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Scalars & Vectors,Motion,Motion in two Dimension,Torque, Angular, Momentum & Equilibrium,Gravitation,Work, Power & Energy
Posted by altaf
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Recent Posts
- Scalars and Vectors
- Motion
- Motion in two Dimension
- Torque, Angular, Momentum and Equilibrium
- Gravitation
- Work, Power and Energy
Scalars and Vectors
Scalars
Physical quantities which can be completely specified by1. A number which represents the magnitude of the quantity.
2. An appropriate unit
are called Scalars.
Scalars quantities can be added, subtracted multiplied and divided by usual algebraic laws.
Examples
Mass, distance, volume, density, time, speed, temperature, energy, work, potential, entropy, charge etc.
Vectors
Physical quantities which can be completely specified by1. A number which represents the magnitude of the quantity.
2. An specific direction
are called Vectors.
Special laws are employed for their mutual operation.
Examples
Displacement, force, velocity, acceleration, momentum.
Representation of a Vector
A straight line parallel to the direction of the given vector used to represent it. Length of the line on a certain scale specifies the magnitude of the vector. An arrow head is put at one end of the line to indicate the direction of the given vector.
The tail end O is regarded as initial point of vector R and the head P is regarded as the terminal point of the vector R.
Unit Vector
A vector whose magnitude is unity (1) and directed along the direction of a given vector, is called the unit vector of the given vector.
A unit vector is usually denoted by a letter with a cap over it. For example if r is the given vector, then r will be the unit vector in the direction of r such that
r = r .r
Or
r = r / r
unit vector = vector / magnitude of the vector
Equal Vectors
Two vectors having same directions, magnitude and unit are called equal vectors.
Zero or Null Vector
A vector having zero magnitude and whose initial and terminal points are same is called a null vector. It is usually denoted by O. The difference of two equal vectors (same vector) is represented by a null vector.
R - R - O
Free Vector
A vector which can be displaced parallel to itself and applied at any point, is known as free vector. It can be specified by giving its magnitude and any two of the angles between the vector and the coordinate axes. In 3-D, it is determined by its three projections on x, y, z-axes.
Position Vector
A vector drawn from the origin to a distinct point in space is called position vector, since it determines the position of a point P relative to a fixed point O (origin). It is usually denoted by r. If xi, yi, zk be the x, y, z components of the position vector r, then
r = xi + yj + zk
Negative of a Vector
The vector A. is called the negative of the vector A, if it has same magnitude but opposite direction as that of A. The angle between a vector and its negative vector is always of 180º.
Multiplication of a Vector by a Number
When a vector is multiplied by a positive number the magnitude of the vector is multiplied by that number. However, direction of the vector remain same. When a vector is multiplied by a negative number, the magnitude of the vector is multiplied by that number. However, direction of a vector becomes opposite. If a vector is multiplied by zero, the result will be a null vector.
The multiplication of a vector A by two number (m, n) is governed by the following rules.
1. m A = A m
2. m (n A) = (mn) A
3. (m + n) A = mA + nA
4. m(A + B) = mA + mB
Division of a Vector by a Number (Non-Zero)
If a vector A is divided by a number n, then it means it is multiplied by the reciprocal of that number i.e. 1/n. The new vector which is obtained by this division has a magnitude 1/n times of A. The direction will be same if n is positive and the direction will be opposite if n is negative.
Resolution of a Vector Into Rectangular Components
DefinitionSplitting up a single vector into its rectangular components is called the Resolution of a vector.
Rectangular Components
Components of a vector making an angle of 90º with each other are called rectangular components.
Procedure
Let us consider a vector F represented by OA, making an angle O with the horizontal direction.
Draw perpendicular AB and AC from point on X and Y axes respectively. Vectors OB and OC represented by Fx and Fy are known as the rectangular components of F. From head to tail rule of vector addition.
OA = OB + BA
F = Fx + Fy
Fx / F = Cos θ => Fx = F cos θ
Fy / F = sin θ => Fy = F sin θ
Consider two vectors A1 and A2 making angles θ1 and θ2 with x-axis respectively as shown in figure. A1 and A2 are added by using head to tail rule to give the resultant vector A.
Step 1
For the x-components of A, we add the x-components of A1 and A2 which are A1x and A2x. If the x-components of A is denoted by Ax then
Ax = A1x + A2x
Taking magnitudes only
Ax = A1x + A2x
Or
Ax = A1 cos θ1 + A2 cos θ2 ................. (1)
Step 2
For the y-components of A, we add the y-components of A1 and A2 which are A1y and A2y. If the y-components of A is denoted by Ay then
Ay = A1y + A2y
Taking magnitudes only
Ay = A1y + A2y
Or
Ay = A1 sin θ1 + A2 sin θ2 ................. (2)
Step 3
Substituting the value of Ax and Ay from equations (1) and (2) respectively in equation (3) below, we get the magnitude of the resultant A
A = |A| = √ (Ax)2 + (Ay)2 .................. (3)
Step 4
By applying the trigonometric ratio of tangent θ on triangle OAB, we can find the direction of the resultant vector A i.e. angle θ which A makes with the positive x-axis.
