HW1 - Homework 1: Due at the beginning of class 09/09/2011...

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Homework 1: Due at the beginning of class 09/09/2011 Problem 1-2. The bookstore’s potential energy and power In a bookstore, there are lots of books. For each book, some work (against gravity) is already done to put the book on a bookshelf. If a book falls off the shelf, this potential energy is turned into kinetic energy. Problem 1. Each book has potential energy, which is then converted to kinetic energy during the falling. When a book hits the floor, what happens to the kinetic energy? (Hint: we know that energy is conserved, so it must go somewhere . . . ) Problem 2. If a book weighs 0.5 kg, there are 20 books on a shelf and 100 shelves in the bookstore, how much potential energy is there in the bookstore (in terms of the above potential energy of the books on shelves)? Assume that the acceleration due to gravity (a.k.a. g ) is 10 m/s 2 and that the shelves are all 1 m high. 1 Joule = 1 kg × 1 m/s 2 × 1 m. Problem 3.
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This note was uploaded on 09/25/2011 for the course CH 353M taught by Professor Lim during the Fall '08 term at University of Texas at Austin.

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HW1 - Homework 1: Due at the beginning of class 09/09/2011...

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