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Fluid Mechanics:-   Mechanics is frequently asked in GATE and other PSU exams carrying medium marks weightage. Fluid statics comprises of topics Pascals Law, the pressure at a point and general equation for variation of pressure. Fluid Statics:-    1. Fluid statics deals with problems associated with fluids at rest. The fluid can be either gaseous or liquid. 2. Fluid statics is generally referred to as hydrostatics when the fluid is a liquid and as aerostatics when the fluid is a gas. 3. The only stress we deal with in fluid statics is the normal stress, which is the pressure, and the variation of pressure is due to only the weight of the fluid. Therefore, the topic of fluid statics has significance only in gravity fields, and the force relations developed naturally involve the gravitational acceleration (g). 4. The force exerted on a surface by a fluid at rest is normal to the surface at the point of contact since there is no shear forces due to the absence of relative m...

  STRAIN:-   When a prismatic bar is subjected to axial load, it undergoes a change in length, as indicated in Figure. This change in length is usually called deformation.                                                               Or  In simple terms the definition is The strain is equal to the ratio of change in length of the body to the original length.                                      If the axial force is tensile, the length of the bar is increased, while if the axial force is compressive, there is shortening of the length of the bar. The deformation (i.e. elongation or shortening) per unit length of the bar is termed as strain and denoted by ε or e.                 ...

  Linear Programming:   A linear programming is defined as it is the optimization of a linear function of variables subject to the constraint of linear inequalities. A Linear Programming Problem (LPP) consists of three components namely Decision Variables (Activities) The Objective (Goal) The Constraints (Restrictions) Decision Variables (Activities):   The decision variables refer to the economic or physical quantities, which are competing with one another for sharing the given limited resources. The relationship among these variables must be linear under linear programming. The numerical values of decision variables indicate the solution of the linear programming problem Objective (Goal):   The objective function of a linear programming problem is a linear function of the decision variable expressing the objective of the decision maker. For example, maximisation of profit or contribution, minimization of cost/time The Constraints (Restriction): The constraints indi...

  Inventory Control and Management   Inventory is defined as the list of movable goods which helps directly or indirectly in the production of goods for sale. We can also be defined inventory as a comprehensive list of movable items which are required for manufacturing the products and to maintain the plant facilities in working conditions. It can be divided into two parts Direct Inventories The inventories which play a direct role in the manufacturing of a product and become an integral part of the finished product are called direct inventories, e.g., raw materials, purchases part and finished goods. Raw material inventories are provided for economical bulk purchasing to enable production rate changes  to provide production buffer against delays in transportation for seasonal fluctuations. Work-in-process inventories are provided : to enable economical lot production to cater to the variety of products  for replacement of wastages to maintain uniform production even...

  Stress and Strain     Stress and Strain is the first topic in Strength of Materials which consist of various types of stresses, strains and different properties of materials which are important while working on them. Stress:   The force of resistance per unit area, offered by a body against deformation is known as  stress . It is denoted by a symbol ‘σ’. And mathematically expressed as As particular stress generally holds true only at a point, therefore it is defined mathematically as TYPES OF STRESSES : only two basic stresses exist. (1) Normal stress and (2) Shear stress. (i) Normal stresses: If the force applied are perpendicular or normal to areas concerned, then these are termed as normal stresses. The normal stresses are generally denoted by a Greek letter (σ). Stress =Force applied/Area (ii) Shear Stress:  when cross-sectional area of a block of material is subject to a distribution of forces which are parallel to the area of it.These forces are as...

Physics Classes by Sumit   Hello friends here in this video we'll discuss the  topic on Ohm's Law, So let start  Ohm's Law   Ohm's law states that, at constant Temperature the Current  flowing through the conductor is directly proportional to the Potential differences between the two points . Where, "R" is a constant value                 I = Electric Current                  V= Potential Difference  Resistance :- it is a conductor to resist the.                            flow of charge. It depends on the length, Area of cross-section, nature of the material and also on the temperature of the conductor. Its SI Unit is Ohm ( Ω )   Note:- If the potential difference between two points of a conductor is 1V and the current flowing through it is 1A, then the Resistance "R" will be 1Ω.    ...