tan θ = Ay / Ax
θ = tan-1 [Ay / Ax]
Here four cases arise
(a) If Ax and Ay are both positive, then
θ = tan-1 |Ay / Ax|
(b) If Ax is negative and Ay is positive, then
θ = 180º - tan-1 |Ay / Ax|
(c) If Ax is positive and Ay is negative, then
θ = 360º - tan-1 |Ay / Ax|
(d) If Ax and Ay are both negative, then
θ = 180º + tan-1 |Ay / Ax|
Addition of Vectors by Law of Parallelogram
According to the law of parallelogram of addition of vectors, if we are given two vectors. A1 and A2 starting at a common point O, represented by OA and OB respectively in figure, then their resultant is represented by OC, where OC is the diagonal of the parallelogram having OA and OB as its adjacent sides.R = A1 + A2
Or
OC = OA + OB
But OB = AC
Therefore,
OC = OA + AC
β is the angle opposites to the resultant.
Magnitude of the resultant can be determined by using the law of cosines.
R = |R| = √A1(2) + A2(2) - 2 A1 A2 cos β
Direction of R can be determined by using the Law of sines.
A1 / sin γ = A2 / sin α = R / sin β
This completely determines the resultant vector R.
Properties of Vector Addition
1. Commutative Law of Vector Addition (A+B = B+A)
Consider two vectors A and B as shown in figure. From figure
OA + AC = OC
Or
A + B = R .................... (1)
And
OB + BC = OC
Or
B + A = R ..................... (2)
Since A + B and B + A, both equal to R, therefore
A + B = B + A
Therefore, vector addition is commutative.
2. Associative Law of Vector Addition (A + B) + C = A + (B + C)
Consider three vectors A, B and C as shown in figure. From figure using head - to - tail rule.
OQ + QS = OS
Or
(A + B) + C = R
And
OP + PS = OS
Or
A + (B + C) = R
Hence
(A + B) + C = A + (B + C)
Therefore, vector addition is associative.
Product of Two Vectors
1. Scalar Product (Dot Product)
2. Vector Product (Cross Product)
1. Scalar Product OR Dot Product
If the product of two vectors is a scalar quantity, then the product itself is known as Scalar Product or Dot Product.
The dot product of two vectors A and B having angle θ between them may be defined as the product of magnitudes of A and B and the cosine of the angle θ.
A . B = |A| |B| cos θ
A . B = A B cos θ
The scalar product of vector A and vector B is equal to the magnitude, A, of vector A times the projection of vector B onto the direction of A.
If B(A) is the projection of vector B onto the direction of A, then according to the definition of dot product.
A . B = A B cos θ {since B(A) = B cos θ}
Examples of dot product are
W = F . d
P = F . V
Commutative Law for Dot Product (A.B = B.A)
If the order of two vectors are changed then it will not affect the dot product. This law is known as commutative law for dot product.
A . B = B . A
if A and B are two vectors having an angle θ between then, then their dot product A.B is the product of magnitude of A, A, and the projection of vector B onto the direction of vector i.e., B(A).
And B.A is the product of magnitude of B, B, and the projection of vector A onto the direction vector B i.e. A(B).
In Δ PQR,
cos θ = A(B) / A => A(B) = A cos θ
In Δ ABC,
cos θ = B(A) / B => B(A) = B cos θ
Therefore,
A . B = A B(A) = A B cos θ
B . A = B A (B) = B A cos θ
A B cos θ = B A cos θ
A . B = B . A
Thus scalar product is commutative.
Distributive Law for Dot Product
A . (B + C) = A . B + A . C
Consider three vectors A, B and C.
B(A) = Projection of B on A
C(A) = Projection of C on A
(B + C)A = Projection of (B + C) on A
Therefore
A . (B + C) = A [(B + C}A] {since A . B = A B(A)}
= A [B(A) + C(A)] {since (B + C)A = B(A) + C(A)}
= A B(A) + A C(A)
= A . B + A . C
Therefore,
B(A) = B cos θ => A B(A) = A B cos θ1 = A . B
And C(A) = C cos θ => A C(A) = A C cos θ2 = A . C
Thus dot product obeys distributive law.
2. Vector Product OR Cross Product
When the product of two vectors is another vector perpendicular to the plane formed by the multiplying vectors, the product is then called vector or cross product.
The cross product of two vector A and B having angle θ between them may be defined as "the product of magnitude of A and B and the sine of the angle θ, such that the product vector has a direction perpendicular to the plane containing A and B and points in the direction in which right handed screw advances when it is rotated from A to B through smaller angle between the positive direction of A and B".
A x B = |A| |B| sin θ u
Where u is the unit vector perpendicular to the plane containing A and B and points in the direction in which right handed screw advances when it is rotated from A to B through smaller angle between the positive direction of A and B.
