StoneTools A stone tool is‚ in the most general sense‚ any tool made either partially or entirely out of stone. Although stone tool-dependent societies and cultures still exist today‚ most stone tools are associated with prehistoric‚ particularly Stone Age cultures that have become extinct. Archaeologists often study such prehistoric societies‚ and refer to the study of stone tools as lithic analysis. Stone has been used to make a wide variety of different tools throughout history‚ including arrow
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Calculating the Enthalpy Change of Reaction for the Displacement Reaction between Zinc and Aqueous Copper Sulphate Data Collection and Processing Observations: * Drops of water left on the inside of the measuring cylinder * Hole in the lid‚ possible escape route for gas or splash-back * The polystyrene cup felt warm during the reaction By extrapolating the graph we can estimate what the rise in temperature would have been if the reaction had taken place instantaneously. I can
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The Feasibility of Using Plastic and Glass to Produce an Earthquake Resistant and Fire Retardant Hollow Block Chapter 1 Introduction: Most people believed that plastics and glass are one of the main wastes every day‚ but they don’t know that these wastes may help lessen the damages of different catastrophes specifically earthquakes and fires through a hollow block that used in building infrastructures. What is the difference between a commercial cement block to a hollow block mainly composed
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TYPES OF MAGNETIC MATERIALS Paramagnetic materials have a small‚ positive susceptibility to magnetic fields. These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons‚ and from the realignment of the electron paths caused by the external magnetic field. Paramagnetic materials include magnesium‚ molybdenum‚ lithium‚ and tantalum
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The Plastic Age is going strong. Plastic rules our lives and how! It’s durable‚ does not perish‚ and you don’t need to cut trees to make it. And despite being much frowned upon and debated‚ plastic has a strong presence in almost every nook of our lives. So deep is the plastic connection that we use the term to refer to anything fake — plastic smile‚ plastic snow‚ plastic surgery! Imagine‚ if the Titanic were made of plastic‚ it may never have sunk. So while we battle plastic bags choking our drains
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The Medium is the Message There are many things that fill our heads other than our own thoughts in today’s society. Things like social networking sites keep people all over the world updated on the latest fashion trends and technology. While things like ad’s and billboards spread advertisements as far the eye can see. The media is everywhere‚ and it has a great influence on our lives. As said by Marshall McLuhan‚ “Our conventional response to all media‚ namely that is how they are used that counts
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------------------------------------------------- Say no to plastics — Presentation Transcript * 1. SAY NO TO PLASTICS By Dibakar Bose * Plastics is one of the few new chemical materials which pose environmental problem. Polyethylene‚ polyvinyl chloride‚ polyester is largely used in the manufacture of Plastics Plastics is the general common term for a wide range of synthetic or semi synthetic organic solid materials suitable for the manufacture of industrial products .Plastics are typically polymers of high molecular
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You have enough money to buy a house or a business. Which would you choose to buy? Give specific reasons to explain your choice. Someone prefers to buy a house when she/he has enough money. Others would like to set up their own business instead. After considering‚ I decide to buy a new house because It has more advantages. The main reason is that it will make many benefit to our lives. If you purchase a new house‚ you will have space to do your private business. When you hire a house or apartment
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Hardware Tools A. Electrostatic Discharge(ESD) 1. Antistatic Wrist Strap-An antistatic wrist strap‚ ESD wrist strap‚ or ground bracelet is an antistatic device used to safely ground a person working on very sensitive electronic equipment‚ to prevent the buildup ofstatic electricity on their body‚ which can result in electrostatic discharge (ESD). It is used in the electronics industry by workers working on electronic devices which can be damaged by ESD‚ and also sometimes by people working around
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Engineering materials Choice of materials for a machine element depends very much on its properties‚ cost‚ availability and such other factors. It is therefore important to have some idea of the common engineering materials and their properties before learning the details of design procedure. Common engineering materials are normally classified as metals and nonmetals. Metals may conveniently be divided into ferrous and non-ferrous metals. Important ferrous metals for the present purpose
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