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 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?

Work You push a crate across a rough floor with a force of 565 N pushing down at an angle of How much work do you do pushing the crate 4.5 meters? 30 0

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.

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?

Problem 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?