http://cecs.boardeducation.net/feed/? Latest topics Thu, 11 Feb 2010 18:15:37 GMT 10 http://upload.traidnt.net/upfiles/N2N18571.jpg http://cecs.boardeducation.net/feed/? http://cecs.boardeducation.net/desalination-technology-forum-f18/multi-desalination-process-t73.htm Eng.Saeed Almalowi ]]> DESALINATION TECHNOLOGY FORUM Thu, 11 Feb 2010 18:15:37 GMT http://cecs.boardeducation.net/desalination-technology-forum-f18/multi-desalination-process-t73.htm#89 http://cecs.boardeducation.net/desalination-technology-forum-f18/multi-desalination-process-t73.htm http://cecs.boardeducation.net/heat-transfer-forum-f22/lecture-in-fundamental-of-heat-transfer-t72.htm Eng.Saeed Almalowi
http://www.youtube.com/watch?v=pXQjDvEg8Bw

Thanks]]> HEAT TRANSFER FORUM Wed, 03 Feb 2010 18:29:58 GMT http://cecs.boardeducation.net/heat-transfer-forum-f22/lecture-in-fundamental-of-heat-transfer-t72.htm#88 http://cecs.boardeducation.net/heat-transfer-forum-f22/lecture-in-fundamental-of-heat-transfer-t72.htm http://cecs.boardeducation.net/machine-dynamics-forum-f10/module-1-lecture-2-rigid-body-motion-t71.htm Wiliam
ThisModule 1 - Lecture 2 - Rigid Body Motion

a lecture on You tube about Rigid Body Motion

http://www.youtube.com/watch?v=KicllB3Upyc&feature=PlayList&p=46AAEDA6ABAFCA78&index=1

Thanks all,

William]]> MACHINE DYNAMICS FORUM Tue, 02 Feb 2010 17:40:15 GMT http://cecs.boardeducation.net/machine-dynamics-forum-f10/module-1-lecture-2-rigid-body-motion-t71.htm#87 http://cecs.boardeducation.net/machine-dynamics-forum-f10/module-1-lecture-2-rigid-body-motion-t71.htm http://cecs.boardeducation.net/statics-forum-f11/md-solid-soution-and-paper-and-pen-solution-for-statics-problems-comparing-t70.htm Eng.Saeed Almalowi

MD Solid Solution or Computer Solution:




