Phys172F08FinalA-1-1

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

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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= ??
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 16

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

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online