PS1 - Chemistry 135 Problem Set#1 Due Tuesday Please show...

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Chemistry 135: Problem Set #1 Due Tuesday September 28, 2010 Please show all the work and reasoning that is relevant. How you got your answer is often more important at than the answer itself. Also, I suggest you don’t “overthink” the problems. They are not meant to be complex, but just a simple (often “back of the envelope”) calculations relevant to work, energy, etc. Suggested reading: Chang, Chapter 1 and 3; Smith, Chapter 1; Levine Chapter 1 and 2.1 1. The library’s potential energy and power In the library, there are lots of books. For each book, someone has done work against gravity to put the book on a bookshelf. If a book falls off the shelf, this potential energy is turned into kinetic energy. (a) When a book hits the ground, what happens to the kinetic energy? (Hint: we know that energy is conserved, so it must go somewhere . . . ) (b) If a book weighs 1kg and there are 50 books on a shelf and 20 shelves in the library, how much potential energy is there in the library (in terms of books on shelves)? Assume that
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