]]> STATICS FORUM Sat, 23 Jan 2010 08:07:52 GMT http://cecs.boardeducation.net/statics-forum-f11/md-solid-soution-and-paper-and-pen-solution-for-statics-problems-comparing-t70.htm#85 http://cecs.boardeducation.net/statics-forum-f11/md-solid-soution-and-paper-and-pen-solution-for-statics-problems-comparing-t70.htm http://cecs.boardeducation.net/statics-forum-f11/statics-problems-t51.htm Eng.Saeed Almalowi Problem 1: The window is held open by chain AB. Determine the length of the chain, and express the 50-lb force acting at A along the chain as a Cartesian vector. Determine its coordinate direction angles. Problem 2: The cords BCA and CD can each support a maximum load of 100-lb. Determine the maximum weight of the crate that can be hoisted at constant velocity, and the angle q for equilibrium. Problem 3: The 2500-N crate is to be hoisted with constant velocity from the hold of ... STATICS FORUM Sat, 02 Jan 2010 07:04:39 GMT http://cecs.boardeducation.net/statics-forum-f11/statics-problems-t51.htm#57 http://cecs.boardeducation.net/statics-forum-f11/statics-problems-t51.htm http://cecs.boardeducation.net/dynamics-forum-f12/dynamics-problems-with-soultions-t66.htm Eng.Saeed Almalowi
]]> DYNAMICS FORUM Sat, 09 Jan 2010 07:14:18 GMT http://cecs.boardeducation.net/dynamics-forum-f12/dynamics-problems-with-soultions-t66.htm#77 http://cecs.boardeducation.net/dynamics-forum-f12/dynamics-problems-with-soultions-t66.htm http://cecs.boardeducation.net/fluid-mechanics-forum-f6/viscosity-equation-t69.htm Eng.Saeed Almalowi ]]> FLUID MECHANICS FORUM Mon, 18 Jan 2010 04:47:39 GMT http://cecs.boardeducation.net/fluid-mechanics-forum-f6/viscosity-equation-t69.htm#80 http://cecs.boardeducation.net/fluid-mechanics-forum-f6/viscosity-equation-t69.htm http://cecs.boardeducation.net/fluid-mechanics-forum-f6/experiment-of-viscometer-cylinder-t68.htm Eng.Saeed Almalowi I have designed simple program to help us to measure viscosity of fluids by the easiest way. Viscometer Cylinder Download a program http://upload.traidnt.net/dldvci89480.zip.html FLUID MECHANICS FORUM Mon, 18 Jan 2010 04:36:09 GMT http://cecs.boardeducation.net/fluid-mechanics-forum-f6/experiment-of-viscometer-cylinder-t68.htm#79 http://cecs.boardeducation.net/fluid-mechanics-forum-f6/experiment-of-viscometer-cylinder-t68.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-power-point-explnations-solved-problems-t67.htm Eng.Saeed Almalowi Hope that you find usefuel information. If you face a problem when you try to down load this file, please let me know.
[url=]PRESS HERE TO DOWNLOAD [/url]]]> THERMODYNAMICS FORUM Mon, 11 Jan 2010 07:10:27 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-power-point-explnations-solved-problems-t67.htm#78 http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-power-point-explnations-solved-problems-t67.htm http://cecs.boardeducation.net/dynamics-forum-f12/try-to-solve-these-problems-t24.htm Admin Hanging Pushed Pumpkin Problem A pumpkin of unknown mass is suspended by a cord attached to the celing and pushed away from vertical. When a 24.0 N force is applied to the pumpkin at an angle of 18.00 to horizontal, the pumpkin will remain in equilibrium when the cord makes an angle of 32.00 with the vertical (A) What is the tension in the cord when the pumpkin is in equilibrium ? (B) What is the mass of the pumpkin ? -------------------------------------------------------------------------------- PROBLEM ... DYNAMICS FORUM Wed, 28 Oct 2009 21:39:53 GMT http://cecs.boardeducation.net/dynamics-forum-f12/try-to-solve-these-problems-t24.htm#25 http://cecs.boardeducation.net/dynamics-forum-f12/try-to-solve-these-problems-t24.htm http://cecs.boardeducation.net/desalination-technology-forum-f18/reverse-osmsis-faq-t65.htm Eng.Saeed Almalowi What is reverse osmosis? Reverse osmosis, often referred to as RO, is an advanced water purification method that was initially developed by the U.S. Navy to produce drinking water from sea water for submarine crews. It is a membrane filtration technology that works by forcing water under pressure through the very tiny pores of a semi-permeable membrane. Modern reverse osmosis units for the home combine membrane technology with carbon and mechanical filtration to produce highly purified, great-tasting ... DESALINATION TECHNOLOGY FORUM Sat, 09 Jan 2010 05:38:29 GMT http://cecs.boardeducation.net/desalination-technology-forum-f18/reverse-osmsis-faq-t65.htm#75 http://cecs.boardeducation.net/desalination-technology-forum-f18/reverse-osmsis-faq-t65.htm http://cecs.boardeducation.net/mathematics-forum-f34/integeration-formulas-t64.htm Eng.Saeed Almalowi

]]> MATHEMATICS FORUM Sat, 09 Jan 2010 05:31:49 GMT http://cecs.boardeducation.net/mathematics-forum-f34/integeration-formulas-t64.htm#74 http://cecs.boardeducation.net/mathematics-forum-f34/integeration-formulas-t64.htm http://cecs.boardeducation.net/engineering-equation-solver-forum-f30/explanations-about-ees-program-t63.htm Eng.Saeed Almalowi
http://upload.traidnt.net/dld7sT06088.zip.html

