resistance at 0o C α = 3.9083 x 10-3 /o C (2 marks) NDE Thermodynamics and Heat Transfer Exam 2008 Name: _______________________________________ Read all the instructions before starting Do not open this paper until instructed Time allowed: 2 hours (plus 5 minutes reading time) Attempt ALL question in Section A (questions 1 – 12) Attempt any TWO from Section B (questions 13-15) Answer the questions in the spaces provided on the question paper. Use the back of the previous page if required. If you
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1-1 Chapter 1 INTRODUCTION AND BASIC CONCEPTS Thermodynamics 1-1C Classical thermodynamics is based on experimental observations whereas statistical thermodynamics is based on the average behavior of large groups of particles. 1-2C On a downhill road the potential energy of the bicyclist is being converted to kinetic energy‚ and thus the bicyclist picks up speed. There is no creation of energy‚ and thus no violation of the conservation of energy principle. 1-3C There is no truth to his claim
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Identify Laws of Motion and Thermodynamics The first example is oscillating a pendulum‚ which is categorized in the law of motion due to the object remaining in that state unless an external force is applied. The second example stating cooling food and drinks in a refrigerator is categorized in the laws of Thermodynamics due to thermalization. The third example of using the coffeemaker can be a combination of both laws due to moving touching to coffeemaker to make create an action is Law of Motion
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Another industry related to the second law of thermodynamics is the air-conditioner. As the weather in this country‚ Malaysia is always hot and humid‚ air-conditioners are used to cool down the surrounding inside the house. In fact‚ the concept of air-conditioner is one of the applications of the second law of thermodynamics which stated that for any process occurring in a closed system‚ the entropy increases for an irreversible system and remains constant for a reversible system‚ but never decreases
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dksd dksmdfklda dksmdfmsd dfdsa sdfds sdfas d gfgdsf sd fsd d s d sd d gsdf gs d fgsd f g sd d g d g df d dfgf d g dff d sf s f sf d s f s f s f sdgfsdf sdf s d g sdf d d f f d sdddddddddd f gf d f ff f f s d gs df sdfgwsgsd gfsdfljkljgs sjgfskjflskjgsl sjflskjsjg skgsjjljdf s jskjljlsjlkjs sjfkjsdflgsenters the boiler at a pressure of 18 MPa‚ and saturated vapor enters the turbine. The condenser pressure is 6 kPa. Determine (a) the thermal efficiency. (b) the back work
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Corollary 1: The clausius statement of second law of thermodynamics is the first corollary i.e. ‘It is impossible to construct a device operating in a closed cycle that performs no effect other than the transfer of heat from a cooler body to a hotter body.’ The mathematical statement of which is given by; Q1‐Q2=W Q1 W Q2 Corollary 2: It is impossible to construct an engine operating between only two heat reservoirs‚ which will have a higher efficiency than a reversible heat engine operating between
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the French physicist Sadi Carnot‚ that heat and mechanical work are equivalent.[1] It is related to the mechanical equivalent of heat. Over the next century‚ with the introduction of the second law of thermodynamics in 1850 by Rudolf Clausius‚ this theory evolved into the science of thermodynamics. In 1851‚ in his "On the Dynamical Theory of Heat"‚ William
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California. Historically‚ “the first Borax specimens came from several dry lake deposits in Tibet” (The Mineral Borax). This experiment was conducted to determine the standard entropy and enthalpy of the dissolving reaction of borax in water. The thermodynamic properties of the reaction helped to determine the change in heat and spontaneity within the system. Entropy is said to be the tendency for the universe to move towards disorder. If the value of entropy is positive‚ then the amount of disorder
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Prompt #1: Does it matter that you can not really touch anything? How does this make you feel? If you could touch something‚ what would you touch? How do you think it would feel? I don’t think it matters that I can not really touch anything because I can feel it either way. Now that I’ve learned this it makes me question. I say this because we as humans have the sense of touch but we really don’t so I honestly makes me feel confused. If I could touch something I would touch a wall. I think it will
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5-1 Chapter 5 MASS AND ENERGY ANALYSIS OF CONTROL VOLUMES Conservation of Mass 5-1C Mass‚ energy‚ momentum‚ and electric charge are conserved‚ and volume and entropy are not conserved during a process. 5-2C Mass flow rate is the amount of mass flowing through a cross-section per unit time whereas the volume flow rate is the amount of volume flowing through a cross-section per unit time. 5-3C The amount of mass or energy entering a control volume does not have to be equal to the amount
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