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The maximum power that can be extracted by a find turbine

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 58P Chapter 20

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 58P

The maximum power that can be extracted by a find turbine from an air stream is approximately P? =? ? ?u?3 where ?d is the blade diameter, ?u is the wind speed, and the constant ?k = 0.5 W · s3/m5. (a) Explain the dependence of ?P on ?d and on ?u by considering a cylinder of air that passes over the turbine blades in time ?t (Fig.). This cylinder has diameter ?d?, length L = ?u?t, and density ?. (b) The Mod-5B wind turbine at Kahaku on the Hawaiian island of Oahu has a blade diameter of 97 m (slightly longer than a football field) and sits atop a 58-m tower. It can produce 3.2 MW of electric power. Assuming 25% efficiency, what wind speed is required to produce this amount of power? Give your answer in m/s and in km/h. (c) Commercial wind turbines are commonly located in or downwind of mountain passes. Why? Figure:

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The Psychology of Problem Solving Problem Solving Active efforts to achieve a goal Types of problems: ● Structure problems ­ Find relationships ● Arrangement problems ­ Arrange to satisfy a goal ● Transformation problem ­ Carry out a sequence of transformation What screws us up 1. Irrelevant Information 2. Function fixedness 3. Mental set 4. Unnecessary constraints Approaches to Problem Solving 1. Trial & error ­ Repeat until success 2. Heuristics ­ Using experience to learn a. “Rule of thumb” 3. Forming subgroups ­ Breaking problems down into many smaller parts 4. Working backward ­ Solving problems starting from the end 5. Search for analogies ­ Search for solutions that had worked before 6. Change the representation Risky Decision Making Factors: ● Objective value ­ The value is within itself ● Subjective utility ­ A decision based on the individual’s cost and benefit. ● Subjective probabilities ­ An individual’s judgment on whether an outcome is going to occur. Common Probability Bloopers Availability bias ­ How quickly it comes to mind Representativeness bias ­ A tendency that seems more typical, it is more probable Ignoring base rates ­ Make a judgment on the outcome without considering prior knowledge of the probability The conjunction fallacy ­ More probability for one group, then one group + another group The gambler’s fallacy ­ Increase chance if the result happen before hand Ignoring sample size ­ Choose the smaller sample size that fits the condition The Psychology of Language Acquisition 3 Criteria of Language 1. Symbolic 2. Structured 3. Infinitely generative Structure of Language Phonemes ­ Very small unit of sound Morphemes ­ Very small unit of meaning Syntax ­ Use a series of words to create a sentence The vocabulary spurt: 18 months Example Sentence: The boys cried Word: 3 Morphemes: 5 (The / boy/s / cri/ed) Phonemes: 9 (Th/e / b/oi/z / k/r/i/d) Language Acquisition Babbling ­ Make phonemes (Make different sounds) Holophrases ­ Able to communicate with one word that will act as a sentence Telegraphic speech ­ Make a sentence out of two words. (noun and verb) Whole sentence ­ Make sentences grammatically correct Metalinguistic awareness ­ Realization of language having more than one meaning. Theories of Language Acquisition Behaviorist ● Skinner ● Imitation, reinforcement Nativists ● Chomsky ● Innate Language Acquisition Device ● Original sentence ● Overregularization Language Shapes Thought Linguistic Relativity ­ refer to more words you know, the more complex it can be. Basically add adjectives before a noun. Framing ­ Study of how choice affect the person Semantic slanting ­ label use to bring emotion or numb emotion Language Comprehension Words recognition ­ Recognize written and spoken words correctly and virtually. Advantage of nonverbals ­ more information and understanding (body language) Extraneous Noise ­ Noise that don’t do anything to what you are saying; “um”, “you know” Animals Thinking Classical conditioning Operant conditioning Observational learning Rudimentary counting ­ being able to “count” the more “favored” portion for them. Limited insight ­ Be able to use the supply of what’s around to achieve a goal. Exhibit Language Communicate ​ Yes Language ​ No The animal did not meet the criteria of language.

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Chapter 20, Problem 58P is Solved
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Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

This textbook survival guide was created for the textbook: University Physics, edition: 13. The answer to “The maximum power that can be extracted by a find turbine from an air stream is approximately P? =? ? ?u?3 where ?d is the blade diameter, ?u is the wind speed, and the constant ?k = 0.5 W · s3/m5. (a) Explain the dependence of ?P on ?d and on ?u by considering a cylinder of air that passes over the turbine blades in time ?t (Fig.). This cylinder has diameter ?d?, length L = ?u?t, and density ?. (b) The Mod-5B wind turbine at Kahaku on the Hawaiian island of Oahu has a blade diameter of 97 m (slightly longer than a football field) and sits atop a 58-m tower. It can produce 3.2 MW of electric power. Assuming 25% efficiency, what wind speed is required to produce this amount of power? Give your answer in m/s and in km/h. (c) Commercial wind turbines are commonly located in or downwind of mountain passes. Why? Figure:” is broken down into a number of easy to follow steps, and 157 words. University Physics was written by and is associated to the ISBN: 9780321675460. Since the solution to 58P from 20 chapter was answered, more than 333 students have viewed the full step-by-step answer. This full solution covers the following key subjects: wind, power, diameter, turbine, passes. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. The full step-by-step solution to problem: 58P from chapter: 20 was answered by , our top Physics solution expert on 05/06/17, 06:07PM.

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