REGARDS]]> ENGINEERING EQUATION SOLVER FORUM Sat, 09 Jan 2010 03:02:53 GMT http://cecs.boardeducation.net/engineering-equation-solver-forum-f30/explanations-about-ees-program-t63.htm#73 http://cecs.boardeducation.net/engineering-equation-solver-forum-f30/explanations-about-ees-program-t63.htm http://cecs.boardeducation.net/engineering-managment-forum-f23/industrial-project-management-book-t62.htm John Industrial Project Management: Concepts, Tools, and Techniques (Industrial Innovation) By Adedeji B. Badiru,&nbspAbidemi Badiru,&nbspAdetokunboh Badiru, * Publisher: CRC * Number Of Pages: 320 * Publication Date: 2007-08-13 * ISBN / ASIN: 0849387736 $99.95 Book Description: Whatever your business, getting the work done on time can make or break your organization. The faster the world moves, the more this becomes important. The expanding utility and relevance of project ... ENGINEERING MANAGMENT FORUM Wed, 06 Jan 2010 14:34:56 GMT http://cecs.boardeducation.net/engineering-managment-forum-f23/industrial-project-management-book-t62.htm#72 http://cecs.boardeducation.net/engineering-managment-forum-f23/industrial-project-management-book-t62.htm http://cecs.boardeducation.net/physics-forum-f35/newton-second-law-forces-act-on-horizontal-plane-and-incline-plane-t61.htm Eng.Saeed Almalowi Solution


Example2: Now place the 20kg mass (with no external force applied) on a frictionless 50° incline plane. What is the
acceleration of the mass?

]]> PHYSICS FORUM Wed, 06 Jan 2010 14:23:19 GMT http://cecs.boardeducation.net/physics-forum-f35/newton-second-law-forces-act-on-horizontal-plane-and-incline-plane-t61.htm#71 http://cecs.boardeducation.net/physics-forum-f35/newton-second-law-forces-act-on-horizontal-plane-and-incline-plane-t61.htm http://cecs.boardeducation.net/physics-forum-f35/physics-problem-challenges-understanding-t60.htm Frank Sliding. A block of wood is given a push and slides along a horizontal, flat table surface, coming to a stop. Of course it's obvious that friction is the reason that its kinetic energy drops to zero when it stops, work having been done as a result of the force due to friction at the interface between the table and the bottom of the block. (1) But what about the block's momentum? What happened to that? (2) And what about the block's angular momentum? It doesn't have any, you say. Well, ... PHYSICS FORUM Wed, 06 Jan 2010 06:00:38 GMT http://cecs.boardeducation.net/physics-forum-f35/physics-problem-challenges-understanding-t60.htm#68 http://cecs.boardeducation.net/physics-forum-f35/physics-problem-challenges-understanding-t60.htm http://cecs.boardeducation.net/statics-forum-f11/truss-by-md-solid-t59.htm John
I would lik somebody solve any truss problem by using MD Solid and give us details how we can use this program to solve an type of Truss?

Thanks]]> STATICS FORUM Wed, 06 Jan 2010 04:43:54 GMT http://cecs.boardeducation.net/statics-forum-f11/truss-by-md-solid-t59.htm#66 http://cecs.boardeducation.net/statics-forum-f11/truss-by-md-solid-t59.htm http://cecs.boardeducation.net/english-forum-f36/english-grammar-in-use-t58.htm Eng.Saeed Almalowi I have attached the power point in PDF form about English Languge Grammar. I hope to find useful information.
Down load attached file

http://upload.traidnt.net/dldSAY52128.zip.html]]> ENGLISH FORUM Wed, 06 Jan 2010 04:36:10 GMT http://cecs.boardeducation.net/english-forum-f36/english-grammar-in-use-t58.htm#65 http://cecs.boardeducation.net/english-forum-f36/english-grammar-in-use-t58.htm http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-ecnomic-descisions-t57.htm Eng.Saeed Almalowi ]]> ENGINEERING ECONOMY FORUM Sun, 03 Jan 2010 07:00:33 GMT http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-ecnomic-descisions-t57.htm#64 http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-ecnomic-descisions-t57.htm http://cecs.boardeducation.net/engineering-economy-forum-f24/amortization-table-t56.htm Eng.Saeed Almalowi DEFINITION: An amortization table is used to track monthly payments when repaying a loan. EXAMPLE: If you take out a loan for $70,000 to be paid back in 30 years at a fixed yearly interest rate of 10.5%, what will be the amount of the monthly payment? Also, create an amortization table for the first 12 months. (Taken from a table in the previous Des Moines Register article.) Table: Payment Monthly Amount Amount Current Number Payment Interest Principal Balance ... ENGINEERING ECONOMY FORUM Sun, 03 Jan 2010 06:26:59 GMT http://cecs.boardeducation.net/engineering-economy-forum-f24/amortization-table-t56.htm#63 http://cecs.boardeducation.net/engineering-economy-forum-f24/amortization-table-t56.htm http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-economy-t54.htm Admin Engineering Economy The following variables will be used throughout the presentation P = Principal (Present Sum) S = Future Sum N = Number of Payments I = Interest Rate Simple Interest Equation: S = P + N I P = P (1 + N I) Example: If $100.00 was deposited at 6% yearly interest, your account would have these balances after each year. Year Balance 0 100.00 1 106.00 ... ENGINEERING ECONOMY FORUM Sat, 02 Jan 2010 09:05:39 GMT http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-economy-t54.htm#60 http://cecs.boardeducation.net/engineering-economy-forum-f24/engineering-economy-t54.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/problem-in-thermodynamics-cycle-t55.htm Admin



