This document provides an overview of biophysics and various physics concepts relevant to measurements and units, coordinate systems, vectors, and other foundational topics. It discusses standardized measurement systems, dimensional analysis, vector notation and properties, and methods for adding and subtracting vectors graphically and algebraically. The purpose is to introduce basic physics concepts and mathematical tools used in biophysics.
First law of thermodynamics as taught in introductory physical chemistry (includes general chemistry material). Covers concepts such as internal energy, heat, work, heat capacity, enthalpy, bomb calorimetry, Hess's law, thermochemical equations, bond energy, and heat of formations.
First law of thermodynamics as taught in introductory physical chemistry (includes general chemistry material). Covers concepts such as internal energy, heat, work, heat capacity, enthalpy, bomb calorimetry, Hess's law, thermochemical equations, bond energy, and heat of formations.
Presented at Michigan State University's WorldTAP International Short Course in Food Safety on July 31, 2009. (http://foodsafetyknowledgenetwork.org/worldtap/foodsafety09)
Avionics 738 Adaptive Filtering at Air University PAC Campus by Dr. Bilal A. Siddiqui in Spring 2018. This lecture covers background material for the course.
This first lecture describes what EMT is. Its history of evolution. Main personalities how discovered theories relating to this theory. Applications of EMT . Scalars and vectors and there algebra. Coordinate systems. Field, Coulombs law and electric field intensity.volume charge distribution, electric flux density, gauss's law and divergence
Presented at Michigan State University's WorldTAP International Short Course in Food Safety on July 31, 2009. (http://foodsafetyknowledgenetwork.org/worldtap/foodsafety09)
Avionics 738 Adaptive Filtering at Air University PAC Campus by Dr. Bilal A. Siddiqui in Spring 2018. This lecture covers background material for the course.
This first lecture describes what EMT is. Its history of evolution. Main personalities how discovered theories relating to this theory. Applications of EMT . Scalars and vectors and there algebra. Coordinate systems. Field, Coulombs law and electric field intensity.volume charge distribution, electric flux density, gauss's law and divergence
NANO106 is UCSD Department of NanoEngineering's core course on crystallography of materials taught by Prof Shyue Ping Ong. For more information, visit the course wiki at http://nano106.wikispaces.com.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
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Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
1. A Rapid trip Through Physics ToA Rapid trip Through Physics To
BiophysicsBiophysics
Umed Aruzery (PhDc)
2016-2017
Biophysics
2. 1. Measurements1. Measurements
Measurement is :Measurement is :
►Basis ofBasis of testingtesting theories in sciencetheories in science
►Need to have consistentNeed to have consistent systems of unitssystems of units forfor
the measurementsthe measurements
►UncertaintiesUncertainties are inherentare inherent
►NeedNeed rules for dealing with the uncertaintiesrules for dealing with the uncertainties
3. Systems of MeasurementSystems of Measurement
►Standardized systemsStandardized systems
agreed upon by some authority, usually aagreed upon by some authority, usually a
governmental bodygovernmental body
►SI -- SystSI -- Systééme Internationalme International
agreed to in 1960 by an international committeeagreed to in 1960 by an international committee
main system used in this coursemain system used in this course
also calledalso called mksmks for the first letters in the units offor the first letters in the units of
the fundamental quantitiesthe fundamental quantities
4. Systems of MeasurementsSystems of Measurements
►cgscgs -- Gaussian system-- Gaussian system
named for the first letters of the units it uses fornamed for the first letters of the units it uses for
fundamental quantitiesfundamental quantities
►US CustomaryUS Customary
everyday units (ft, mile, etc.)everyday units (ft, mile, etc.)
often uses weight, in pounds, instead of massoften uses weight, in pounds, instead of mass
as a fundamental quantityas a fundamental quantity
5. Basic Quantities and Their DimensionBasic Quantities and Their Dimension
►Length [L]Length [L]
►Mass [M]Mass [M]
►Time [T]Time [T]
Why do we need standards?
