The document discusses various physics concepts related to forces, pressure, density and motion. It includes sample exam questions and diagrams related to topics like aerodynamics, buoyancy, atmospheric pressure, hydraulics and more. Several questions analyze diagrams of situations involving forces and ask examinees to compare variables, identify relationships and explain physical phenomena based on key principles. Sample exam responses provide multi-step working to arrive at calculated values or rankings of concepts.
Strategic design of aircraft wings have evolved over time for maximum fuel efficiency. One of such ideas involves winglet which has been known
to reduce turbulence at the tip of the wings. This study intends to investigate the
differences in drag and lift forces generated at aeroplane wings with and without winglet at cruising speed using FEM. Simulations were performed in the
SST turbulence model of CFD and the results are compared to that of the experimental and theoretical models. The simulation showed that the lift increased
by 26.0% and the drag decreased by 74.6% for the winglet at cruising speed.
A Good Effect of Airfoil Design While Keeping Angle of Attack by 6 Degreepaperpublications3
Abstract: Airfoil is a shape of wing or blade of (a propeller, rotor or turbine) by which a fluid generates an aerodynamic force. The component of this force perpendicular to the direction of its speed is called lift force and the component parallel to its speed is called drag forces. Here we see that if we set the angle of attack by 6 degree in fluid NACA0012 we found the aerodynamic forces with suitable positive result our research is totally based on iterations method and based on the help of cfd software.
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.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
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
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Normal Labour/ Stages of Labour/ Mechanism of LabourWasim Ak
Normal labor is also termed spontaneous labor, defined as the natural physiological process through which the fetus, placenta, and membranes are expelled from the uterus through the birth canal at term (37 to 42 weeks
10. Higher velocity on the upper surface
Lower pressure on the upper
surface
Lift force = Difference in pressure x
Area of surface
// difference in pressure produce lift
force
11.
12. In diagram 9.2 : less bending
In diagram 9.3: more bending
13. In diagram 9.3 : further // longer landing
distance
In diagram 9.2: shorter (landing distance)
14. The higher the lift force, the further
the landing distance
lift force is directly proportional to
landing distance
15. • Long jump // triple jump // glider
• Relationship between the lift force and
the landing distance is the higher the
lift force the further the landing
distance // directly proportional
24. Diagram 9.1 shows a boy and his father
sitting on two identical beach balls, A
and B, respectively.
SPM
2010
Their weights are balanced by the
buoyant force.
25. What is the meaning of weight?
[1 mark]
Force exerted on every object
due to gravity
26. (i) Using Diagram 9.1, compare the
weight of the boy and his father, the
volume of the water displaced and the
buoyant force acted on both of them.
[3 marks]
• The weight of the
father is higher
• The volume of water
displaced by ball B is
bigger.
•The buoyant force
acted on the father is
bigger
27. State the relationship between the
buoyant force and:
The volume of water displaced
As the volume of water displaced
increases, the buoyant force increases
The weight of water displaced
Buoyant force = weight of water
[2 marks]
displaced
Name the physics principle involved.
Archimedes principle [1 mark]
28. (c) Diagram 9.2 shows what happens when a
wooden block is held above the water surface
and then released into the
water.
When the wooden block is released, it falls into
the water and goes completely under the water
surface. Then it moves upwards and floats on
the water surface.
Using the concept of buoyant force, explain why
the wooden block moves upwards and then
floats on the water surface. [3 marks]
29. 1st : Buoyant increases when the
volume of the immersed wooden
block increases.
2nd : buoyant force is larger than the
weight when the wooden block is
moving upwards.
3rd : Buoyant force equals to weight
of the wooden block when it is
floating on the surface of water.
30. (d) The State Forestry Department is going
to organize a raft competition. As a team
leader, you are required to give some
suggestions to design a raft which can
accommodate 15 participants and be able
to move quickly in water.
31. Using your knowledge of motion,
forces and properties of materials,
state and explain the suggestions,
based on the following aspects:
The shape of the raft [2 marks]
The material used for the raft [2 marks]
The size of the raft [2 marks]
The design of the raft. [4 marks]
32. Modification Reason
Streamline shape Reduce water
resistance
Low density material Can float easily
Bigger size Can accommodate
more participants
A few layers of Displaced more
water / higher
buoyant force
Attach plastic bottle,
drum/ polisterene
To increases
buoyant force
Attach sail / paddle/
fan / motor
Increase speed
33. • Diagram 11.1 shows a hydraulic jack which is
used to lift up a car. The working principle of
the hydraulic jack is based on the Pascal's
principle.
11
SPM
2011
34. (a) (i) State the Pascal's principle. [1 mark]
11
Pressure transmitted same/uniformly/equally
(ii) Explain how the hydraulic jack can be used to
lift a car when force F1 is applied on the small
piston with cross-section area Al. In your
explanation, state the reason why force F2 is
greater than force F1. [4 marks]
M1 – force produce pressure / P=F/A
M2 – pressure equally/equal / P1=P2 /
M3 – pressure act on A2 / pressure produce force / F2
= PA2
M4 – A2 > A1 / A2 greater / ratio A2:A1 greater then 1
M2 and M3 – pressure transmitted equally on A2
35. • Diagram 11.2 shows a hydraulic brake system
in a car.
11
36. • You are required to investigate the
characteristics of a hydraulic brake system as
shown in Table 11.
