Discuss two limitations of Kevlar‚ despite its apparent strength. Kevlar’s main weaknesses are that it decomposes under alkaline conditions or when exposed to chlorine‚ it is not strong under pressure (compressive stress) and its sensitive to ultraviolet light. Even with these weakness‚ people don’t abandon
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industrial productions. When the products employed they floated up into the earth’s atmosphere and turned into chlorine‚ thus breaking down the ozone layer. The ozone layer is a deep layer in the stratosphere that protects the earth from harmful ultraviolet radiation by absorbing them within the oxygen atoms. Not until 1978 did these researchers propose a ban against the release of fluorocarbons into the earth’s atmosphere. The facts that are supported within the speech are the probable evidence
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other‚ ultraviolet. Based on Figure 1.1 and on what you have learned about Niels Bohr’s model of atom‚ account for the difference in energy between these lines. (3 marks) Answer: The line which is on the visible portion of spectrum is produced when electron is jumping from higher to lower energy level orbit thus releasing energy and electromagnetic waves featuring longer wavelengths‚ which mean that these lines are lower in energy compared to line which is emitting on ultraviolet portion
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concentrations of ozone‚ located at altitudes of 12-30 mi (19-48 km) above the earth’s surface. Ozone in the ozone layer is formed by the action of solar ultraviolet light on oxygen. The ozone layer prevents most ultraviolet (UV) and other high-energy radiation from penetrating to the earth’s surface but does allow through sufficient ultraviolet rays to support the activation of vitamin D in humans. The full radiation‚ if unhindered by this filtering effect‚ would destroy animal tissue. Higher
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have been established for the recommended purchase of a new printing press are as follows: 1. Price must not exceed our $500‚000 budget limit. 2. Press capacity must be 10‚000 impressions per hour. 3. Available options must include ultraviolet dryers‚ computer control console‚ and automatic register systems. 4. Maximum sheet size must be 52 inches. 5. Press size must be less than 6‚000 square feet and its weight no more than 15‚000 pounds. Discussion The remainder of this
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1. Which of the following is not one of Kepler’s Laws of planetary motion? A) As a planet orbits the sun‚ it sweeps out equal areas in equal time. B) The closer a planet is to the sun‚ the slower it moves in its orbit. C) A planet’s orbit is an ellipse‚ with the sun at one focus. D) The more distant a planet’s orbit is from the sun‚ the longer it takes to complete an orbit. Table for Individual Question Feedback Points Earned: 1.0/1.0 Correct Answer(s): B 2. What are the three
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determine which of DNA is labeled‚ half-labeled or unlabeled. To this end‚ I will use c13 label the bacteria and abruptly change carbon source with C12. Then I will collect four samples in different time and analyze the results from centrifugal by ultraviolet absorption. According to the hypothesis above‚ I design the experiment below. Firstly‚ Escherichia coli B will grow 14 generations at 36° C. with aeration in a glucose salts medium which is the only carbon source and labeled with C13. Then I
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beneficial. The ozone is a major factor that makes life possible on Earth. About 90% of the planet’s ozone is in the ozone layer. Ozone in this layer shields and filters out the Earth from 95-99 percent the sun’s ultraviolet radiation. A low level of ozone does not protect or prevent the sun’s ultraviolet rays from reaching the surface of the Earth‚ therefore‚ overexposing life on Earth causing many diseases. The depletion of the ozone is caused by many factors‚ but the one cause that will be elaborated on
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Moles 1.How is molar mass calculated and why is it useful? You have to multiply the atomic weight of each element by the number of atoms that it contains in a compound. Molar mass is useful because its used to change a measurement of mass to an amount of a substance such as the number of particles. 2.Define a mole in chemistry and give 3 examples equivalent units that are used in chemical calculations. A mole measures the amount of a substance. Three examples that are equivalent to a mole is molar
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The electromagnetic spectrum is made up of six different types of waves. Radio waves‚ Microwaves‚ Infrared waves‚ Visible light‚ Ultraviolet light‚ X-rays and Gamma rays. The radio waves are used to transmit radio and television signals. The infrared waves are used to tell temperature of areas. Visible light is all the colors that we can see. Ultraviolet light can help things grow but to much can cause diseases such as skin cancer. X-rays are used as a tool to find broken bones or take pitchers
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