % hoop: I hoop = MR 2 disk: I disk = 1 2 MR 2 sphere: I sphere = 2 5 MR 2 3 1 4 1 2 and x x x x m M m p p v v M m M m ! " # = = $ % + + &
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3 Problem 1 (10 points): The following program models the motion of a spacecraft traveling in the Earth-Moon-Spacecraft system. from visual import * G = 6.7e-11 #Universal gravitational constant Earth=sphere(pos=(0,0,0) , radius=6.4e6, color=color.cyan) craft=sphere(pos=(-10.*Earth.radius,0,0) , radius=3e6, color=color.yellow) Moon=sphere(pos=(4e8,0,0) , radius=1.75e6, color=color.white) Earth.m = 8.8404e24 # mass of Earth Moon.m = 7e22 # mass of Moon
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