6. LengthLength
►UnitsUnits
SI -- meter, mSI -- meter, m
cgs -- centimeter, cmcgs -- centimeter, cm
US Customary -- foot, ftUS Customary -- foot, ft
►Defined in terms of a meter -- the distanceDefined in terms of a meter -- the distance
traveled by light in a vacuum during a giventraveled by light in a vacuum during a given
time (1/299 792 458 s)time (1/299 792 458 s)
7. MassMass
►UnitsUnits
SI -- kilogram, kgSI -- kilogram, kg
cgs -- gram, gcgs -- gram, g
USC -- slug, slugUSC -- slug, slug
►Defined in terms of kilogram, based on aDefined in terms of kilogram, based on a
specific Pt-Ir cylinder kept at thespecific Pt-Ir cylinder kept at the
International Bureau of StandardsInternational Bureau of Standards
9. TimeTime
►UnitsUnits
seconds, sseconds, s in all three systemsin all three systems
►Defined in terms of the oscillation ofDefined in terms of the oscillation of
radiation from a cesium atomradiation from a cesium atom
(9 192 631 700 times frequency of light emitted)(9 192 631 700 times frequency of light emitted)
12. 2. Dimensional Analysis2. Dimensional Analysis
► DimensionDimension denotes thedenotes the physical naturephysical nature of aof a
quantityquantity
► Technique toTechnique to check the correctnesscheck the correctness of anof an
equationequation
► Dimensions (length, mass, time, combinations)Dimensions (length, mass, time, combinations)
can be treated as algebraic quantitiescan be treated as algebraic quantities
add, subtract, multiply, divideadd, subtract, multiply, divide
quantities added/subtracted only if have same unitsquantities added/subtracted only if have same units
► Both sides of equation must have the sameBoth sides of equation must have the same
dimensionsdimensions
13. Dimensional AnalysisDimensional Analysis
► Dimensions for commonly used quantitiesDimensions for commonly used quantities
Length L m (SI)
Area L2
m2
(SI)
Volume L3
m3
(SI)
Velocity (speed) L/T m/s (SI)
Acceleration L/T2
m/s2
(SI)
Example of dimensional analysisExample of dimensional analysis
distance = velocity · time
L = (L/T) · T
14. 3. Conversions3. Conversions
►WhenWhen units are not consistentunits are not consistent, you may, you may
need toneed to convertconvert to appropriate onesto appropriate ones
►Units can be treated like algebraicUnits can be treated like algebraic
quantities that canquantities that can cancel each other outcancel each other out
1 mile = 1609 m = 1.609 km 1 ft = 0.3048 m = 30.48 cm
1m = 39.37 in = 3.281 ft 1 in = 0.0254 m = 2.54 cm
15. Example 1Example 1. Scotch tape:. Scotch tape:
Example 2Example 2. Trip to Canada:. Trip to Canada:
Legal freeway speed limit in Canada is 100 km/h.
What is it in miles/h?
h
miles
km
mile
h
km
h
km
62
609.1
1
100100 ≈⋅=
16. PrefixesPrefixes
►Prefixes correspond to powers of 10Prefixes correspond to powers of 10
►Each prefix has a specificEach prefix has a specific
name/abbreviationname/abbreviation
Power Prefix Abbrev.
1015
peta P
109
giga G
106
mega M
103
kilo k
10-2
centi P
10-3
milli m
10-6
micro µ
10-9
nano n
Distance from Earth to nearest star 40 Pm
Mean radius of Earth 6 Mm
Length of a housefly 5 mm
Size of living cells 10 µm
Size of an atom 0.1 nm
17. Example: An aspirin tablet contains 325 mg of acetylsalicylic acid.
Express this mass in grams.
Solution:
3
325 325 10 0.325m mg g g−
= = × =
Given:
m = 325 mg
Find:
m (grams)=?
Recall that prefix “milli” implies 10-3
, so
18. Math Review:Math Review: Coordinate SystemsCoordinate Systems
►Used to describe the position of a point inUsed to describe the position of a point in
spacespace
►Coordinate system (frame)Coordinate system (frame) consists ofconsists of
a fixed reference point called thea fixed reference point called the originorigin
specificspecific axes with scales and labelsaxes with scales and labels
instructions on how to label a pointinstructions on how to label a point relative torelative to
the origin and the axesthe origin and the axes
19. Types of Coordinate SystemsTypes of Coordinate Systems
►CartesianCartesian
►Plane polarPlane polar
20. Cartesian coordinate systemCartesian coordinate system
► also called rectangularalso called rectangular
coordinate systemcoordinate system
► x- and y- axesx- and y- axes
► points are labeled (x,y)points are labeled (x,y)
21. Plane polar coordinate systemPlane polar coordinate system
origin and referenceorigin and reference
line are notedline are noted
point is distance r frompoint is distance r from
the origin in thethe origin in the
direction of angledirection of angle θθ, ccw, ccw
from reference linefrom reference line
points are labeled (r,points are labeled (r,θθ))
22. Math Review:Math Review: TrigonometryTrigonometry
sin
sideadjacent
sideopposite
hypotenuse
sideadjacent
hypotenuse
sideopposite
=
=
=
θ
θ
θ
tan
cos
sin
PythagoreanPythagorean
TheoremTheorem 222
bac +=
23. Example: how high is the building?Example: how high is the building?
Slide 13
Fig. 1.7, p.14
Known: angle and one side
Find: another side
Key: tangent is defined via two
sides!
mmdistheight
dist
buildingofheight
3.37)0.46)(0.39(tantan.
