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Intro to Measurement Uncertainty 2011
Measurement Uncertainty and Significant Figures There is no such thing as a perfect measurement. Even doing something as simple as measuring the length of a pencil with a ruler is subject to limitations that can affect how close your measurement is to its true value. For example, you need to consider the clarity and accuracy of the scale on the ruler. What is the smallest subdivision of the ruler scale? How thick are the black lines that indicate centimeters and millimeters? Such ideas are important in understanding the limitations of use of a ruler, just as with any measuring device. The degree to which a measured quantity compares to the true value of the measurement describes the accuracy of the measurement. Most measuring instruments you will use in physics lab are quite accurate when used properly. However, even when an instrument is used properly, it is quite normal for different people to get slightly different values when measuring the same quantity. When using a ruler, perception of when an object is best lined up against the ruler scale may vary from person to person. Sometimes a measurement must be taken under less than ideal conditions, such as at an awkward angle or against a rough surface. As a result, if the measurement is repeated by different people (or even by the same person) the measured value can vary slightly. The degree to which repeated measurements of the same quantity differ describes the precision of the measurement. Because of limitations both in the accuracy and precision of measurements, you can never expect to be able to make an exact measurement. -
NARA's Specifications for Housing Enclosures for Archival Records
National Archives and Records Administration Archives and Preservation Resources Technical Information NARA's Specifications for Housing Enclosures for Archival Records (1991-1996) [Web Version] Introduction to Housing Enclosures for Archival Records Acid-Free Archives Box Letter and Legal Size Archives Box Spacer Boards Low Lignin Archives Box Low Lignin Document Storage Box Low Lignin Flat Storage Box Low Lignin Microfilm Box Low Lignin Photograph Storage Box Letter and Legal Size File Folders Note: This web version was prepared in 1999, based on: Specifications for Housing Enclosures for Archival Records, Preservation Information Paper Number 2, Published by the National Archives and Records Administration, Washington, DC, 1991-1996: 77 pages. This version may differ from the printed version. National Archives and Records Administration Archives and Preservation Resources Technical Information Introduction to Housing Enclosures for Archival Records A primary preservation goal is to house all records appropriately based on their size, format, and composition. Housing enclosures provide physical support and protection as well as a buffer against adverse or fluctuating environmental conditions. Housings also provide a mechanism for organizing and maintaining records in intellectual units that can be easily and safely handled. Factors that are considered when designing housings include the optimum method of accessing, storing, and using the records; stability of all component housing materials; method of fabrication or assembly; and cost. Given the importance of housings in an archives preservation program, the National Archives has devoted a great deal of attention to developing specifications. The attached specifications for boxes, folders, and spacer boards describe the physical and chemical properties of the component materials, design features, and workmanship criteria against which the finished products are evaluated. -
1201 Lab Manual Table of Contents
1201 LAB MANUAL TABLE OF CONTENTS WARNING: The Pasco carts & track components have strong magnets inside of them. Strong magnetic fields can affect pacemakers, ICDs and other implanted medical devices. Many of these devices are made with a feature that deactivates it with a magnetic field. Therefore, care must be taken to keep medical devices minimally 1’ away from any strong magnetic field. Introduction 3 Laboratory Skills Laboratory I: Physics Laboratory Skills 7 Problem #1: Constant Velocity Motion 1 9 Problem #2: Constant Velocity Motion 2 15 Problem #3: Measurement and Uncertainty 21 Laboratory I Cover Sheet 31 General Laws of Motion Laboratory II: Motion and Force 33 Problem #1: Falling 35 Problem #2: Motion Down an Incline 39 Problem #3: Motion Up and Down an Incline 43 Problem #4: Normal Force and Frictional Force 47 Problem #5: Velocity and Force 51 Problem #6: Two-Dimensional Motion 55 Table of Coefficients of Friction 59 Check Your Understanding 61 Laboratory II Cover Sheet 63 Laboratory III: Statics 65 Problem #1: Springs and Equilibrium I 67 Problem #2: Springs and Equilibrium II 71 Problem #3: Leg Elevator 75 Problem #4: Equilibrium of a Walkway 79 Problem #5: Designing a Mobile 83 Problem #6: Mechanical Arm 87 Check Your Understanding 91 Laboratory III Cover Sheet 93 Laboratory IV: Circular Motion and Rotation 95 Problem #1: Circular Motion 97 Problem #2: Rotation and Linear Motion at Constant Speed 101 Problem #3: Angular and Linear Acceleration 105 Problem #4: Moment of Inertia of a Complex System 109 Problem #5: Moments -