Examples of vector products are
(a) The moment M of a force about a point O is defined as
M = R x F
Where R is a vector joining the point O to the initial point of F.
(b) Force experienced F by an electric charge q which is moving with velocity V in a magnetic field B
F = q (V x B)
Physical Interpretation of Vector OR Cross Product
Area of Parallelogram = |A x B|
Area of Triangle = 1/2 |A x B|
Posted by muneebahmed
Motion
DefinitionIf an object continuously changes its position with respect to its surrounding, then it is said to be in state of motion.
Rectilinear Motion
The motion along a straight line is called rectilinear motion.
Velocity
Velocity may be defined as the change of displacement of a body with respect time.Velocity = change of displacement / time
Velocity is a vector quantity and its unit in S.I system is meter per second (m/sec).
Average Velocity
Average velocity of a body i...
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Motion in two Dimension
Projectile Motion
A body moving horizontally as well as vertically under the action of gravity simultaneously is called a projectile. The motion of projectile is called projectile motion. The path followed by a projectile is called its trajectory.Examples of projectile motion are
1. Kicked or thrown balls
2. Jumping animals
3. A bomb released from a bomber plane
4. A shell of a gun.
Analysis of Projectile Motion
Let us consider a body of mass m, projected an angle θ with the horizonta...
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Torque, Angular, Momentum and Equilibrium
Torque or Moment of Force
DefinitionIf a body is capable of rotating about an axis, then force applied properly on this body will rotate it about the axis (axis of rotating). This turning effect of the force about the axis of rotation is called torque.
Torque is the physical quantity which produces angular acceleration in the body.
Explanation
Consider a body which can rotate about O (axis of rotation). A force F acts on point P whose position vector w.r.t O is r.
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Gravitation
The property of all objects in the universe which carry mass, by virtue of which they attract one another, is called Gravitation.Centripetal Acceleration of the Moon
Newton, after determining the centripetal acceleration of the moon, formulated the law of universal gravitation.Suppose that the moon is orbiting around the earth in a circular orbit.
If V = velocity of the moon in its orbit,
Rm = distance between the centres of earth and moon,
T = time taken by the moon to c...
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Work, Power and Energy
Work
Work is said to be done when a force causes a displacement to a body on which it acts.Work is a scalar quantity. It is the dot product of applied force F and displacement d.
W = F . d
W = F d cos θ .............................. (1)
Where θ is the angle between F and d.
Equation (1) can be written as
W = (F cos θ) d
i.e., work done is the product of the component of force (F cos θ) in the direction of displacement and the magnitude of displacement d.
equ...
Physics Notes for Metric (x) Class (Karachi Board)
Posted by altaf
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Physics Notes for Metric Class (Karachi Board)
Dear Students, you are welcome to Study Guide Centre. We are presenting the Notes for Metric class, Karachi Board.Here are the notes for Physics.
Metric Class:
Chapter # 1: Introduction
Chapter # 2: Measurments
Chapter #3 : Scalars and Vectors
Chapter #4 : Kinematics
Chapter #5 : Force and Motion
Chapter # 6: Statics
Chapter # 7: Circular Motion and Gravitation
Chapter # 8: Work Energy and Power
Chapter # 9: Machines
Chapter # 10: Matter
Chapter # 11: Heat
Chapter # 12: Waves and Sounds
Chapter # 13: Propagation and Reflection of Light
Chapter # 14: Reflection of Light and Optical Instruments
Chapter # 15: Nature of Light and Electromagnetics spectrum
Chapter # 16: Electricity
Chapter # 17: Magnetic and Electromagnetism
Chapter # 18: Electronics
Chapter # 19: Nuclear Physics
Lockheed P-3 Orion
Posted by altaf
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Lockheed P-3 Orion
The Lockheed P-3 Orion is a four-engine turboprop anti-submarine and maritime surveillance aircraft developed for the United States Navy and introduced in the 1960s. Lockheed based it on the L-188 Electra commercial airliner.The aircraft is easily recognizable by its distinctive tail stinger or "MAD Boom", used for the magnetic detection of submarines. Over the years, the aircraft saw numerous design advancements, most notably to its electronics packages. The P-3 Orion is still in use by numerous navies and air forces around the world, primarily for maritime patrol, reconnaissance, anti-surface warfare and anti-submarine warfare. A total of 734 P-3s have been built, and by 2012, it will join the handful of military aircraft such as the Boeing B-52 Stratofortress which have served 50 years of continuous use with its original primary customer, in this case, the United States Navy.
Development
In August 1957, the US Navy called for replacement proposals for the aging twin piston engined Lockheed P2V Neptune (later redesignated P-2) and Martin P5M Marlin (later redesignated P-5) with a more advanced aircraft to conduct maritime patrol and antisubmarine warfare. Modifying an existing aircraft was expected to save on cost and allow rapid introduction into the fleet. Lockheed suggested a military version of their L-188 Electra, which was still in development and had yet to fly. In April 1958 Lockheed won the competition and was awarded an initial research and development contract in May.
