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Physics 218: Mechanics

Physics 218: Mechanics. Instructor: Dr. Tatiana Erukhimova Lecture 34. Quiz. The block of mass M is placed on a rotating platform, a distance L from the center. The coefficient of friction between the block and the platform is .

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Physics 218: Mechanics

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  1. Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 34

  2. Quiz The block of mass M is placed on a rotating platform, a distance L from the center. The coefficient of friction between the block and the platform is . What is the largest constant value that  can have before the block starts slipping?

  3. Newton’s law of gravitation

  4. Orbital motion Conservation of Angular Momentum

  5. Torque and Angular Momentum Conservation of Angular Momentum

  6. An ant of mass m is standing at the center of a massless rod of length l. The rod is pivoted at one end so that it can rotate in a horizontal plane. The ant and the rod are given an initial angular velocity 0. If the ant crawls out towards the end of the rod so that his distance from the pivot is given by , find the angular velocity of the rod as a function of time, angular momentum, force exerted on the bug by the rod, torque about the origin.

  7. For symmetrical objects rotating about their axis of symmetry: Second Law:

  8. A man stands on a platform which is free to rotate on frictionless bearings. He has his arms extended with a huge mass m in each hand. If he is set into rotation with angular velocity 0 and then drops his hands to his sides, what happens to his angular velocity? (Assume that the man’s mass is negligible and that his arms have length R when extended and are R/4 from the center of his body when at his sides.)

  9. Have a great day! Hw: Chapter 14 problems and Exercises Chapter 15: Prs: 1-4; Exs: 1-5

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