Solid pressure is defined as the force acting on a given area, measured in Pascals. Fluid pressure results from particle collisions within the fluid and increases with depth and density. It is described by the equation P=hρg. Atmospheric pressure decreases with altitude and is measured using barometers. Fluids transfer pressure equally in all directions according to Pascal's principle, which has applications in hydraulic systems. Archimedes' principle describes buoyancy as the upward force equal to the weight of fluid displaced. Bernoulli's principle states that fluid pressure decreases where velocity increases, as seen in aerofoils, venturi nozzles, and other streamlined objects.
PLEASE NOTE THIS IS PART-1
By Referring or said Learning This Presentation You Can Clear Your Basics Fundamental Doubts about Fluid Mechanics. In this Presentation You Will Learn about Fluid Pressure, Pressure at Point, Pascal's Law, Types Of Pressure and Pressure Measurements.
FLUID FLOW
A fluid is a substance that continually deforms (flows) under an applied shear stress. Fluids are a subset of the phases of matter and include liquids, gases.
“Fluid flow may be defined as the flow of substances that do not permanently resist distortion”
The subject of fluid flow can be divided into-
fluid statics
fluid dynamics
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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2. Solid Pressure
Magnitude of force acting on a given area
Pressure, P = Force, F / Area, A
unit = Nm-2 or
Pascal, Pa
Although force is a vector quantity, pressure is a scalar
quantity.
This is because experimentally, pressure acts equally in all
directions, producing no net direction
3. Fluid Pressure
Pressure that results from the collision of particles in
fluid
Particle collision are mostly elastic, thus conserving
kinetic energy and momentum (mv)
The change in direction after collision results in a rate of
change in momentum, producing impulsive force.
This force acts on a given area, produces pressure
Increasing depth of fluid (amount of fluid) and its density
increases particle collision, resulting in increasing
pressure
4.
Pressure, P = h ρ g where depth of fluid = h, density of
fluid = ρ, acceleration due to gravity = g
Unit = kgm-1s-2 or Pascal (Pa)
Other units commonly used:
PSI (pounds per square inch) – Imperial system
Bar
atm (where 1 atm = 105 Pa = 76cmHg)
mmHg/cmHg/mmH2O/cmH2O
5. Atmospheric Pressure (Patm)
Pressure exerted by the particles in the atmosphere on
every surface on Earth
Changes with altitude because the density of the
atmosphere changes with altitude. (Density and therefore
pressure decreases as altitude increases)
Patm at sea level (average height of ocean) ≈1 X 105 Pa
Patm at peak of Mt. Everest ≈3.33 X 104 Pa
6.
In tubes A, B, C, D and E, the height of level of water is
identical because pressure is equal in all tubes (P atm)
This shows that pressure is not influenced by the shape
or orientation of the tube
7.
The instrument used to measure atmospheric pressure is
known as a barometer. (Baro = pressure)
Types of barometers:
Mercury barometer
Aneroid barometer
9.
Fluid used in barometer has to have the following
properties:
Incompressible
Does not evaporate easily
Does not stick to the wall of the barometer
Ideal fluid to be used is mercury (Hg)
10.
Atmospheric pressure is measured by
Patm = <Height of column><Name of fluid>
Patm = 76cmHg
To convert cmHg to the S.I. unit, Pa:
Patm = hρg
Patm = (76/100) X 1.36x103(density of Hg) X 10
Patm = 1x105 Pa
11.
If water is used in substitute for mercury, the column
height can be calculated:
Patm = hρg
1x105 = h X 1x103 X 10
105 = h X 104
h = 10m
Having a column height of 10m makes the water
barometer unfitting and immobile.
14. Gas pressure (Pgas)
Pressure exerted by gas particles on surrounding surfaces
Measured by an instrument known as a manometer (Utube)
In a manometer, the fluid pressure at one point in one
arm is equal to the pressure at another point in the
opposite arm at the same level, where the type of fluid is
the same
15. Manometer
Level of fluid on
both sides is the
same as both ends
are exerted by the
same pressure,
Patm
19. Transfer of pressure within static fluid
When an object is submerged in a fluid, it experiences
equal pressure from all directions. The pressure is
transferred equally in the fluid in all directions.