The prototype YP3V-1/YP-3A BuNo 148276 was in fact modified from the third Electra airframe c/n 1003.The first flight of the aircraft's aerodynamic prototype, originally designated YP3V-1, was on 19 August 1958. While based on the same design philosophy as the Lockheed L-188 Electra, the aircraft was structurally different. The aircraft had 7 meters (23 ft) less fuselage forward of the wings with an opening bomb bay, as well as a more pointed nose radome, distinctive tail "stinger", wing hardpoints, and other internal, external, and airframe production technique enhancements.The Orion has four Allison T56 turboprops which give it a top speed of 411 knots (761 km/h) comparable to the fastest propeller fighters, or even slow low-bypass turbofan jets such as the A-10 Thunderbolt II or the S-3 Viking. Similar aircraft include the Soviet Ilyushin Il-38 and the French Breguet Atlantique while the UK the British adapted the jet-powered de Havilland Comet into the Hawker Siddeley Nimrod.
P-3 Orion from Japan, Canada, Australia, Republic of Korea and the United States. |
In 1963, the U.S. Navy, Bureau of Weapons, contracted Univac Defense Systems Division of Sperry-Rand to engineer, build and test a digital computer (then in its early infancy) to interface with the many sensors and newly developing display units of the P3 Orion. Project A-NEW was the engineering system which, after several early trials, produced the engineering prototype, the CP-823/U, Univac 1830, Serial A-1, A-NEW MOD3 Computing System. The CP-823/U Engineering Prototype Computer was delivered to the Naval Air Development Center (NADC) at Johnsville, Pa in 1965. It was the testbed computer unit that led to the production computer for the P-3C Orion.
The civilian Electra suffered mysterious crashes such as a 1960 flight when the right wing ripped away due to flutter caused by vibrations in the engine mounts. Sales of airliners were limited as the technical fix did not completely erase the "jinxed" reputation while turboprops were soon replaced by faster jets. In military missions where fuel efficiency was more important than speed, the Orion would remain in service nearly 50 years after its 1962 introduction. Although not quite matching the longevity of the still-in-production C-130 Hercules, which was the original application of the Allison T56 turboprop, 734 P-3s were produced until 1990. Lockheed Martin opened a new P-3 wing production line in 2008 as part of its Service Life Extension Program (ASLEP) for delivery in 2010. A complete ASLEP replaces the aircraft outer wings, center wing lower section and horizontal stabilizers with new-build parts
The Lockheed Electra had been created as cost-effective alternative to the Boeing 707 (first prototype flight in 1954) when turboprops are very efficient at flight speeds below 450 mph compared to early turbojets. The improved P-7 was selected over a variant of the Boeing 757, but was cancelled. The further advanced Orion 21 lost out to the Boeing P-8 Poseidon. Due to enter service in 2013, the P-8 is an evolution of designs dating back to the original 707 as the Boeing 737 airliner has grown to become a slightly larger airframe than the 707 prototype, powered by very efficient low-bypass turbofans with more power.
Design
The P-3 has an internal bomb bay under the front fuselage which can house conventional Mark 50 torpedoes or Mark 46 torpedoes and/or special (nuclear) weapons. Additional underwing stations, or pylons, can carry other armament configurations including the AGM-84 Harpoon, AGM-84E SLAM, AGM-84H/K SLAM-ER, the AGM-65 Maverick, 127 millimeters (5 in) Zuni rockets, and various other sea mines, missiles, and gravity bombs. The aircraft also had the capability to carry the AGM-12 Bullpup guided missile until that weapon was withdrawn from U.S./NATO/Allied service.
Crew complement
The crew complement varies depending on the role being flown, the variant being operated, and the country that is operating the type. In US Navy service, the normal complement is 11.Data for P-3C only.
- three Naval Aviators
- Patrol Plane Commander (PPC)
- Patrol Plane 2nd Pilot (PP2P)
- Patrol Plane 3rd Pilot (PP3P)
- two Naval Flight Officers
- Patrol Plane Tactical Coordinator (PPTC or TACCO)
- Patrol Plane Navigator/Communicator (PPNC or NAVCOM) (Nav/Comm on P-3C only. P-3A & P-3B had NFO Navigator and also enlisted radio operator)
- two enlisted aircrew flight engineers (FE1 and FE2)
- three enlisted sensor operators
- Radar/MAD/AWO (SS-3)
- two Acoustic (SS-1 and SS-2)
- one enlisted in-flight technician (IFT)
- one aviation ordnanceman (ORD position no longer used on USN crews; duties assumed by IFT.)
Engine loiter shutdown
Once on station, one engine is often shut down (usually the No. 1 engine - the port outer engine) to conserve fuel and extend the time aloft and/or range when at low level. On occasion, both outboard engines can be shut down, weight, weather, and fuel permitting. Long deep-water, coastal or border patrol missions can last over 10 hours and may include extra crew. The record time aloft for a P-3 is 21.5 hours, undertaken by the Royal New Zealand Air Force's No. 5 Squadron in 1972.
