Phys172F08FinalA-1-1 - Test Form A Final Exam PHYS 172 Fall...

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Sheet1 Page 1 Test Form A Final Exam PHYS 172 ø Fall 2008 Instructions for ANSWER SHEET: FIRST, enter Test Form A. Then, 1. Enter Last Name, First Name, MI. 2. Enter PUID in Student Identification Number. 3. Course = PHYS 172 5. Finally, sign your name. Do all of the above steps before beginning your exam. This is a closed book exam. Each problem is worth 14 points, except for the VPython question that is worth 18 (for a total of 200 points). Show your Purdue ID card when turning in your answer sheet. Page 1 of 8 P Test Form A Problem 1: The following program models a disk with a string wound around its circumference. The string is pulled upward with a constant tension of the correct magnitude so that the disk hovers at the same vertical position as the disk spins. Initially the disk is not spinning or moving in any direction. from visual import * g=9.8 R=1 m=1 I = 0.5 * m * R * R ## Moment of inertia of disk disk=sphere(pos=(0,0,0), radius=R, color=color.yellow) r= vector(-R,0,0) Tension = vector(0,m*g,0) torque= cross(r,Tension) Fgrav=vector(0,-m*g,0) Fnet = Fgrav+Tension disk.L=vector(0,0,0) disk.p=vector(0,0,0) theta=0 deltat = 0.001 t=0 while t < 3: disk.L= ??
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Sheet1 Page 2 omega= ?? theta = theta+omega.z*deltat disk.p=disk.p+ Fnet*deltat disk.pos=disk.pos+disk.p/m*deltat t=t+deltat Which of the following correctly completes the code defining disk.L (the angular momentum of the disk) and omega (the angular velocity of the disk)? 1) disk.L = disk.L + torque*deltat omega = omega + disk.L/I 2) disk.L = disk.L + Fnet*deltat omega = disk.L/I 3) disk.L = disk.L + torque*deltat omega = disk.L/I 4) disk.L = disk.L + Fnet*deltat omega = omega + disk.L/I 5) disk.L = disk.L + Fnet*deltat omega = v / r Page 2 of 8 P Test Form A Problem 2: A stationary particle in space decays into two fragments. One of the fragments is observed to have a momentum of <8.2,3.5,-7.4> kg m/s just after the decay. The other particle is invisible to the detector and so its momentum cannot be directly measured. What is the momentum of the invisible particle? 1) <8.2,-3.5,7.4> kg m/s
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Phys172F08FinalA-1-1 - Test Form A Final Exam PHYS 172 Fall...

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