AU2260XA Model No
Shredder User Manual 1-800-327-8508 USA Only 1-310-793-5650 International Email: [email protected] For more information, please visit us at: AU2260XA www.auroracorp.com Model No. Please read these operating instructions before using the unit. WARNING: SAFETY INSTRUCTIONS, READ BEFORE USING! Read instructions before use. Do not spray or keep any aerosol products in or around the shredder. Avoid touching the document Keep loose clothing or jewelry feed opening with hands. away from the paper entry slot. Product is not intended for use by Avoid getting hair near the children (product is not a toy). paper entry slot. Do not insert foreign objects into the paper entry slot. Keep away from moving parts. • Always turn the shredder off and unplug the power cord from the AC outlet when not in use, before cleaning, moving, or emptying the waste basket. • RISK OF FIRE. Never use any petroleum based or flammable oils or lubricants in or around the machine as some oils can combust causing serious injury. • NEVER dispose of flammable chemicals or materials that have come into contact with flammable chemicals (for example, nail polish, acetone and gasoline) in the shredder basket. • Never shred metal credit cards, large paper clips, window or insulated envelopes, continuous forms, newsprint, bound pages (for example: notepads, checkbooks, magazines, etc...), transparencies, laminated documents, cardboard, any items with adhesives, hard materials or plastic (except plastic Credit Cards and CDs). • Do not hold CD/DVD with finger through the center ring while feeding into the shredder. Serious injury may occur. • A socket-outlet should be near the equipment and be easily accessible. -
Stride Ruler Use Your Own Two Feet to Estimate Distances
www.exploratorium.edu/geometryplayground/activities Stride Ruler Use your own two feet to estimate distances. Materials Background • playground or other paved You don’t always need a precise answer. A well-informed guess—an estimate—is surface often good enough. For example, you can estimate the time it will take you to walk • 4 metersticks to a neighborhood store and back. Your estimate may differ from the actual time by • masking tape a few minutes, but it will tell you if you have time go to the store and be back by • pencil dinnertime. Estimating distances is often useful, too, and that’s what you’ll find out • clipboard or book to create a how to do in this activity. sturdy writing surface Try This Group Size 1. Two volunteers should lay the metersticks end to end in a straight line on the whole group pavement, placing the 1-cm end of a meterstick against the 100-cm end of the previous one. Tape the metersticks securely to the pavement. Then tape a “start Related Activity line” perpendicular to the beginning of the first meter stick. Everyone should • Measuring and Mapping the take a turn doing the rest of the steps. Playground Did You Know? No measurement is exact. In a 4. sense, every measurement you 3. make is an estimate, no matter 2. how carefully you measure. (It’s been said, in fact, that while 1. counting is difficult, measuring is impossible!) St art Line 2. Put your toes just behind the “start line.” Take 10 “baby steps” forward, walking right next to the line of metersticks. -
Measurements
Measurements INTRODUCTION Physics is a quantitative, experimental science that relies heavily on the ability to perform accurate, precise measurements. In this experiment, the basic techniques for making measurements and for analyzing data will be introduced. The physical characteristics of length, mass, volume, and density will be measured. THEORY In measuring physical quantities, it is important to use the proper measuring instruments. Often the degree of precision desired for a particular measurement determines the type of equipment that should be used. For measuring linear dimensions such as length, width, or height, there are two types of common instruments available: the straight-edged ruler and the caliper. The caliper consists of two jaws, one fixed and one movable, used to determine the distances between two surfaces or to measure the diameters of small objects. Note: The measurement error associated with each device is normally about half of the smallest dimension that the instrument is capable of measuring. The Digital Caliper Figure 1: Digital caliper The digital caliper consists of one fixed jaw, attached to a main beam, and one movable jaw that slides along the main beam. The instrument that we will be using in lab for these measurements can be set to readout in either English or metric units. The distance between the two measurement jaws is displayed on the LED digital readout display located on the slider. When measuring a linear dimension using the digital caliper, the workpiece is placed between the jaws, as close as possible to the main beam, and the jaws are closed making contact with the workpiece. -