Engine 1 is the primary candidate for loiter shutdown because uniquely it has no generator, and provides no electrical power. Eliminating the exhaust from engine 1 also improves visibility from the aft observer station on the port side of the aircraft.Operational history
P-3B of VP-6 near Hawaii |
US P-3C Orion of VP-8 |
Changing a tire on a P-3C |
More than 40 combatant and noncombatant P-3 variants have demonstrated the rugged reliability displayed by the platform flying 12-hour plus missions 200 ft (61 m) over salt water while maintaining an excellent safety record. Versions have been developed for the National Oceanic and Atmospheric Administration (NOAA) for research and hurricane hunting/hurricane wall busting, for the U.S. Customs Service (now U.S. Customs and Border Protection) for drug interdiction and aerial surveillance mission with a rotodome adapted from the Grumman E-2 Hawkeye or an AN/APG-66 radar adapted from the General Dynamics F-16 Fighting Falcon, and for NASA for research and development.
The United States Navy remains the largest P-3 operator, currently distributed between a single fleet replacement (i.e., "training) patrol squadron, 12 active duty patrol squadrons, two Navy Reserve patrol squadrons, two active duty special projects patrol squadrons and two active duty test and evaluation squadrons. Two additional active duty fleet reconnaissance squadrons operate the EP-3 Aries signals intelligence (SIGINT) variant.
Cuba
Main article: Cuban Missile Crisis
In October 1962, P-3A aircraft flew several blockade patrols in the vicinity of Cuba. Having just recently joined the operational Fleet earlier that year, this was the first employment of the P-3 in a real world "near conflict" situation.Vietnam
Main article: Operation Market Time
Beginning in 1964, forward deployed P-3 aircraft began flying a variety of missions under Operation Market Time from bases in the Philippines and Vietnam. The primary focus of these coastal patrols was to stem the supply of materials to the Viet Cong by sea, although several of these missions also became overland "feet dry" sorties. During one such mission, a small caliber artillery shell passed through a P-3 without rendering it mission incapable. During another overland mission, it is rumored, but not confirmed, that a P-3 shot down a North Vietnamese MiG with Zuni missiles.The only confirmed combat loss of a P-3 also occurred during Operation Market Time. In April 1968, a U.S. Navy P-3B of Patrol Squadron 26 (VP-26) was downed by anti-aircraft artillery (AAA) fire in the Gulf of Thailand with the loss of the entire crew. Two months earlier, in February 1968, another one of VP-26's P-3B aircraft was operating in the same vicinity when it crashed with the loss of the entire crew. Originally attributed to an aircraft mishap at low altitude, later conjecture is that this aircraft may have also fallen victim to AAA fire from the same source as the April incident.Iraq
Main articles: Desert Shield, Desert Storm, and Operation Iraqi Freedom
On 2 August 1990, Iraq invaded Kuwait and was poised to strike Saudi Arabia. Within forty-eight hours of the initial invasion, U.S. Navy P-3C aircraft were the first American forces to arrive in the area. One was a modified platform with a prototype system known as "Outlaw Hunter." Undergoing trials in the Pacific after being developed by the Navy’s Space & Naval Warfare Systems Command, "Outlaw Hunter" was testing a specialized over-the-horizon targeting (OTH-T) system package when it responded. Within hours of the start of the coalition air campaign, "Outlaw Hunter" detected a large number of Iraqi patrol boats and naval vessels attempting to move from Basra and Umm Qasr to Iranian waters. "Outlaw Hunter" vectored in strike elements which attacked the flotilla near Bubiyan Island destroying 11 vessels and damaging scores more. During Desert Shield, a P-3 using infrared imaging detected a ship with Iraqi markings beneath freshly painted bogus Egyptian markings trying to avoid detection. Several days before the 7 January 1991 commencement of Operation Desert Storm, a P-3C equipped with an APS-137 Inverse Synthetic Aperture Radar (ISAR) conducted coastal surveillance along Iraq and Kuwait to provide pre-strike reconnaissance on enemy military installations. A total of 55 of the 108 Iraqi vessels destroyed during the conflict were targeted by P-3C aircraft.The P-3 Orion's mission expanded in the late 1990s and early 2000s to include battlespace surveillance both at sea and over land. The long range and long loiter time of the P-3 Orion have proved to be an invaluable asset during Operation Iraqi Freedom. It can instantaneously provide information about the battlespace it can see to ground troops, particularly the U.S. Marines.
Afghanistan
Main article: War in Afghanistan (2001–present)
Although the P-3 is a Maritime Patrol Aircraft, armament and sensor upgrades in the Anti-surface Warfare Improvement Program (AIP) have made it suitable for sustained combat air support over land. Since the start of the current war in Afghanistan, U.S. Navy P-3 aircraft have been operating from Kandahar in that role.Royal Australian Air Force P-3 aircraft also operated there early in the war. As of February 2010, the Australian P-3 aircraft have been operating in the area for a continuous 7 years.Recently the United States Geological Survey used the Orion to survey parts of southern and eastern Afghanistan for lithium, copper, and other mineral deposits.