11
37. 11
• Explain the suitability of each characteristic
of the hydraulic brake system. Determine the
most effective hydraulic brake to be used in a
car brake system. Give reasons for your
choice. [10 marks]
38. • M1 – incompressible
• M2 – fluid can transfer / flow / pressure transmitted /
obey Pascal Principle
• M3 – high boiling point
11
• M4 – not change to vapour / not easy to
evaporate/boil / dry out / vaporize / volume remain
constant
• M5 – high spring constant
• M6 – can withstand force / return quickly
• M7 – 1:5 / low ratio
• M8 – larger force / stop faster / easy to stop / easy to
slow down
• M9 – L
• M10 – because it is incompressible, has high boiling
point, high spring constant and low ration (1:5)
39. 11
In a hydraulic brake system, the cross-section
area of the pistons in the master cylinder and
the front wheel are 2 cm2 and 6 cm2
respectively. A force of 50 N is applied to the
piston in the master cylinder.
Calculate
(i) the pressure transmitted throughout the
brake fluid. [2 marks]
(ii) the force exerted on the piston of the front
wheel. [3 marks]
41. 9 Two identical simple
Diagram 9.1 shows
the positions P and
Q at different
altitude.
barometers are placed at
both positions. The height
of the mercury column in
the barometers are shown
in Diagram 9.2.
SPM
2012
The density of air at P is 1.2 kgm-3 and the density of air at Q
is 1.0 kgm-3
42. What is the meaning of density? [1 mark]
Mass per volume
Using Diagram 9.1 and Diagram 9.2, compare the
altitudes of P and Q, the density of surrounding air
and the height of mercury column in the simple
barometer at positions P and Q. [3 marks]
1. Altitude Q is higher
2. Density of air at Q is lower
3. Height of mercury column Q is lower
9
43. State the relationship between the altitude and
The density of the air
The atmospheric pressure
[2 marks]
The higher the altitude, the lower the density
of air
The higher the altitude, the lower the
atmospheric pressure
9
44. Diagram 9.3 shows a dropper in a bottle.
Using the knowledge of atmospheric pressure,
explain how the liquid in the bottle can be
sucked into the dropper tube.
1. Press the dropper
2. Air inside the dropper is forced
out
3. Pressure inside decrease / low
4. Release the dropper
5. Atmospheric pressure push the
liquid // difference in pressure
9
45. 9
Diagram 9.4 shows a vacuum cleaner.
You are required to give some suggestions to
design a vacuum cleaner which can clean the dust
faster and effectively. Using the knowledge on
atmospheric pressure, Bernoulli’s principle and
properties of materials, explain your suggestion
based on the following aspects:
Material used for the body of vacuum cleaner.
Material used for the hose
The size of the fan
The size of the floor nozzle
The diameter of wand
[10 marks]
46. Material Low density
Strong / plastic
Lighter
Not easily break
Material of the
hose
Flexible / elastic
Strong
Easy to adjust
Does not tear
Twist/ moveable
Size of fan Bigger fan More air can be
sucked / lower
pressure inside
Floor nozzle Wider floor
nozzle
More dust is
sucked
Diameter of the
wand
Small diameter Lower pressure /
high velocity
9
47. Diagram 11.1 shows the cross section of the wing of
an aeroplane.
Name the shape of the aeroplane’s wing.
Aerofoil
………………………………………………………..[1 mark]
11
48. Explain how the aeroplane can lift up from the track
when it moves at high speed during take off.
[4 marks]
11 SPM
2013
√1 Air faster (at) top
√2 Small pressure (at) upper
√3 difference in pressure // P2 – P1 / P1 – P2
√4 Lift / force (idea of upward force) // F = PA // F //
PA // label diagram
√5 Bernoulli’s principle
Max 4 marks
49. An aeroplane with mass of 3.6 x 105 kg and total surface area of
460 m2 is at a constant height. The resultant force acting on the
aeroplane at that moment is zero.
(i) Calculate the weight of the aeroplane. [1 mark]
3.6 x 106 N
(ii) Determine the lifting force acting on the aeroplane. [1 mark]
3.6 x 106 N
(iii) Based on the answer in 11(b)(ii), calculate the pressure
difference between the upper and lower surfaces of the wings of
the aeroplane. [3 marks]
√1 3.6 x 106 = P1A – P2A
√2 Pressure difference = (3.6 x 106/460) //
(3.528 x 106)/460
√3 7826.09 Pa
11
50. Diagram 11.2 shows four design of perfume
sprays, P, Q, R and S with different specifications.
You are required to determine the most suitable
design of a perfume spray to produce a fine spray.
Study the specifications of the four perfume
sprays based on the following aspects:
(i) Size of the squeeze bulb.
(ii) Elasticity of the squeeze bulb.
(iii) Shape of the mid tube
(iv) Size of the nozzle.
Explain the suitability of each aspect and then
determine the most suitable design of a perfume
spray. Give reason for your choice.
[10 marks]
11
52. √1 Big
11
√2 contain more air, produce greater pressure
√3 Elastic
√4 Less compression force required // easy to return to
original shape
√5 narrower at the middle of the tube
√6 Air travel faster to create lower pressure
√7 Small size
√8 Liquid carried out from the nozzle in a tiny droplets
// large coverage // increase coverage / area
√9 Perfume spray R
√10 Big size of squeeze-bulb, elastic squeeze-bulb,
narrower shape of the tube at the middle and small size
of nozzle