# Plab1 - Introductory Mechanics Problems Laboratory Sears...

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Introductory Mechanics Problems Laboratory 1 Sears Tower Goals: Identify steps in a problem. Use reasonable guesses to make approximations. Use unit conversion to get an answer. PROBLEM The Sears Tower in Chicago is the tallest building in North America. As a scientist riding with a tour group you are asked if you know how many people work and visit there each day. Another tourist asks about how many liters of water are used each minute by the Tower during the day. You don’t have a web site handy, but you know a couple of facts. The tour guide tells you that the building is 110 stories high and sits on one city block (1/16 mile square). From the bus you see this view of the Tower: (picture from Trizec Properties).

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2 Sears Tower PROBLEM SKILLS There are two questions directly posed by the problem. The first is estimating the num- ber of workers in the building. The second is estimating the amount of water used by those workers. In general a step represents a simple mathematical expression. This can be a simple addition, subtraction, multiplication or division. Sometimes a step will correspond to a single formula. In estimation problems a step probably includes rounding or order of magnitude approximations. How do we break down steps? Usually there is a formula that we think applies to the
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## This note was uploaded on 10/02/2009 for the course PHYS 253 taught by Professor Staff during the Spring '08 term at Northern Illinois University.

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Plab1 - Introductory Mechanics Problems Laboratory Sears...

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