Which members of the truss are zero-force members Solutionass.pdf

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Which members of the truss are zero-force members? Solution assuming all members to be weightless. at the joint E, the only force possible in the vertical direction is due to DE. so the vertical component of force in DE should be zero, because the joint E is at equilibrium. If the vertical component is zero means there is no force in that member; it is a pin jointed member and force will be along the bar and it is an inclined bar. if there is a horizontal component, there will be a vertical component. EF is a zero force member, because there is no force in x direction at E as discussed before. at joint D sum of forces along x direction should be zero. Since the DE is a zero force member, CD should also be a zero force member DF should also be a zero force member because at D both others are zero force members and there will be no member to offer reaction force. CF will have some force since it will have to compensate the vertical 10KN. and all other members will havesome force from there onwards. the values of force will depend on the lengths of the members. so the zero force members are CD, DE, DF, and FE.

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describe the three major categorical theories of language development,as listed below .consider the emphasis each places on innate abilities versus environment influences.also attribute key terms and theorist with one if the following categories. write a one page report on a language theorist or researcher who asserts a position that is different from your own preferred notion. .Behaviorist .Nativist .Interactionist Solution 1). Behaviourist: This is proposed by the behavioural theorists Skinner. As per his theory, children imitate what they see and hear and all behaviour is acquired by learning, so it can be unlearned by either the positive reinforcement or negative reinforcement. Skinner proposed that the speech of children is shaped by adults by reinforcing the babbling of infants. 2). Nativist: Nativist Noam Chomsky proposed a “LAD”, Language Acquisition Device, and believed that children are born with certain innate skills of language learning, which determines their speed of learning. They can learn the native language at a high speed and can improve their grammatical skills without much effort. The same inheritance factor is responsible for the skill of learning multiple languages in certain people. 3). Interactionist: Lev Vygotsky described the concept of “zone of proximal development,” which explains how the children learn better from the other children, i.e. collaborative learning. School environment play an important role in improving the intellectual skills of the children by means of classroom teachings and also learning from the other children. Interaction with the other school children also influences the development of communication skills in the society. Children learn from the other children in a better way than do from the adults..

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Compare the capabilities of the Microsoft Access, Microsoft SQL Server, Oracle’s MySQL, and Oracle relational database management systems (RDBMSs). Your paper should discuss the processing speeds, data storage capabilities, maximum users supported, platforms supported, user interfaces, development tools, vendor support, and cost. Discuss and cite at least two references in addition to our textbook. Your paper should be 3-5 pages in length (excluding title and References pages) Solution Microsoft Access Overview: Microsoft Access is a part of Microsoft Office, it is commercially available database in the market Inexpensive/standard on most computers users can create complex databases database professionalas can use construct a database customers of MS-Access: It is mainly used in small corporate companies or IT Sectors with 1-80 endusers. Features of MS-Access: 1.It is having GUI Interface for creating databases 2. A databae contains tables, forms, reports, queries, macros. 3. It facilitates autocontent wizards to build tables or forms or reports. 4. It acts as an interface to other DBMS using ODBC 5. It is used for small business companies 6. Provides security like password protection 7. Provides a Data dictionary 8. We can repair the database 9. We can create different views 10. External data can be imported into Access 11. We can create web pages based using the database 12. It has as built in Macro functions 13. It uses Structurered Query Language 14. We can create forms, reports etc by using Visual Basic Application programming 15. Provides Add in controls like calendars 16. It can merged into word and analysed with Excel etc. Issues: Security: User level security is very difficult Tuning: It does not have the ability to split over multiple Hard Drives, multiple CPUs or to place tables into memory. Locking: Basic handling of concurrent users Backup and recovery at basic level. ANSI SQL standard often doesn\'t work,MS-Access has it\'s own modified version of ANSI SQL. MySQL Overview MySQL is a database engine. It has a command line interface that allows the creation of database. It Requires Front-end applications to access it for end users. EX:- C#, PHP, Microsoft ASP.Net. Typical users Small companies or workgroups, through to very large Internet databases with large numbers of users Ex:wikipedia,Moodle. Features 1. Speed:One of the fastest databases available 2. Ease of use: when compared to larger databases such as Oracle Uses standard SQL 3. Capability: A multi-threaded server allowing many clients to connect at the same time Fully networked for the Internet with built in security 4.Portability: Runs on a many operating systems and different hardware 5. Small size: when compared to other large databases e.g. Oracle 6. Availabliity and Cost: Open Source ,Free in most situations to use 7. Open distribution and source code: You can check how it works – if you have the knowledge. 8. interface to other DBMS’s using Open Database Connectivit.

