Welcome to the website of ME 274 for the Fall 2008 semester. On this site you can view blog posts, add your own blog posts and add comments to existing posts. In addition to the blog are links to course material: course information, information on solution videos, exams, quizzes, homeworks and other course-related material. Direct links to the homework solution videos are also available on the left side of this page.


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Sep 24, 2008

Problem 7/15

Suggestions:
This problem is very similar to the problems that we looked at in lecture on Monday. The basic steps:
  1. Attach observer/xyz to dumbbell.
  2. The angular velocity (omega) of the observer has two components: Omega about the FIXED Z axis, and omega_P about the MOVING z axis: omega = Omega*K + omega_P*k
  3. The angular acceleration (alpha) is simply the time derivative of the omega vector: alpha = Omega_dot*K + Omega*K_dot + omega_P_dot*k + omega_P*k_dot . The first three terms on the RHS of this equation are zero. For the fourth term use: k_dot = omega x k
  4. For both parts you will need to convert the K over to i and k to get all components in terms of the same unit vectors. Let us know if you have any question on this conversion.
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