]]> THERMODYNAMICS FORUM Sat, 02 Jan 2010 22:41:19 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/problem-in-thermodynamics-cycle-t55.htm#61 http://cecs.boardeducation.net/thermodynamics-forum-f1/problem-in-thermodynamics-cycle-t55.htm http://cecs.boardeducation.net/md-solid-program-forum-f28/installation-of-md-solid-program-t53.htm Admin To install MD solid, press on one of these links: MDSolids requires Windows 95/98/2000/ME/XP/Vista or Windows NT 4 and at least SVGA resolution (800 x 600). This download is a complete and fully-functional version of MDSolids. It may be used free-of-charge for a 30-day evaluation period. Please save the .zip file on your machine. Download MDSolids 3.5.0 http://www.mdsolids.com/download/mds30/MDSolids30.zip 12/26/2008, 10 MB Download MDSolids 3.5.0 http://www.mdsolids.com/download/mds30/MDSolids30msi.zip ... MD SOLID PROGRAM FORUM Sat, 02 Jan 2010 08:45:17 GMT http://cecs.boardeducation.net/md-solid-program-forum-f28/installation-of-md-solid-program-t53.htm#59 http://cecs.boardeducation.net/md-solid-program-forum-f28/installation-of-md-solid-program-t53.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-cycle-by-using-ees-t52.htm Admin ]]> THERMODYNAMICS FORUM Sat, 02 Jan 2010 08:05:34 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-cycle-by-using-ees-t52.htm#58 http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-cycle-by-using-ees-t52.htm http://cecs.boardeducation.net/statics-forum-f11/coordinates-and-addition-of-vectors-t50.htm Eng.Saeed Almalowi Unit vector: A vector of unit length Components of a vector in orthogonal bases: Unit vectors i and j are along the x and y directions Addition of vectors using the components STATICS FORUM Sat, 02 Jan 2010 06:55:44 GMT http://cecs.boardeducation.net/statics-forum-f11/coordinates-and-addition-of-vectors-t50.htm#56 http://cecs.boardeducation.net/statics-forum-f11/coordinates-and-addition-of-vectors-t50.htm http://cecs.boardeducation.net/mechanical-viberation-forum-f9/units-dimensions-conversion-factors-t49.htm Admin UNITS, DIMENSIONS & CONVERSION FACTORS Unit All meaningful measurements in engineering science consist of at least two parts - a magnitude and a unit. Thus the measurement 3 metres consists of the magnitude or number, 3, and the unit, in this case the metre. Entity A unit is measure of a certain physical 'entity', for example the centimetre unit is a measure of the entity length, the kilometre/hour a unit of the entity speed, and so on. Entity Inter-Relationship - Dimensions ... MECHANICAL VIBERATION FORUM Sat, 02 Jan 2010 06:47:44 GMT http://cecs.boardeducation.net/mechanical-viberation-forum-f9/units-dimensions-conversion-factors-t49.htm#55 http://cecs.boardeducation.net/mechanical-viberation-forum-f9/units-dimensions-conversion-factors-t49.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm Admin We have seen that failure of a tensile member occurs when the stress caused by the actual load reaches the stress limit - the strength - of the member's material. Correlation of the actual stress with the maximum stress (strength) is straightforward in this case because they are both uniaxial. But how can we correlate the triaxial stress state in a component - whose material strength(s) is measured in uniaxial tests - to assess failure tendency? Unfortunately there is at present no fundamental ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:42:37 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm#54 http://cecs.boardeducation.net/machine-element-design-forum-f8/failure-theories-t48.