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are marine multicellular protists belonging to the larger brown algae. They are responsible for most of the food production through the photosynthesis in regions where they occur. The cell walls of fungi are made up of polysaccharides and In hornworts and liverworts which are non- vascular plants help anchor the minute plant. All plants exhibit of generations of diploid sporophytes with haploid gametophytes. 88. In plants the sporophyte generation does not produce as a result of melosis. Circulatory pathway between the lungs and the heart Most flatworms are meaning each individual containing both male and female sexual structures. solid worms that lack a body caity Members of the class octopuses, squids, and nautilus are the most intelligent of the invertebrates. Leeches along with other oligochaetes possess an organ called a which secretes a cocoon specialized to receive the eggs. The respiratory organ in the Arachinid, spider is called Breaking up of fat globules into smaller droplets by the action of bile salts in addition to containing two pairs antennae, also have legs on their abdomen and thorax, Echinoderms are symmetrical animals with a five-part body plan. Lymphatic vessels that aids the absorption of lipids Birds like mammals are meaning that they can regulate their body temperatures within close limits. All vertebrates have a heart and a(n) circulatory system of blood vessels. Solution Answer: 84). Stramenopiles A subgroup of chromalveolates, the stramenopiles, also referred to as heterokonts, includes photosynthetic marine algae and heterotrophic protists. The unifying feature of this group is the presence of a textured, or \"hairy,\" flagellum. 85). Chitin 86). Rhizoids Rhizoids are the colorless rootlike projections of mosses, liverworts, and hornworts that anchor them to the substrate. 87). Alternation The multicellular haploid plant structure is called the gametophyte, which is formed from the spore and give rise to the haploid gametes. The fluctuation between these diploid and haploid stages that occurs in plants is called the alternation of generations. 89). Pulmonary circulation Pulmonary circulation is the portion of the cardiovascular system which carries deoxygenated blood away from the heart, to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart. The term pulmonary circulation is readily paired and contrasted with the systemic circulation. 90). Hermaphrodites Many flatworms are \"hermaphroditic\". It means that each individual has both male and female \"gonads\", structures producing the \"gametes\" (sex cells, each with half the normal number of chromosomes) 91). Acelomates Acoelomate: an invertebrate lacking a coelom; especially : one belonging to the group comprising the flatworms and nemerteans and characterized by bilateral symmetry and a digestive cavity that is the only internal cavity..

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8-9 Which gene (C or D) is downstream in the pathway based on the epistatic class for feeding behavior? Gene C gene D Feeding Experiment: If methionine is added to the growth media of these mutant strains, all of them can grow. Some of them can intermediates in the synthesis of methionine are added. The intermediates include homocysteine, cysteine and cystathionine. In the table below the growth behavior (+ or -) of the methionine auxotrophs are shown when each strain is fed different compounds. Using this table, order the synthesis of intermediates from first to last in the synthesis of methionine Order of intermediates: ---- rightarrow _________ ---- rightarrow _________ ---- rightarrow _________ methionine Above each arrow indicate where each mutant (met A, B or Cor D) belongs. ---- rightarrow _________ ---- rightarrow _________ ---- rightarrow _________ methionine What intermediate builds up in the met A strain? _________ what intermediate builds up in the met C strain? __________ What intermediate builds up in the met D strain? Solution 1.The gene D is downstream in the process. 2.cysteine - cystathionine - homocysteine - methionine. 3.The first arrow represent strain B, the second arrow represent strain C, the third arrow represent strain D and fourth arrow represent strain A..

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4. Belief in God: Religion Studies researchers were interested in making in- ferences about the true proportion of Canadians who believe in some form of God. They randomly surveyed 100 Canadians and asked them whether or not they believed in God (‘Yes’ or ‘No’). 61 answered ‘Yes’. Below is the R output: 0.61 Solution a) 61 [ANSWER] b) Ho: u = 0.5 Ha: u=/= 0.5 [ANSWER] c) chi^2 = 4.84 [ANSWER] d) chi^2(df = 1) e) (0.514403, 0.705597) [ANSWER] f) As this one is one tailed, then we divide the two tailed probability by 2, P = 0.028/2 = 0.014 [ANSWER] As P < 0.05, Reject Ho. [ANSWER] g) There is significant evidence that majority of Canadians believe in some form of God with P value of 0.014..