Letter and Legal Size File Folders October 2015
Specifications for Letter and Legal Size File Folders October 2015 I. Scope This specification covers the requirements for letter and legal size file folders. II. Requirements Construction The file folder shall be made from a single piece of paperboard folded along a primary score line. It shall contain two additional score lines positioned on the front flap and shall have a reinforced top margin on the back flap. The folder shall have straight sides that meet evenly (when the folder is folded) with rounded corners on both the front and back flaps. (See Figure 1) Figure 1 - Configuration of Letter or Legal Size File Folders 1 RXC Specifications for Letter and Legal Size File Folders (Oct. 2015) Dimensions Letter Size Folder A letter size file folder, folded along the primary score line, shall measure 85/8“ in height (front flap), 95/8” in height (back flap), and 11¾” in width. The allowable variation for each dimension shall be ±1/16”. Legal Size Folder A legal size file folder folded at the primary score line shall measure 85/8” in height (front flap), 95/8” in height (back flap), and 14¾” in width. The allowable variation for each dimension shall be ±1/16”. Score Lines on the Front Flap For both letter and legal size folders, the first score line shall be 3/8” away from the primary fold. The second score line shall be ¾” away from the primary fold. Top Margin on the Back Flap For both letter and legal size folders, the top margin on the back flap shall measure 13/8”, ±1/16”. -
Filing Systems & Supplies
Filing Systems & Supplies SPECIFICATION GUIDE www.tab.com Terms and Conditions Terms: Net 30, FOB ship point with freight prepaid by TAB and added to the Recycled Content: invoice. Call customer service for shipping options and prices. Payment terms and • 11, 14, and 18 Pt. Manila 10% remit to addresses are stated on invoice. Consumer Material (PCM). • 11 & 14 Pt. Color 20% PCM. Minimum Order Value: If the value of product(s) to ship from TAB’s • 11 & 17 Pt. Kraft 10% PCM. warehouse is less than $25.00, an up-charge will be added to raise that total order • Pressboard: value not including tax and freight to $25.00. Type I 50% Recycled, 30% PCM. Type II 70% Recycled 25% PCM. Minimum Order Quantity: Select custom products have minimum order Type III 50% Recycled, 20% PCM. quantities. Custom Products: TAB specializes in making custom folders and pockets. Split Box Shipments: Products are listed with box and carton quantities. Most custom folders can be priced by referring to the Value Added Stock Products Orders for less than a full box will automatically be increased to the next full box section in this guide. If the desired product is not in our catalog call us at 800-827- quantity and the price will be increased accordingly. 3288 for assistance and press option 3, or email [email protected] for our Paper Returns: Absolute Guarantee allows you to return any stock product that does and Supplies Customer Service. not meet your expectations, within 90 days, for any reason. All returns must be pre- Over Runs or Under Runs: We attempt to ship exact quantities as approved by Customer Service. -
Answer Key • Lesson 1: M, Dm, Cm, Mm
Answer Key • Lesson 1: m, dm, cm, mm Student Guide Questions 1–23 (SG pp. 448–452) m, dm, cm, mm Meters (m) 1. Yes Your teacher made marks 1 and 2 meters above the floor. Use these marks to help you 2. No answer the questions below. 1. Are you more than 1 meter tall? 3. Answers will vary. 2. Are you more than 2 meters tall? 3. Are you closer to 1 meter or 2 meters? 4.* A sample class data table follows (Figure 1 4. Measure objects around the classroom to the nearest whole meter. The symbol for from lesson). meter is m. Keep track of the data on the Class Measurement Tables in the Student To the Nearest Meter Activity Book. To the Nearest Meter Measurement Measurement Object Object (nearest m) (nearest m) Height of door Copyright © Kendall Hunt Publishing Company Height of door 2 m Width of classroom Length of Width of classroom 8 m classroom Width of chalkboard Length of classroom 14 m Length of paper clip Width of chalkboard 5 m Length of pencil Length of paper clip 0 m Length of pencil 0 m 5. A measurement of 0 m tells you the object is less than 0.5 m long. Centimeters or 448 SG • Grade 4 • Unit 10 • Lesson 1 m, dm, cm, mm decimeters are more appropriate units. 6. Two possible answers: a pencil and the Student Guide - Page 448 diameter of a nickel. 7. Two possible answers: The length of a room and the height of a building. 5. -
Measurements Purpose Equipment Discussion
