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Lecture 33

Lecture 33. Review for Exam 4. It takes 40 calories of fossil fuel to produce 1 calorie of food on your table. Make Up Laboratory. If you signed up for a makeup lab, remember to go to it this week. You must have signed up in advance by Friday, November 21. Problem 7: 33.

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Lecture 33

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  1. Lecture 33 Review for Exam 4

  2. It takes 40 calories of fossil fuel to produce 1 calorie of food on your table.

  3. Make Up Laboratory • If you signed up for a makeup lab, remember to go to it this week. You must have signed up in advance by Friday, November 21.

  4. Problem 7: 33 • What is the angular momentum of a 2.0 kg, 4.0 cm-diameter disk rotating about an axis perpendicular to the disk through its center?

  5. Work • You push a crate across a rough floor with a force of 565 N pushing down at an angle of 300. How much work do you do pushing the crate 4.5 meters? 300

  6. Simple Harmonic Oscillator • A mass of 200g is hung on a vertical spring. The spring stretches 20.5 cm. What is the spring constant? • The mass is now pulled down 5 cm further and released from rest. At what frequency does it oscillate? • Sketch the position of the oscillator as a function of time.

  7. Oscillator continued • What is the amplitude of the oscillation? • What is the position at t=0.55s ? • At what time is the oscillator at rest? • What is the maximum velocity of the mass?

  8. Problem 10.24 • A student places her 500 g physics text book on a frictionless table. She pushed the book against the spring, compressing it 4.00 cm. What is the book’s speed as it slides away?

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