Pakistan
Pakistan had four P-3 Orions in service until 22 May 2011, when two P-3s were destroyed in an attack by Pakistan's Taliban on a naval base in Karachi by gunmen who used rocket propelled-grenades to target the P-3s in hangers..Somalia
Main article: Piracy in Somalia
A US Navy P-3C Orion monitoring the hijacking of MV Maersk Alabama, 2009. |
Libya
Main article: Libyan Civil War
US Navy P-3C Orions and one Canadian CP-140 Aurora, a variant of the Orion, participate in maritime surveillance missions over Libyan waters in the framework of enforcement of the 2011 no-fly zone over Libya.A US Navy P-3C Orion supporting Operation Odyssey Dawn engaged the Libyan coast guard vessel Vittoria on March 28, 2011 after the vessel and two smaller craft fired on merchant ships in the port of Misurata, Libya. The Orion fired an AGM-65 Maverick on the Vittoria, which was subsequently beached.
Civilian uses
NOAA WP-3D Hurricane Hunters |
Aero Union, Inc. operates eight ex-USN P-3A aircraft configured as air tankers, which are leased to the U.S. Forest Service, the California Department of Forestry and Fire Protection and other agencies for firefighting use. Several of these aircraft were involved in the U.S. Forest Service airtanker scandal but have not been involved in any catastrophic aircraft mishaps.
Latin America
Admiral Stavridis stated in a speech in January 2011 that P-3s have been used to hunt down "third generation" narco subs. This is significant due to as recently as July 2009 fully submersible submarines have begun to be used in smuggling operations.Variants
Main article: P-3 Orion variants
Over the years, numerous variants of the P-3 have been created. A few notable examples are:- WP-3D: Two P-3C aircraft as modified on the production line for NOAA weather research, including hurricane hunting.
- EP-3E Aries: 10 P-3A and 2 EP-3B aircraft converted into ELINT aircraft.
- EP-3E Aries II: 12 P-3C aircraft converted into ELINT aircraft.
- AP-3C: All Royal Australian Air Force P-3C/W aircraft which have been fully upgraded with totally new mission systems by L-3 Communications to include an Elta SAR/ISAR RADAR and a GD-Canada Acoustic Processor system.
- Lockheed CP-140 Aurora: Long-range maritime reconnaissance, anti-submarine warfare aircraft for the Canadian Forces. Based on the P-3C Orion airframe, but mounts the more advanced electronics suite of the S-3 Viking; 18 built
- CP-140A Arcturus: Three P-3s without ASW equipment for Canadian Aurora crew training and various coastal patrol missions.
- P-7 proposed new-build and improved variant as a P-3 Orion replacement later canceled.
- Orion 21 proposed new-build and improved variant as a P-3 Orion replacement; lost to the Boeing P-8 Poseidon.
Muhamaad Bin Qasim
Posted by altaf
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Muhamaad Bin Qasim
Muhammad bin Qasim was orphaned as a child and thus the responsibility of his upbringing fell upon his mother. She supervised his religious instruction herself, and hired different teachers for his worldly education. It was the uncle, Hajjaj bin Yousaf, who taught him the art of governing and warfare.
Qasim was an intelligent and cultured young man who at the age of fifteen was considered by many to be one of his uncle's greatest assets. As a show of faith in his nephew's abilities, Hajjaj married his daughter to Qasim. At the age of sixteen, he was asked to serve under the great general, Qutayba bin Muslim. Under his command Muhammad bin Qasim displayed a talent for skilful fighting and military planning. Hajjaj's complete trust in Qasim's abilities as a general became even more apparent when he appointed the young man as the commander of the all-important invasion on Sindh, when he was only seventeen years old. Muhammad bin Qasim proved Hajjaj right when he, without many problems, managed to win all his military campaigns. He used both his mind and military skills in capturing places like Daibul, Raor, Uch and Multan. History does not boast of many other commanders who managed such a great victory at such a young age.
Besides being a great general, Muhammad bin Qasim was also an excellent administrator. He established peace and order as well as a good administrative structure in the areas he conquered. He was a kind hearted and religious person. He had great respect for other religions. Hindu and Buddhist spiritual leaders were given stipends during his rule. The poor people of the land were greatly impressed by his policies and a number of them embraced Islam. Those who stuck to their old religions erected statues in his honor and started worshiping him after his departure from their land.
Muhammad bin Qasim was known for his obedience to the ruler. Walid bin Abdul Malik died and was succeeded by his younger brother Suleman as the Caliph. Suleman was an enemy of Hajjaj and thus ordered Qasim back to the kingdom. Qasim knew of the animosity between the two. He was aware that due to this enmity, he would not be well treated. He could have easily refused to obey the Caliph's orders and declare his independence in Sindh. Yet he was of the view that obeying ones ruler is the duty of a general and thus he decided to go back to the center. Here he became a victim to party politics. He was put behind bars where he died at age of twenty. Many historians believe that had he been given a few more years, he would have conquered the entire South Asian region.