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm Admin We refer to tension, shear, bending and torsion as elementary load building blocks because the loading which is applied to most components is a combination (superposition) of these four - for example, a rotating shaft which transmits power is subjected not only to torsion, but usually also to bending and to direct shear. The similarities and differences between the load building blocks are illustrated here. This first example applies the building blocks to the analysis of a bent cantilever. ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:37:21 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm#53 http://cecs.boardeducation.net/machine-element-design-forum-f8/loading-building-blocks-t47.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm Admin We shall use a tightened nut and bolt, in which the detailed stress variation is extremely complicated, to illustrate some of the simplifying assumptions which are usually made in routine analysis and design. The leftmost sketch below shows an assembly comprising a nut and bolt which fasten two components together. The nut and bolt pair can be regarded as a sub-assembly or component in its own right. Before any identification of the stresses can be attempted, all external effects on this ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:33:35 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm#52 http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-concentration-t46.htm http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm Admin You are walking in the countryside when you come across a creek which is too wide to jump. Problem: How can you cross to the far side without a soaking? Applying creativity, you may come up with the following possible solutions, depending upon the circumstances :- roll up your jeans and wade across dam the creek adapt a couple of tent-poles as stilts to walk dry-shod through the creek bend a sapling, secure it with a rope, climb the sapling, cut the rope and catapult across construct ... MACHINE ELEMENT DESIGN FORUM Sat, 02 Jan 2010 06:25:38 GMT http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm#51 http://cecs.boardeducation.net/machine-element-design-forum-f8/stress-strength-and-safety-t45.htm http://cecs.boardeducation.net/statistics-probability-forum-f26/questions-from-gre-exam-i-need-help-t44.htm Eng.Saeed Almalowi Dr. Colin, I took GRE exam last week, and it had a lot of problems from Statistics& Probability. I want you to solve these problems because I saw them in last GRE exam. I solved all of them and I have remembered the answer of each, but I am not sure if my solutions were correct or not: 1st question: My answer was 16 2nd question: My answers were a- 1-0.2 2-0.10 b- 0.53 Please tell me if my solution was correct otherwise I appreciate you if you give me a correct answer. Q1: ... STATISTICS & PROBABILITY FORUM Fri, 06 Nov 2009 13:34:35 GMT http://cecs.boardeducation.net/statistics-probability-forum-f26/questions-from-gre-exam-i-need-help-t44.htm#47 http://cecs.boardeducation.net/statistics-probability-forum-f26/questions-from-gre-exam-i-need-help-t44.htm http://cecs.boardeducation.net/statistics-probability-forum-f26/probability-t43.htm Eng. Colin the line A has 97% quality of products and line B has 98% quality of products.
Today, we pick 3 products in each line.
What is the probability of 6 products have 3 bad products?]]> STATISTICS & PROBABILITY FORUM Fri, 06 Nov 2009 03:13:36 GMT http://cecs.boardeducation.net/statistics-probability-forum-f26/probability-t43.htm#46 http://cecs.boardeducation.net/statistics-probability-forum-f26/probability-t43.htm http://cecs.boardeducation.net/statistics-probability-forum-f26/set-independent-events-t42.htm Eng. Colin Set: A set is a collection of distinct objects, considered as an object in its own right.

