# lab 3 - Lab#3 Measurement and Method Dustin Johnston...

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Lab #3 Measurement and Method Dustin Johnston Physics 118 Spring 2008 Introduction This lab was based on learning how the scientific method could be used to gain knowledge about a physical system and the properties of that system without making direct measurements. This is commonly used in the field of physics when measuring items that are normally two small or to abstract for it to be feasible to use direct measurement. For example when measuring the diameter of a atom or its parts, using a caliper to directly measure its diameter is not feasible. The most common way of indirectly measuring items that are two small to be directly measured is though a technique formally known as the Monte Carlo integration, in which smaller items with a known area are dropped upon the item. By doing this you can estimate the area of the unknown item by comparing the amount of space not covered by the object(s) and the area that is covered. Procedure During this lab we used washers with two different diameters (approx. 3/4" and 1/2"), a ruler, calipers (to determine the diameter of the wasters) and the Sam Houston lab manual. This experiment consists of two parts followed by a series of questions. Before beginning gather all the needed materials, ensuring that you gather a sufficient number of washers to completely cover the entire surface of the figures we will be measuring. The first part of this experiment will be to measure the area of a rectangle using the Monte Carlo integration to do this use the square in this lab (figure 2.). First drop a handful of the larger (3/4") washers onto the square ensuring that not to many of the washers bounce outside the box and that you do not have to many washers and they overlap each other to much, this could take several trials, repeat as many times as needed to find the ideal amount of washers needed. After a sufficient amount of practice, take the handful of washers and drop them on the square again, this time instead of removing all the washers, only remove the washers that are completely outside of the square. Don't remove the washers that are partially inside the square

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## This note was uploaded on 06/20/2011 for the course ECO 233 taught by Professor Gonzales during the Spring '08 term at Sam Houston State University.

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lab 3 - Lab#3 Measurement and Method Dustin Johnston...

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