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18. Identify (at least 5) and explain their meanings of reducing bleeding in concrete? 19. Identify and explain the early year of Portland cement. When was it first produced in the US? 20. Aggregates are usually divided into how many groups? 21. Name and describe three chemical admixtures in concrete? 22. What are the major reasons for using chemical admixtures in concrete mixtures? 23. Why is concrete so widely used? 24. How can we produce air-entraining concrete? 25. What are concrete components? 26. What are footings? Name two types and show how they relate to the building? 27. What are two types of Concrete Buildings Systems? 28. What are the six categories of concrete wall systems in current use? Solution 18) Bleeding in fresh concrete refers to the process where free water in the mix is pushed upward to the surface due to the settlement of heavier solid particles such as cement and water. Some bleeding is normal but excessive bleeding can be problematic. The way you work that bleed water can affect the durability of your products. The biggest factor in bleed water rates is the water-to-cement ratio. A higher ratio can lead to excessive bleeding. The cement type and fine aggregates can play a role in determining the bleed rate. The fewer fines you have in your mix, the more bleeding will occur. Factors also include concrete height and pressure. The relationship between bleed water and concrete heights starts off as linear, but eventually becomes nonlinear at increased heights. Ways to reduce bleeding in concrete include: 19) Portland cement is a basic cement mixture and a fundamental ingredient for many common cement applications. Because Portland cement is very common, it is also often called “Ordinary Portland Cement” or simply “OPC.” Since the early 20th century, Portland cement has been used internationally for a wide variety of applications including concrete projects, mortar pastes, stucco decorations, and grout fillings Roman cement was the predecessor to ordinary Portland cement. A crude form of Roman cement was rediscovered by English engineer John Smeaton in 1756. The formula for Roman cement was refined and patented in 1796 by James Parker. Around 1811, James Frost developed British cement: a new way of processing cement that became instrumental in making Portland cement. In 1824, the first form of Portland cement was patented by English cement manufacturer Joseph Aspdin. Aspdin’s version of Portland cement was further refined by his son, William, in 1843, and it closely resembled the ordinary Portland cement we know today. The United States imported Portland cement from Germany and England as early as 1868. Between the 1970s and 1980s, the United States began manufacturing their Portland cement in Michigan and Pennsylvania. Within a few years, most of the Portland cement used in the United States was produced locally. 20) For a good concrete mix, aggregates need to be clean, hard, strong particles free of absorbed chemicals o.

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With enough money, energy, and political will, the nations of the world could build and launch a space ship that will reach the nearest star, Alpha Centauri, and bring back news of life there: A. Before this decade is over. B. In about 50 years. C. With current technology the trip would take a hundred thousand years. D. With current technology we cannot get out of the Solar system, no matter how much time. This question is rather difficult. I think it would take over 50 years because it may have to go to each planet to look for life. Solution Its distance of 4.3 light-years equals 25.6 trillion miles away – nearly 300,000 times the distance from the Earth to the sun. It would take over 100,000 years using conventional technology. So the answer is C..

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Which THREE of the following statements about autotrophs and heterotrophs on Earth are TRUE? Question 10 options: The answer is NOT 2, 6, 7 or 3, 5, 4 Heterotrophs that do not eat autotrophs every day will die in a short time. Autotrophs depend on heterotrophs to oxidize sugar and release CO2 into the atmosphere. The majority of heterotrophs on Earth do not use aerobic respiration as a form of energy conversion. Heterotrophs evolved on Earth before autotrophs. The majority of autotrophs on Earth require aerobic respiration in order to survive. Heterotrophs are dependent on autotrophs to generate O2 from H2O in order to support aerobic respiration. Heterotrophs depend on autotrophs for conversion of light energy to chemical energy. There are no metabolic differences between autotrophs and heterotrophs. Heterotrophs that do not eat autotrophs every day will die in a short time. Autotrophs depend on heterotrophs to oxidize sugar and release CO2 into the atmosphere. The majority of heterotrophs on Earth do not use aerobic respiration as a form of energy conversion. Heterotrophs evolved on Earth before autotrophs. The majority of autotrophs on Earth require aerobic respiration in order to survive. Heterotrophs are dependent on autotrophs to generate O2 from H2O in order to support aerobic respiration. Heterotrophs depend on autotrophs for conversion of light energy to chemical energy. There are no metabolic differences between autotrophs and heterotrophs. Solution the correct statement would be : 4: because autotrophy is more complex than heterotrophy , the very first organisms were heterotrophs because they could feed on the molecules surrounding them. 6: Heterotrophs are dependent on autotrophs to generate O2 from H2O in order to support aerobic respiration. because if the autotrophs do not produce oxygen then heterotrophs can\'t live. infact the earth\'s atmosphere before autotrophs was without oxygen 7: Heterotrophs depend on autotrophs for conversion of light energy to chemical energy. similarly, heterotrophs never had the ability to convert sunlight into chemical energy. they only depended on autotrophs to produce food when the moleclar food was scarce..