http://en.wikipedia.org/wiki/Set_(mathematics)

Let A、B and C be independent events. Given P(A U B U C)=0.88、P(B)=0.5 and P(C)=0.6, find P(A).]]> STATISTICS & PROBABILITY FORUM Fri, 06 Nov 2009 02:59:47 GMT http://cecs.boardeducation.net/statistics-probability-forum-f26/set-independent-events-t42.htm#45 http://cecs.boardeducation.net/statistics-probability-forum-f26/set-independent-events-t42.htm http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/equivalent-resistance-for-parallel-circuits-t41.htm Eng.Saeed Almalowi Find the equivalent resistance for the circuit shown above. Note that the 4 and 5 are NOT in parallel because the 2 and 8 are in between. The 1 and 2 are NOT in series because the 4 is in between. The 1 and 7 are NOT in parallel because the 4 is in between. The only combination you can make (at first) is the 3, 6, and 9 are in series, so: Now the 5 and 18 are in parallel: The 2, 3.9, and 8 are in series: The 4 and 13.9 are in parallel: Finally, all three are in series Req ... FUNDAMENTAL OF ELECTRICAL CIRCUITS FORUM Wed, 04 Nov 2009 16:15:11 GMT http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/equivalent-resistance-for-parallel-circuits-t41.htm#44 http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/equivalent-resistance-for-parallel-circuits-t41.htm http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/electrical-circuit-problem-t40.htm Eng.Saeed Almalowi Find the current through the 5 volt source by simplifying the resistors to a single equivalent resistance. The 10 and 20 are in parallel (because the tops and the bottoms are connected so that they share the same voltage) and the 30 and 40 are in parallel. Now the two resistors are in series, so: We can compute the current using Ohm's law, I = V/R = 5 V / 23.81ohms = 210 mA FUNDAMENTAL OF ELECTRICAL CIRCUITS FORUM Wed, 04 Nov 2009 15:23:19 GMT http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/electrical-circuit-problem-t40.htm#43 http://cecs.boardeducation.net/fundamental-of-electrical-circuits-forum-f31/electrical-circuit-problem-t40.htm http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-head-of-flow-t39.htm Admin Head of Flow Equation (3) is often referred to the head because all elements has the unit of length. Dynamic Pressure (2) and (3) are two forms of the Bernoulli Equation for steady state incompressible flow. If we assume that the gravitational body force is negligible, (3) can be written as (4). Both elements in the equation have the unit of pressure and it's common to refer the flow velocity component as the dynamic pressure of the fluid flow (5). Since energy is conserved along ... FLUID MECHANICS FORUM Wed, 04 Nov 2009 13:52:22 GMT http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-head-of-flow-t39.htm#42 http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-head-of-flow-t39.htm http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-conservation-of-energy-non-viscous-incompressible-fluid-in-steady-flow-t38.htm Admin ]]> FLUID MECHANICS FORUM Wed, 04 Nov 2009 13:48:45 GMT http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-conservation-of-energy-non-viscous-incompressible-fluid-in-steady-flow-t38.htm#41 http://cecs.boardeducation.net/fluid-mechanics-forum-f6/bernoulli-equation-conservation-of-energy-non-viscous-incompressible-fluid-in-steady-flow-t38.htm http://cecs.boardeducation.net/mechanical-viberation-forum-f9/mechanical-viberartion-concepts-t26.htm Eng.Saeed Almalowi The continuing motion, repetitive and often periodic, of a solid or liquid body within certain spatial limits. Vibration occurs frequently in a variety of natural phenomena such as the tidal motion of the oceans, in rotating and stationary machinery, in structures as varied in nature as buildings and ships, in vehicles, and in combinations of these various elements in larger systems. The sources of vibration and the types of vibratory motion and their propagation are subjects that are complicated ... MECHANICAL VIBERATION FORUM Thu, 29 Oct 2009 12:32:03 GMT http://cecs.boardeducation.net/mechanical-viberation-forum-f9/mechanical-viberartion-concepts-t26.htm#27 http://cecs.boardeducation.net/mechanical-viberation-forum-f9/mechanical-viberartion-concepts-t26.htm http://cecs.boardeducation.net/statistics-probability-forum-f26/best-estimate-of-the-average-t37.htm Eng. Colin The average tread life was found to be 50,000 miles with a standard deviation of 3,500 miles.
