But thunder is heard a few seconds after the flash is seen‚ why? How does the speed of sound in air vary with rise in density of the medium? 6. The volume of 50 g of a substance is 20 cm. If the density of water is 1g/cm‚ will the substance float or sink? 7. What are polyatomic ions? Give any two examples. 8. Archimedes could find the purity of a king’s crown using buoyancy. How? 9. a. If an element M has mass number 27 and atomic
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1. Which of the following polyatomic ions have a 3-ionic charge? a. Phosphate b. Hydrogen carbonate c. Sulfate d. Hydroxide e. Nitrate 2. In which of the following is the metric unit paired with its correct abbreviation? a. Centimeter/km b. Kilogram/cg c. Millimeter/mL d. Microgram/mg e. Gram/gm 3. The number of electrons in an ion with 20 protons and an ionic charge of 2- is? a. 22 b. 18 c. 20 d. 16 e. 24 4. Which of the following is a measurement of mass in the metric system
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Lecture 1 - Introduction to Geology GEOLOGY - study of the earth‚ its origin‚ history‚ materials‚ processes and resources Geology as a discipline: a. relevance of time‚ b. issue of scale‚ c. complexity of replicatingnatural systems in the laboratory Main Branches: 1. Physical - study of Earth materials and processes> Volcanology‚ Seismology‚ Environmental Geology‚ Engineering Geology‚ Mining Geology‚ Petroleum Geology‚ Mineralogy‚ Petrology‚ Geomorphology‚ Geophysics‚ Geochemistry‚ Planetary
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advertised tour company as well as signing the waiver making this enforceable. During the water rafting‚ the raft turned over and Hal and two other persons drowned. The Rafting Company fitted each person on the raft with a life jacket with “normal adult buoyancy rating”. According to Provincial Authorities a more suitable life jacket would probably not saved Hals life because of swiftness of river at accident site Hillary’s Arguments: The agreement should be void as both Hillary & Hal were under duress
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character Alex must confront real life problems and surpass them. The most compelling part of the film was the idea of being or staying “buoyant;” the desire to maintain composure and overcome distress. One of the most exceptional examples of buoyancy in the film is the skate-park‚ paranoid park‚ itself. Handfuls of rejected children end up practically living and surviving at Paranoid Park. The skate-park was the only place where they felt the emotions associated with a home‚ such as community
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weighed a lot were invented along with tubes and air tanks. This is just a small amount of scuba diving equipment history. Today we have come a long way with diving equipment. We now use BCD’s. A BCD stands for buoyancy control device that you can inflate and deflate to maintain buoyancy while diving. We have dive computers to tell us how deep we are diving‚ the time‚ how much air we have in our tanks and what direction we are heading. We have regulators to keep us breathing under water‚ which is
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how things happen and why. Swimming displays some physical properties‚ such as buoyancy‚ drag resistance and propulsion. We swimmers are at a constant battle to stay afloat‚ while fighting through the water and propelling ourselves forward‚ and we do so using technique. Buoyancy is the power to float or rise in a fluid. This relates to swimming because when you’re in the water‚ you have to be able stay afloat. Buoyancy is the net upward force acting on the swimmer‚ as the depth of the water increases
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------------------------------------------------- Pendulum From Wikipedia‚ the free encyclopedia This article is about pendulums. For other uses‚ see Pendulum (disambiguation). "Simple gravity pendulum" model assumes no friction or air resistance. | An animation of a pendulum showing the velocity and acceleration vectors (v and a). | | A pendulum is a weight suspended from a pivot so that it can swing freely.[1] When a pendulum is displaced from its restingequilibrium position‚ it is subject
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Abstract: Saponification is an esterification process that is used to make so from the hydrolysis of fats and oils. This process have the glycerol molecule‚ and a sodium carboxylate salt in most case sodium stearate being formed‚ however this salt depends on the base being used. In the experiment 23ml of vegetable oil was mixed with 20ml of ethyl alcohol along with 20 ml of 25% sodium hydroxide in a 250-mL Erlenmeyer flask. The content was then heated on a water bath whilst gently mixing with
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surfboard. I aspire to obtain more knowledge on the science behind shaping a surfboard. Professional and recreational surfers look for a surfboard that will enhance their performance. For many‚ this means less drag‚ a balanced lift‚ and more or less buoyancy‚ depending on their preferences.
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