weight greater in air than in the liquid. Therefore‚ it is easier to lift a body in a liquid than in the air. ii. Steel balls sink in water but don’t sink in mercury. Why? ~ The density of the water is less than that of mercury. Also‚ the density of the steel is greater than that of water but less than that of mercury. Hence‚ mercury provides greater upthrust than water does resulting the floatation of the steel in it. iii. A body floats in a liquid contained in a beaker. The whole system
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more than a century. In fact‚ the first written record of amalgam being used in dental applications is 1528 .Yet‚ it is still a very commonly used material today. Amalgam was first made by melting down Spanish or Mexican coins and mixing them with mercury . When it cooled and settled into the cavity‚ it actually turned black. Bell then evolved this rudimentary procedure into a more controlled alloy in 1819. The substance created a massive wealth for the dental surgeons who promoted its use. However
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of our solar system. It contains almost all of the mass in our solar system and exerts a tremendous gravitational pull on planets and other bodies. 3. Our solar system formed about 4.6 billion years ago. 4. The four planets closest to the Sun - Mercury‚ Venus‚ Earth‚ and Mars - are called the terrestrial planets because they have solid‚ rocky surfaces. 5. Two of the outer planets beyond the orbit of Mars - Jupiter and Saturn - are known as gas giants; the more distant Uranus and Neptune are called
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Assignment # 1: The monumental size and complexity of the Tomb of Shihuangdi is astounding burial place. Kenneth Wirlen HUM 111 Dr. Jacqueline Stra World Cultures 1. July 22nd 2013. Strayer University Takoma Park. 1. Clearly state the “mystery” and provide a brief summary of at least two (2) theories which could explain the mystery. Because some theories may sound far-fetched‚ include the source or promoter of each theory – such as a scientist‚ a historian‚ a theologian‚ etc. It is believed
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RELAY A relay is an electrically operated switch. Many relays use an electromagnet to operate a switching mechanism mechanically‚ but other operating principles are also used. Relays are used where it is necessary to control a circuit by a low-power signal (with complete electrical isolation between control and controlled circuits)‚ or where several circuits must be controlled by one signal. The first relays were used in long distance telegraph circuits‚ repeating the signal coming in from one circuit
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McCarthy‚ linking the vaccinations to the time their child started developing symptoms of autism. Early on‚ questions were raised about the mercury in the vaccinations. Since then‚ the mercury has been taken out of the vaccines but autism still continues to rise. In her interview with Time magazine‚ Ms. McCarthy stated "We don’t believe it’s only the mercury. Aluminum and other toxins also play a role. The viruses in the vaccines could be causing it‚ too." I found a study published in 2011‚ in
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fillings offer various advantages over amalgam. The majority of today’s patients will choose white fillings over silver. The reason for that is the mercury in the amalgam is often viewed as potentially toxic and cause sensitivity. Depending on which tissue it settles in‚ it will differ from one person to another. The suggested answer is that mercury from fillings doesn ’t cause a specific disease. It causes poisoning‚ and a very small number of people are allergic to metals in the amalgam and may
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India: Dumping Ground For Developed Countries? By Chaitanya Gaikwad M.Sc. Environmental Science Paper presented at Vasantdada Sugar Institute (VSI)‚ Pune‚ India Basel Convention Convention on the Control of Transboundary Movements of Hazardous wastes and their Disposal In the late 1980s‚ a tightening of environmental regulations in industrialized countries led to a dramatic rise in the cost of hazardous waste disposal. Searching for cheaper ways to get rid of the wastes‚ “toxic traders”
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Across the Universe A Virtual Field Trip Through Our Solar System… And Beyond [pic] [pic] INTRODUCTION We are about to embark on an extended and exciting journey that will take us from our home planet Earth‚ through our solar system‚ and finally to some of the most unusual and exotic places in the universe. In most cases‚ the places we will be visiting will be hundreds of billions or even trillions (that’s 1 with 12 zeroes after
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The Good‚ the Bad and High Fructose Corn Syrup Considered natural‚ corn syrup in essence is a sugar; it is a sugar made from corn. I would reckon that most folks think that high fructose corn syrup (HFCS) is just another additive of food ingredients and never give it a second notion. I was once like that as well; it was not until about two years ago I realized that corn syrup was somewhat controversial. Now‚ after reading Michael Pollan’s The Omnivore’s Dilemma‚ I realize just how controversial
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