A refrigerator is used to maintain a freezing space at 1 degree celsiu.docx

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A refrigerator is used to maintain a freezing space at 1 degree celsius by absorbing heat from the freezing space when the environment temperature is 20 degrees celsius. The freezing space supplies heat at a rate of 1000 kJ/s and condenser removed heat at a rate of 500kJ/s to environment and refrigerator conumes 50kW of electric power when runnning. Is this refrigerator powerful enough to do this job? If no, what is the minimum power consumption for this job? Refrigerator operating on reversible cycle consumes minimum work (or power). please show work and steps. Thank you. Solution No the refrigerator is not powerful enough for the job Since the condenser removes heat at only half the rate the freezing air supplies heat The power of frig should be doubled so that condenser removes heat at twice the original rate = 1000 kj/s same as supplied by air Hence power of frig should be 2* 50kW = 100kw .

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A rigid, well-insulated gas cylinder contains N0 moles of an ideal gas at a temperature ToÂ Â and pressure Po. A venting valve is opened and the gas is pumped out of the tank. Derive an expression for the instantaneous temperature in the cylinder as a function of the number of moles of gas remaining in the cylinder. What is the final temperature Tf, if the tank is evacuated to Nf = 0? Is the prediction physically realistic? The heatÂ Â capacity at constant volume of the gas is independent of temperature. Solution PV = nRT nT = PV/R = constant nT = K Tdn + ndT = 0 Tdn = - ndT dT/dn = - T/n dT/T = -dn/n Integrating both sides ln T = - ln n + C at n=No ; T =To so ln To = - ln No + C C = ln To + ln No = ln To*No so ln T = ln To*No - ln n ln T = ln (To*No/n) T = (To*No)/n as n = Nf = 0 Twill tend to infinity...this is not practically possible .

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a societal right. None of the above. a group right. Both A and B. an individual right. Solution 1) quota , goal 2) By the end of 19th century , the supreme court was interpreting statutes and amendments in such a way that freedom for black americans were expanded 3) an individual right for owns a fire arm and may posses a gun on his person may consider his gun ownership in district of columbia. .

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A simple camera telephoto lens consists of two How far behind the concave lens should the film be placed? Express your answer using two significant figures concave lens with a focal length f210.1 cm The object to be photographed is 4.01 m in front of the objective lens. cm Submit Part B What is the linear magnification of this lens combination? Express your answer using two significant figures. Solution The image from the first (convex) lens is formed at a distance i1 from the object 1/o1 + 1/i1 = 1/f1 1/401 + 1/i1 = 1/39 i1 = 43.2 cm This image is formed 43.2 - 36.0 = 7.2 cm behind the second lens. That becomes the virtual image of the convex lens at i2 = -7.2 cm. The object for that image is 1/o2 + 1/i2 = -1/f2 1/o2 - 1/7.2 = -1/10.1 o2 = 25.1 cm o2 is actually the image of the lens system (interchange object and image in the concave lens formula). Image i1 has magnification 43.2/401 = 0.108, and the image i2 has magnification 25.1/7.2 = 3.5. Overall magnification is 0.108*3.5 = 0.378 .

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A priniciple purpose of a representation letter from management is to: Solution Management representation is a letter issued by an auditor\'s client to the auditor in writing as one of audit evidences. The date of the document must not be later than the date of audit work completion. It is used to let the client\'s management declare in writing that the financial statements and other presentations to the auditor are sufficient and appropriate and without omission of material facts to the financial statements, to the best of the management\'s knowledge. it is a form letter written by a company\'s external auditors, which is signed by senior company management. The letter states that all of the information submitted is accurate, and that all material information has been disclosed to the auditors. The auditors use this letter as part of their audit evidence. The letter also shifts some blame to management, if it turns out that some elements of the audited financial statements do not fairly represent the financial results, condition, or cash flows of the business. .

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Critical thinking question: what structural features (hint: there are four) do all ten of these opioid drugs have in common? Opioids Opioids are a powerful class of alkaloids that act on the central nervous narcotic analgesics. All opioids presumably bind to the same mu-opioid receptor sites in the brain and spinal cord. The most prevalent naturally occurring isolated from the opium poppy-is morphine (named after Morpheus, the sod of dreams). A methoxy derivative of morphine that is also isolated from opium poppy is codeine, which is both less addictive and less effective as a reliever than morphine. By contrast, the diacetyl derivative of morphine (heroin) isanalgesic not only a more powerful as a narcotic but also more addictive than morphine Many other synthetic derivatives of morphine are opioid agonists that are used as narcotic analgesics (including oxycodone, oxymorphone, hyd system as a plant-derived nitrogenout bases that have pronounced physiologial acevity on humans the arcotic a drug dhas numbs the ngonisa molecule that combines antagonist a molecule that inhibits senses and induces stupor a druE hat with a receptor to initiate and meperidine), while others (such as methadone and buprenorphine) are used to treat opioid addiction. Naloxone is an opioid antagonist that is used to counteract opioid overdose the physiological action of anocher CHyo 0 CH, Ho* CH CH (OxyContin) (Opana) Dlaudid) (Demerol Ph N-CH3 CHa (where Ph (Butrans, Suboxone) ritical Thinking Question Phat structural features (hint: there are four) do all ten of these opioid drugs have in commom? mene ving, Contein nivonen Solution Common features in all the given opiod structures are - 1. Presnece of a tertiary amine group. 2. Presence of a phenyl ring. 3. At least two rings are there in all the molecules. 4.All the opioids are polar compounds. .

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Contrast the argument that terrorist acts are easy to predict with the argument that they cannot be identified or predicted. Write it 4-5 paragraph with resources(References). Solution By using technology it was easy to predict the terrorist acts. This is because terrorists use social media sites for communication and now-a-days there are many pattern recognization and data mining algorithms are implemented to identify the words and to predict the next action of the terrorists reference:http://www.iflscience.com/technology/how-technology-help-predict-terrorist-attacks/ And even though advancement of technology cannot predict the terrorist act all the time, because if the terrorists are at one place then they don\'t use the internet or social media sites, so there will be no chance of prediction. But NSA, which have access to almost every device in the world can easily predict the action of every human being in the world and there are many other security agencies like NSA also can do this thing. Majorly, technology plays an important role in identifying or predicting the action of terrorists .

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Constants Part A By measurement you determine that sound waves are spreading out equally in all directions from a point source and that the intensity is 2.7x10-2 W/m2 at a distance of 4.5 Im from the source What is the intensity at a distance of 3.5 m from the source? Express your answer using two significant figures W/m2 Submit Incorrect. Try Again; 6 attempts remaining Part B How much sound energy does the source emit in one hour if its power output remains constant? Express your answer using two significant figures Submit Solution Part A. Intensity is given by: I = P/A = P/(4*pi*r^2) Since Source is same at both distance, So Power is constant, which means intensity is inversely proportional to square of distance from source. I2/I1 = (r1/r2)^2 I2 = I1*(r1/r2)^2 I2 = 2.7*10^-2*(4.5/3.5)^2 I2 = 4.5*10^-2 W/m^2 Part B. Power of source will be P = I*4*pi*r^2 P = 2.7*10^-2*4*pi*4.5^2 P = 6.87 W Now energy is given by: E = Power*time E = P*t t = 1 hr = 3600 sec E = 6.87*3600 E = 24732 J = 2.5*10^4 J Please Upvote. .

Constants Part A By measurement you determine that sound waves are spr.docx

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