What is the best estimate of the average tread life in miles for the entire population of these tires?]]> STATISTICS & PROBABILITY FORUM Tue, 03 Nov 2009 02:44:26 GMT http://cecs.boardeducation.net/statistics-probability-forum-f26/best-estimate-of-the-average-t37.htm#39 http://cecs.boardeducation.net/statistics-probability-forum-f26/best-estimate-of-the-average-t37.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/steam-cycle-problem-t36.htm Admin Consider a reheat-regenerative vapor power cycle with two feedwater heaters, a closed feedwater heater and an open feedwater heater. Steam enters the first turbine at 10 MPa, 500oC and expands to 0.8 MPa. The steam is reheated to 440oC before entering the second turbine, where it expands to the condenser pressure of 0.007 MPa. Steam is extracted from the first turbine at 2 MPa and fed to the closed feedwater heater. Feedwater leaves the closed heater at 205oC and 10 MPa, and condensate exits ... THERMODYNAMICS FORUM Mon, 02 Nov 2009 17:22:15 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/steam-cycle-problem-t36.htm#38 http://cecs.boardeducation.net/thermodynamics-forum-f1/steam-cycle-problem-t36.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/power-steam-problem-t35.htm Admin Consider a steam power plant operating on the reheat Rankine cycle. Steam enters the high pressure turbine at 16 MPa and 550oC, is condensed in the condenser at 10 kPa. If the moisture content of the steam at the exit of the low pressure turbine is not to exceed 5%, determine (a) the pressure at which the steam should be reheated, and (b) the thermal efficiency of the cycle. Assume the steam is reheated to the inlet temperature of the high pressure turbine.(c) What-if-scenario: How would the ... THERMODYNAMICS FORUM Mon, 02 Nov 2009 15:16:04 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/power-steam-problem-t35.htm#37 http://cecs.boardeducation.net/thermodynamics-forum-f1/power-steam-problem-t35.htm http://cecs.boardeducation.net/heat-transfer-forum-f22/heat-transfer-problems-basic-t34.htm Admin Heat Transfer Calculations In lesson 1-6, you were introduced to the concept of heat. That lesson described the energy of chemical reactions, and explained the difference between endothermic and exothermic reactions. Chemists measure the heat given off or taken in during a chemical reaction to determine the energy of a specific chemical or physical reaction. In this lesson, you will learn to calculate the amount of heat transferred during a physical ... HEAT TRANSFER FORUM Sat, 31 Oct 2009 01:55:52 GMT http://cecs.boardeducation.net/heat-transfer-forum-f22/heat-transfer-problems-basic-t34.htm#36 http://cecs.boardeducation.net/heat-transfer-forum-f22/heat-transfer-problems-basic-t34.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/mass-equation-recapitulation-problems-t33.htm Admin -------------------------------------------------------------------------------- Section-1: Mass Equation (Recapitulation) -------------------------------------------------------------------------------- 2-1-1 [m] Mass enters an open system with one inlet and one exit at a constant rate of 50 kg/min. At the exit, the mass flow rate is 60 kg/min. If the system initially contains 1000 kg of working fluid, determine the time when the system mass becomes 500 kg. [Manual Solution] Answers: ... THERMODYNAMICS FORUM Sat, 31 Oct 2009 01:37:09 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/mass-equation-recapitulation-problems-t33.htm#35 http://cecs.boardeducation.net/thermodynamics-forum-f1/mass-equation-recapitulation-problems-t33.htm http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-problems-t32.htm Admin Section-1: Mechanical and Thermodynamic Systems -------------------------------------------------------------------------------- -------------------------------------------------------------------------------- • Free Body Diagram -------------------------------------------------------------------------------- 1-1-1 Two thermo books, each with a mass of 1 kg, are stacked one on top of another. Neglecting the presence of atmosphere, draw the free body diagram of the book at the ... THERMODYNAMICS FORUM Sat, 31 Oct 2009 01:34:32 GMT http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-problems-t32.htm#34 http://cecs.boardeducation.net/thermodynamics-forum-f1/thermodynamics-problems-t32.htm http://cecs.boardeducation.net/matlab-program-forum-f27/loops-and-control-t31.htm Eng.Saeed Almalowi Sometimes, you do need to use some kind of loop to do what you need, rather than just operating on an entire matrix or vector at once. While Loops The syntax for a while loop is