rev 05/2019 Measurements Purpose To learn the proper use of a meterstick, vernier caliper, micrometer, and electronic scale, and to learn how to use the correct number of significant figures in data and results. Equipment Meterstick, 2-meterstick, vernier caliper, micrometer, laboratory balance, ruler, metal cylinder. Discussion The number of significant figures in a measurement depends on the measuring device and its precision. When an object is measured in a same manner, a vernier caliper has a greater precision than a meterstick and a micrometer has a greater precision than a vernier caliper. A measurement reading should have one more significant figure than the smallest subdivision marked on the scale. 2 (Main scale) 3 0 (Vernier scale) Alignment at 7 2.1 cm + 0.070 cm = 2.170 cm (main scale at vernier 0 mark) (vernier scale) Vernier Caliper. Example of reading: The main scale gives a reading to 1/10 of cm at the 0 mark on the vernier scale. The next digit (the second decimal place in cm) is made on the vernier scale where the marks line up. If a mark on the vernier scale is aligned with a mark on the main scale as in the first example, the mark on the vernier scale gives the next digit and the estimated figure is 0. 1 2 (Main scale) 3 0 (Vernier scale) No alignment. Phase change for 2 and 3 marks. 2.0 cm + 0.025 cm = 2.025 cm (main scale at vernier 0 mark) (vernier scale) Example 2: If no marks are aligned, there is a phase change between marks. -
Files and File Folders RING BINDERS RING BINDERS
Files and file folders RING BINDERS RING BINDERS Size – А5, Size – А4, Size – А4, Size – А4, Size – А4, 2 rings 2 rings 4 rings 2 rings 4 rings 3,49 BGN/pcs 3,99 BGN/pcs 5,49 BGN/pcs 10,99 BGN/pcs 12,99 BGN/pcs 1070140010 1070140020 1070140030 1070140040 1070140041 1070140011 1070140021 1070140031 1070140012 1070140022 1070140032 Pocket on the spine Pocket Internal pocket » Polyppopylene coated file covers. » D-shaped rings. » Spine width – 38 mm. » Spine width – 100 mm. » D-shaped rings. » White PP coated file covers. » Replaceable label pocket on the spine. » Suitable for presentations, preparation of catalogs and others. BANK LEVER ARCH FILE HORIZONTAL LEVER ARCH FILE Size – А5, 8 cm Size – А3, 8 cm PRICES IN BGN, VAT EXCLUDED PRICES IN BGN, VAT 3,99 BGN/pcs 9,99 BGN/pcs 1070120090 1070120096 1070120091 » PP coated file covers. » Durable locking mechanism. » PP coated file covers. » Replaceable label pocket on » Durable locking mecha- the spine. nism. » Reinforced botton edge. » Replaceable label pocket on the spine. LEVER ARCH FILE WITH REPLACEABLE LABEL » PP coated file covers. » Durable locking mechanism. » Replaceable label pocket on the spine. Back 8 cm 2,99 BGN/pcs Back 5 cm 1070120120 Black 1070120140 1070120121 Blue 1070120141 1070120122 Red 1070120142 1070120123 White 1070120143 1070120124 Green 1070120144 92 Files and file folders PRICES IN BGN, VAT EXCLUDED PRICES IN BGN, VAT COLOR LEVER ARCH FILE WIDTH 8 cm 3,99 BGN/pcs WIDTH 5 cm 1070120460 Black 1070120476 1070120461 Blue 1070120477 1070120462 Red 1070120478 1070120463 Green 1070120479 1070120464 Yellow 1070120480 1070120465 Lavender 1070120481 1070120466 Purple 1070120482 1070120467 Pink 1070120483 1070120468 White 1070120484 1070120469 Dark blue 1070120485 1070120470 Light green 1070120486 » Polyppopylene coated file covers. -
Paper Kraft Inc About Us
+91-8048372478 Paper Kraft Inc https://www.indiamart.com/paperkraftinc/ About Us Established in the year 1996 at Mumbai, Maharashtra, we “Paper Kraft Inc" are Sole Proprietorship (Individual) based firm, involved as the Wholesale Saller of Paper Roll, Kraft Roll, Thermal Paper etc. All our products are getting widely acclaimed among the large clientele for their exclusive designs, superior quality, and reliability. Apart from this, our ability to maintain timelines as well as quality in the assortment, providing cost effective solutions and assurance to make timely shipment of the orders placed by customers have assisted us positioning our name in the list of top-notch companies of the industry. For more information, please visit https://www.indiamart.com/paperkraftinc/about-us.html KRAFT ROLL O u r P r o d u c t s Imported Brown Kraft Paper Imported Kraft Paper Roll Roll Imported Kraft Paper Roll Imported Kraft Paper PAPER ROLL O u r P r o d u c t s Imported Paper Roll Core Imported Brown Kraft Paper Pipe Roll Imported Packaging Paper Imported Ribbed Kraft Paper Roll Roll COATED PAPER O u r P r o d u c t s Imported C1S Paper Imported Cast Coated Paper Imported Double Side Coated Silicone Coated Release Liner Paper SELF ADHESIVE PAPER O u r P r o d u c t s Self Adhesive Paper Adhesive Paper Self Adhesive Paper for Digital Gumming Sheet Printing GLOSSY PHOTO PAPERS O u r P r o d u c t s High Glossy paper Glossy Papers Glossy Card Paper GLOSSY PAPER O u r P r o d u c t s Smooth Finished Glossy Glassine Paper For Adhesive Paper Coated Chromo