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What type of biometric error signifies that an authorized user has been denied legitimate access? A. Type I B. Type II C. Type III D. Type IV Solution answer is a.type1 usually type 1 error raised when the autherized user with his credinals is rejected because of the system fault are high accurate device,in this senario the authorized user is denied to legitimate acces that meand user is declined to access the resources because of type 1 error.

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What is the best explanation for large smooth regions on Saturn\'s moon Enceladus? A. Enceladus is so small that it never gets hit by meteors. B. Water from sub-surface oceans can escape through geysers to refresh the surface. C. Orbital resonances with Titan and Mimas prevent meteors from hitting Enceladus. D. Saturn\'s magnetic field prevents meteors from hitting Enceladus. E. Saturn\'s rings protect the moon from impacts. Solution answer is E.

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The probability that a randomly selected adult owns an e-reader is 0.26. The probability that a randomly selected adult owns a tablet computer is 0.31. The probability that a randomly selected adult owns both kinds of devices is 0.17. The events E: a randomly selected adult owns an e-reader and T: a randomly selected adult owns a tablet computer areAIndependent because P(E) x P(T) = P(E and T)BIndependent because P(E) x P(T) P(E and T)CDependent because P(E) x P(T) = P(E and T)DDependent because P(E) x P(T) P(E and T)Eimpossible to tell if independent or not due to insufficient information Solution P(E) = P( e - reader) = 0.26 P(T) = P( tablet computer) = 0.31 P( E n T) = P(e -reader and tablet) = 0.17 P(E) x P(T) = 0.26*0.31 = 0.0806 [ANSWER] D. Dependent because P(E) x P(T) P(E and T).

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The following tables relates degree of interest in political elections to education and age: Test two hypotheses, H1: given educational level, age and degree of interest are unrelated, and H2: given age, educational level and degree of interest are unrelated.No high school educationDegree of InterestUnder 45Over 45Great71217Little305652 Solution Df = 3,4 p value = 0.1469 As p >0.05, accept null hypothesis that H0: given educational level, age and degree of interest are unrelated, and.

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1. Baking a potato takes a long time, even when cooking uses different forms of thermodynamics. Even in a hot oven, the inside of a potato warms up very slowly. a. What makes it hard for conduction to transfer heat to the center of the potato? b. What makes it hard for convection to transfer heat to the center of the potato? c. What makes it hard for radiation to transfer heat to the center of the potato? d. Why does inserting a metal skewer through the potato help it to cook quickly e. Why Can a Microwave do this job more efficiently and quicker? f. What is a potato clock and why does it work? 2. An electric hot water heater takes cold water at its inlet pipe and delivers hot water at its outlet pipe. Between these two pipes is a large water container. Many electric hot water heaters have two separate heating elements: one near the top of the water container and one near the bottom. Both heating elements project into the same hot water container inside the water heater. When the top element is heating water at the top of the container, why doesn’t convection occur and cause water at the bottom of the container to also become hot? Convection dictates where the water pipes attach to the container. Where hot water should be extracted from the container, and where should cold water be introduced into the container to replace that hot water? Why does the water heater’s bottom heating element operate more often and age more quickly than its top heating element? Why is it important to thermally insulate the hot water heater’s container? Energy flows into the hot water heater as electricity. Since energy is conserved and can’t accumulate forever inside the heater, it must leave somehow. At a time when the hot water is being used, how does most of the energy leave the hot water heater? How does “Instant Hot” water in a water cooler work differently? g. After a new water heater is installed in the basement, the bathroom sink in a 2 story home keeps banging and shooting out water. What might have cause this and what can be done to fix this yourself? 3. Friction in starting fires a. If you press a wooden peg against another piece of wood and spin the peg rapidly, it can become hot enough to ignite. The peg produces thermal energy no matter how fast it spins, so why is it important that it spin rapidly? b. If you strike a piece of flint against a piece of steel, you can shave a red-hot spark off the steel. However, moments later the surface of the steel itself barely feels warm. What happens to the thermal energy in that surface? c. When you rub a match on a matchbook, it suddenly bursts into flames. The principal source of heat here is a chemical reaction in the match head. What purpose does the initial thermal energy serve in starting this reaction? d. What is a safety match? How does it work? e. You might see a “cowboy match” in a movie light a match by rubbing it on the heel of their boot. How does a match light that way. 4. Glass transmits the visib.

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The amount of phospahtidylinositol-4,5-bisphosphate in the membrane is too small to fill the need for prolonged signaling. What is an alternative source of diacylglycerol? Question 29 options: A. Acetyl CoA B. Cardiolipin C. Intracellular IP2 D. Phosphatidyl choline and ethanolamine E. Triacylglycerols Solution D. Phosphatidyl choline and ethanolamine ..... there is a pthway called phosphatidylcholine pathway of diacyglycerol formation... memory based question no explination.

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