while (some logical expression) do something; do something else; end To keep this from going on forever, you should probably be changing some variable in the logical expression within the body of the loop so that it eventually is not true. For The syntax for a for loop is: ... MATLAB PROGRAM FORUM Thu, 29 Oct 2009 12:53:26 GMT http://cecs.boardeducation.net/matlab-program-forum-f27/loops-and-control-t31.htm#33 http://cecs.boardeducation.net/matlab-program-forum-f27/loops-and-control-t31.htm http://cecs.boardeducation.net/matlab-program-forum-f27/writing-functions-and-scripts-t30.htm Eng.Saeed Almalowi All matlab functions and scripts are plain text files that contain matlab commands. Matlab will treat any file that ends in .m as either a function or a script. It can find .m files you've written that are in your ~/matlab directory, in the directory you have cd'd into from the matlab prompt, or in a directory you've started matlab with (ie, matlab /mit/2.670/Computers/Matlab/Examples starts up matlab and adds that directory to the places matlab will look for .m files in.) Scripts A ... MATLAB PROGRAM FORUM Thu, 29 Oct 2009 12:52:41 GMT http://cecs.boardeducation.net/matlab-program-forum-f27/writing-functions-and-scripts-t30.htm#32 http://cecs.boardeducation.net/matlab-program-forum-f27/writing-functions-and-scripts-t30.htm http://cecs.boardeducation.net/matlab-program-forum-f27/polynomials-and-fitting-t29.htm Eng.Saeed Almalowi Matlab can treat a vector as a polynomial. It will assume that the numbers represent the coefficients of the polynomial going from highest-order to lowest order. >>p = [1 2 2 4 1] can represent the polynomial x^4 + 2x^3 + 2x^2 + 4x + 1. There are a number of functions that use this representation of polynomials: >>roots(p) gives you the roots of the polynomail represented by the vector p. >>polyval(p,4) gives you the value of the polynomial p when ... MATLAB PROGRAM FORUM Thu, 29 Oct 2009 12:51:06 GMT http://cecs.boardeducation.net/matlab-program-forum-f27/polynomials-and-fitting-t29.htm#31 http://cecs.boardeducation.net/matlab-program-forum-f27/polynomials-and-fitting-t29.htm http://cecs.boardeducation.net/matlab-program-forum-f27/dealing-with-matrices-t28.htm Eng.Saeed Almalowi Once you have a matrix, you can refer to specific elements in it. Matlab indexes matrices by row and column. c(3,1) is the element in the third row, 1st column, which is 4. c(2:3,1:2) gives you the elements in rows 2-3, and columns 1-2, so you get 2 7 4 3 as a result. c(1:3,2) gives you the elements in rows 1-3, and the second column, that is, the entire second column. You can shortcut this to: c(:,2) literally telling matlab to use all the rows in the second column, ie, ... MATLAB PROGRAM FORUM Thu, 29 Oct 2009 12:48:07 GMT http://cecs.boardeducation.net/matlab-program-forum-f27/dealing-with-matrices-t28.htm#30 http://cecs.boardeducation.net/matlab-program-forum-f27/dealing-with-matrices-t28.htm http://cecs.boardeducation.net/matlab-program-forum-f27/start-from-the-basic-t27.htm Eng.Saeed Almalowi Calculator functions work as you'd expect: >>(1+4)*3 ans = 15 + and - are addition, / is division, * is multiplication, ^ is an exponent. You can assign variables from the matlab workspace. Everything in matlab is a matrix. (If it's a scalar, it's actually a 1x1 matrix, and if it's a vector, it's an Nx1 or 1xN matrix.) >>a = 3 a = 3 To create a vector is pretty similar. Each element is separated by spaces, the whole vectore is in ... MATLAB PROGRAM FORUM Thu, 29 Oct 2009 12:46:49 GMT http://cecs.boardeducation.net/matlab-program-forum-f27/start-from-the-basic-t27.htm#29 http://cecs.boardeducation.net/matlab-program-forum-f27/start-from-the-basic-t27.htm http://cecs.boardeducation.net/fluid-mechanics-forum-f6/fluid-problem-about-submerged-block-t25.htm Admin Submerged Block Problem A 15.0 kg cube of wood with a density of 750 kg/m3 is submerged in a large container of water. The cube of wood is prevented from floating to the surface by a cord attached to the bottom of the container. (A) How much buoyant force does the water exert on the cube ? Does the buoyant force depend upon the depth of the water ? (B) What is the tension in the cord holding the cube submerged ? Will the tension change if gasoline (680 kg/m3) were added on top of ... FLUID MECHANICS FORUM Wed, 28 Oct 2009 22:00:31 GMT http://cecs.boardeducation.net/fluid-mechanics-forum-f6/fluid-problem-about-submerged-block-t25.htm#26 http://cecs.boardeducation.net/fluid-mechanics-forum-f6/fluid-problem-about-submerged-block-t25.htm