GUESS PAPER IX-Urdu
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عمومی ہدایات حصہ الف ۱۵ کثیر الاانتخابی سوالات پر مشتمل ہے اور ان میں ہر جز کا جواب درکار ہے۔ حصہ ب مختصر جوابات کے سوالات پر مشتمل ہے اور اس حصے کے تمام سوالات کے جوابات مطلوب ہیں۔ حصہ ج تفصیلی جوابات کے سوالات پر مشتمل ہے اور اس حصے سے تمام سوالات کرنے ہیں۔
(حصہ الف لازمی(کثیر الاانتخابی سوالات سوال نمبر الف مندرجہ ذیل میں سے ہر ایک کے لیے درست جواب منتخب کیجیے۔ ۔ افسانہ سونے کا ہار کے مصنف کا نام کیا ہے؟i ڈپٹی نذیر احمد غبدالحلیم شرر احمد ندیم قاسمی غلام عباس
۔ مولانا صلاح الدین احمد کون سا رسالہ شایع کرتے تھے؟ii ادبی دنیا فنون محشر ان میں سے کوءی نہیں
۔ جاڑے کی چاندنی اور آنندی کس کے افسانوں کے مجموعے ہیں؟iii علی عباس حسینی مرزا فرحت اللہ بیگ غلام عباس ڈپٹی نذیر احمد
۔ جب جوہر ٹوٹتے یا شق ہوجاتے ہیں تو سد عمل کو کیا کہتے ہیںiv انشقاق احتراق گداخت ان میں سے کوءی نہیں
۔ ڈپٹی نذیر احمد کی کہانی اور پھول والوں کی سیر سے کس شخصیت کا خیال آتا ہے؟v عظیم بیگ چغتاءی فرحت اللہ بیگ ڈپٹی نذیر احمد امیر منیاءی
۔ ایمسٹرڈم میں کس چیز کا جال ہے؟vi نہروں کا سڑکوں کا پلوں کا سمندروں کا
۔ اردو کا پہلا ناول نگار کس کو سمجھا جاتا ہے؟vii عبدالحلیم شرر الطاف حسین حالی ڈپٹی نذیر احمد مولانا صلاح الدین احمد
۔ سر سید احمد خان کی سوانح عمری حیات جاوید کے خالق کون ہیں؟viii الطاف حسین حالی سر سید احمد خان شبلی نعمانی مرزا فرحت اللہ بیگ
۔ اردو ادب میں تاریخی ناول نگاری کے بانی کون ہیں؟ix عبد الحمید سالک علی عباس حسینی عبد الحلیم شرر مرزا عظیم بیگ چغتاءی
۔ مشہور سفر نامے چلتے ہو تو چین کو چلیے اور ابن بطوطہ کے تعاقب میں کے مصنف کون ہیں؟x امیر میناءی ابن انشاء غلام عباس ان میں سے کوءی نہیں
مندرجہ ذیل صحیح جواب کا انتخاب کرکے لکھیے
اردو کے اہم ترین صوفی شاعر سمجھے جاتے ہیں۔___________ میر تقی میر علامہ اقبال خواجہ میر درد مرزا غالب
اردو میں شاعر مزدور کے لقب سے مشہور ہیں۔__________ اکبر الہ آبادی احسان دانش میر انیس ساقی جاوید
اس نطم کو کہتے ہیں جس میں کسی کی موت یا قومی سانحے پر افسوس کا اظہار کیا گیا ہو________ مرثیہ غزل رباعی ان میں سے کوءی نہیں
بانگ، بال جبریل اور ضرب کلیم کے حوالے سے ___________تصور ذہن میں آتا ہے؟ اسد اللہ خان غالب علامہ اقبال حسرت موہانی خواجہ الطاف حسین حالی
غزل کا آخری شعر ___________کہلاتا ہے ردیف مقطع مطلع ان میں سے کوءی نہیں
حصہ ب مختصر جواب کے سوالات مندرجہ ذیل میں سے دو سوالات کے جوابات تحریر کیجیے نبی بخش کی اتنی قدر کیوں کی جاتی تھی بیرونی مسرتوں اور مصنوعی خوشیوں کے پیچھے کون لوگ بھاگتے ہیں؟ انجمن حمایت الاسلام کے جلسے میں مولوی نذیر احمد نے کس طرح چندہ کیا؟ جوہر توڑ آلہ کس طرح کام کرتا ہے؟ سوال نمبر ۳۔ سب نبی بخش کا خلاصہ یا سبق اوورکوٹ کا مرکزی خیال تحریر کیجیے۔ سوال نمبر ۴۔ نطم چاند میری زمین کا خلاصہ یا نظم عقل و دل کا مرکزی خیال تحریر کیجیے۔ سوال نمبر ۵۔ مندرجہ ذیل میں سے تین سوالات کے جوابات ادبی شخصیات کے حوالے سے تحریر کیجیے۔ مولانا صلاح الدین احمد کے مضامین کے مجموعے کا نام کیا ہے اور ان کی نثر کسی ہوتی تھی؟ مولانا عبد الحلیم شرر اردو ادب میں کن حیثیتوں سے مشہور ہیں ان کے تین ناولوں کے نام لکھیے۔ میر تقی میر کس لقب سے مشہور ہیں؟ ان کی شاعری کی بنیادی صفات دو جملوں میں تحریر کیجیے۔ حال نے غزل کے روایتی انداز کس طرح بدلنے کی کوشش کی؟ غالب کی شاعری میں کون سی بات نمایاں ہے اور ان کی شاعری پر کس زبان کا اثر ہے؟ سوال نمبر ۲الف۔ بناوٹ کے لحاظ سے اسم کی اقسام مثالوں کے ساتھ تحریر کیجیے۔ یا روز مرہ اور محاورے کی تعریف مثالوں کے ساتھ تحریر کیجیے۔ ب مندرجہ ذیل میں سے پانچ الفاظ اور محاورات کے جملے بنایے۔ میدان کارزار خراماں خراماں ہدف بننا تاب لانا چمنِ آرزو توانایی جذبہ ترحم ج مندرجہ ذیل الفاظ کے متضاد لکھیے اہلکار مصنوعی ضعیف زاہد مشترک
حصہ ج تفصیلی جواب کے سوالات سوال نمبر ۷ کسی اخبار کے مدیر کے نام ایک مراسلہ لکھیے جس میں ماحولیاتی آلودگی کے خاتمے کے لیے تجاویز پیش کیجیے۔ یا اپنے دوست کو خط لکھیے جس میں ایک دینی ملی فریضے کی حیثیت سے خدمت خلق کی اہمیت پیان کیجیے۔
سوال نمبر ۸ مندرجہ ذیل میں سے کسی ایک عبارت کا مطلب آسان اردو میں تحریر کیجیے سبق کا نام مع حوالہ مصنف تحریر کیجیے۔
دانا اور احمق صبر دونوں کرتے ہیں مگر فرق اتنا ہوتا ہے کہ احمق رودھوک چپ کرتا ہے اور دانا شروع سے خدا پر نظر کرکے چپ ہو رہتا ہے۔ غرض صبر تو آخر کرنا پڑے گا پس کیا فاءدہ کہ اپنا ثواب ضایع کریں۔ دل کو مضبوط کر۔ آنسو پونچھو، سنبھل بھیٹو، خدا ہمارا مالک ہے اس نے دیا، اس نے لیا۔ خدا ہم کو ہم سے عداوت نہیں، بیر نہیں۔ جو کچھ کرتا ہے ہمارے نفع کے لیے کرتا ہے۔ لیکن اپنی کم فہمی کی وجہ سے ہم ان مصلحتوں کے سمجھنے سے قاصر ہیں۔ یا انسانی دل دھڑکتا نہیں، ہر لمحہ نءے ارادے تخلیق کرتا ہے، کءی ارادے پیدا ہوتے ہی رد کردیے جاتے ہیں اور کءی اتنے بڑے ہوجاتے ہیں کہ دل کی محدود چاردیواری میں نہیں سما سکتے کسی نہ کسی طریقے سے باہر نکل پڑنے کے لیے بیتاب ہوجاتے ہیں اور اگر یہ ارادے بھی آخر کا ر رد ہوجاءیں تو دل اس ساغر کی طرح بے رونق ہوجاتا ہے۔ جس میں سے شراب انڈیل لی گءی ہو۔
سوال نمبر ۹ شعراء کے حوالے کے ساتھ مندرجہ ذیل میں سے کسی جز کی تشریح کیجیے۔ رگوں میں دوڑ نے پھرنے کے ہم نہیں قاءل ٗ جب آنکھ ہی سے نہ ٹپکا تو پھر لہو کیا ہے من کی دنیا، من کی دنیا، سوز و مستی و شوق؎ تن کی دنیا، تن کی دنیا، سود و سودا مکر و فن نتیجے ہم نے خود آنکھوں سے دیکھے روزِ روشن میں ؔ فلک نے سرکشوں کو خاکِ ناکامی پہ دے مار یا ہو علم اگر نصیب تعلیم بھی کر ؔ دولت جو ملے تو اس کو تقسیم بھی کر اللہ کرے عطا جو عظمت تجھ کو ؔ فو اہل ہیں اس کے ان کی تعظیم بھی کر
سوال نمبر ۱۰ مندرجہ ذیل میں سے کسی ایک عنوان پر مضمون لکھیے ۔ ایک ہوں مسلم حرم کی پاسبانی کے لیےi ۔ اپنی مدد آپii ۔ کتب خانوں کی اہمیت و افادیت