Hence, neglecting pressure changes due to depth, the
pressure at any given point within the fluid is constant.
Pascal’s Principle
In a closed system of fluids, any pressure exerted is equally
distributed throughout the fluid and remains constant
Characteristics of the hydraulic fluid:
Incompressible
Does not adhere to the surface of the system
Is not volatile
21.
Since pressure is evenly distributed,
P 1 = P2
Thus,
F1/A1 = F2/A2
When one piston is depressed, the other piston rises.
This occurs as the volume displaced by the fluid from the
first piston occupies the space at the second piston
V1 = V 2
Thus,
d1A1 = d2A2
where A = surface area of piston, d = distance moved by
piston
22.
Applications of Pascal’s Principle:
Hydraulic jacks
Hydraulic robots and machinery
Vehicle brakes and steering
23. Support due to pressure in fluids
With reference to Newton’s Law of Motion, every action
of force has a normal that acts in the opposing direction.
Weight is a force and has a normal support on solid
ground. When an object is immersed in fluid, the normal
support is produced from the pressure differential at the
upper and lower surface of the object.
This supportive force provides floatation and is known as
buoyancy.
Archimedes’ Principle
When an object is partially or completely immersed in a fluid,
the weight of the fluid displaced is equivalent to the buoyant
force that supports the object
24.
Buoyant force, B = V ρ g, where V volume of immersed
part of the object, ρ = density of fluid, g = acceleration
due to gravity
Buoyant force is also equivalent to weight of object when
not immersed (true weight) – weight of object when
immersed (apparent weight)
B = Wt - Wa
An object sinks when Wt > B
An object floats when Wt = B
25.
In a uniformly distributed fluid, buoyant force remains
constant regardless of depth of fluid.
Buoyant force changes in direct proportion to fluid
density.
Fluid density increases when
Temperature decreases
Concentration increases
Pressure increases
Mass increases
26.
Applications on Archimedes’ Principle
Submarine
Plimsoll Scale on the hull ships
Hot air balloon
Hydrometer
Cartesian diver
Measuring volume of kings’ crowns using a bath tub and an old
genius
27. Differential pressure in fluid flow
High fluid pressure
Fp
Low fluid pressure
vt
vf
Direction of motion
28.
Imagine a particle moving uniformly in a fluid of gradually
decreasing pressure. The pressure behind the particle is
greater than the pressure in front.
A force (Fp)will be produced in the direction of motion
resulting in acceleration of the particle, thus the velocity
of the accelerating particle at the back (vt) is greater than
at the front (vf).
This shows that pressure and velocity are inversely
related
Bernoulli’s Principle
Pressure and velocity of a fluid are inversely proportional as a
result of the fluid flowing in a curved streamline.
30.
In fluid mechanics, it is generally accepted that liquids and
gases flow in arranged packets known as streamlines.
An aerofoil has an aerodynamic shape which is meant to
redirect air streamlines in order to minimise resistance
and produce lift
Curvature of the streamline occurs when the air is
passed above the aerofoil due to the shape of the
aerofoil.
The curvature decreases the air velocity of the streamline
above the aerofoil resulting in the pressure below the
aerofoil to be greater than above.
The differential pressure produces the aerodynamic lift.
31.
The greater the curvature of the streamline, the greater
the decrease in velocity.
The streamline curvature above the aerofoil can be
increased by increasing the angle of attack (the angle at
which the aerofoil meets the streamline)
However, if the angle of attack is too large, the
streamlines about the aerofoil could converge and
dissipate. This diminishes the lift, an event known as stall.
Aircraft wings can deploy slats and flaps to increase
surface area to give extra lift for take off or to increase
air resistance to provide additional drag for landing and
decelerating.