,
.
tan
==×=
=
α
α
α
24. Math Review:Math Review: Scalar and VectorScalar and Vector
QuantitiesQuantities
► ScalarScalar quantities are completely described byquantities are completely described by
magnitude only (magnitude only (temperature, lengthtemperature, length,…),…)
► VectorVector quantities need both magnitude (size) andquantities need both magnitude (size) and
direction to completely describe themdirection to completely describe them
((force, displacement, velocityforce, displacement, velocity,…),…)
Represented by an arrow, theRepresented by an arrow, the lengthlength of the arrowof the arrow isis
proportional to the magnitudeproportional to the magnitude of the vectorof the vector
Head of the arrow represents the directionHead of the arrow represents the direction
25. Vector NotationVector Notation
►WhenWhen handwrittenhandwritten, use an arrow:, use an arrow:
►WhenWhen printedprinted, will be in bold print:, will be in bold print: AA
►When dealing with just the magnitude of aWhen dealing with just the magnitude of a
vector in print, an italic letter will be used:vector in print, an italic letter will be used: AA
A
26. Properties of VectorsProperties of Vectors
►Equality of Two VectorsEquality of Two Vectors
Two vectors areTwo vectors are equalequal if they have theif they have the samesame
magnitudemagnitude and theand the same directionsame direction
►Movement of vectors in a diagramMovement of vectors in a diagram
Any vector can be movedAny vector can be moved parallel to itselfparallel to itself
without being affectedwithout being affected
27. More Properties of VectorsMore Properties of Vectors
►Negative VectorsNegative Vectors
Two vectors areTwo vectors are negativenegative if they have theif they have the
same magnitude but are 180° apart (oppositesame magnitude but are 180° apart (opposite
directions)directions)
► AA = -= -BB
►Resultant VectorResultant Vector
TheThe resultantresultant vector is the sum of a given setvector is the sum of a given set
of vectorsof vectors
28. Adding VectorsAdding Vectors
►When adding vectors,When adding vectors, their directions musttheir directions must
be taken into accountbe taken into account
►Units must be the sameUnits must be the same
►Graphical MethodsGraphical Methods
Use scale drawingsUse scale drawings
►Algebraic MethodsAlgebraic Methods
More convenientMore convenient
29. Adding Vectors GraphicallyAdding Vectors Graphically
(Triangle or Polygon Method)(Triangle or Polygon Method)
► Choose a scaleChoose a scale
► Draw the first vector with the appropriate lengthDraw the first vector with the appropriate length
and in the direction specified, with respect to aand in the direction specified, with respect to a
coordinate systemcoordinate system
► Draw the next vector with the appropriate lengthDraw the next vector with the appropriate length
and in the direction specified, with respect to aand in the direction specified, with respect to a
coordinate system whose origin is the end ofcoordinate system whose origin is the end of
vectorvector AA and parallel to the coordinate systemand parallel to the coordinate system
used forused for AA
30. Graphically Adding VectorsGraphically Adding Vectors
► Continue drawing theContinue drawing the
vectorsvectors “tip-to-tail”“tip-to-tail”
► The resultant is drawnThe resultant is drawn
from the origin offrom the origin of AA to theto the
end of the last vectorend of the last vector
► Measure the length ofMeasure the length of RR
and its angleand its angle
Use the scale factor toUse the scale factor to
convert length to actualconvert length to actual
magnitudemagnitude
31. Graphically Adding VectorsGraphically Adding Vectors
► When you have manyWhen you have many
vectors, just keepvectors, just keep
repeating the processrepeating the process
until all are includeduntil all are included
► The resultant is stillThe resultant is still
drawn from the origindrawn from the origin
of the first vector to theof the first vector to the
end of the last vectorend of the last vector
32. Alternative Graphical MethodAlternative Graphical Method
► When you have only twoWhen you have only two
vectors, you may use thevectors, you may use the
Parallelogram MethodParallelogram Method
► All vectors, including theAll vectors, including the
resultant, are drawn from aresultant, are drawn from a
common origincommon origin
The remaining sides of theThe remaining sides of the
parallelogram are sketchedparallelogram are sketched
to determine the diagonal,to determine the diagonal, RR
33. Notes about Vector AdditionNotes about Vector Addition
► Vectors obey theVectors obey the
Commutative LawCommutative Law
of Additionof Addition
The order in which theThe order in which the
vectors are addedvectors are added
doesndoesn’t affect the result’t affect the result
34. Vector SubtractionVector Subtraction
► Special case of vectorSpecial case of vector
additionaddition
► IfIf AA –– BB, then use, then use AA+(+(--
BB))
► Continue with standardContinue with standard
vector additionvector addition
procedureprocedure
35. Multiplying or Dividing a VectorMultiplying or Dividing a Vector
by a Scalarby a Scalar
► TheThe resultresult of the multiplication or division is aof the multiplication or division is a vectorvector
► TheThe magnitudemagnitude of the vector is multiplied or divided by theof the vector is multiplied or divided by the
scalarscalar
► If the scalar isIf the scalar is positivepositive, the, the directiondirection of the result is theof the result is the
samesame as of the original vectoras of the original vector
► If the scalar isIf the scalar is negativenegative, the, the directiondirection of the result isof the result is
oppositeopposite that of the original vectorthat of the original vector
36. Components of a VectorComponents of a Vector
► AA componentcomponent is ais a
partpart
► It is useful to useIt is useful to use
rectangularrectangular
componentscomponents
These are theThese are the
projections of the vectorprojections of the vector
along the x- and y-axesalong the x- and y-axes
37. Components of a VectorComponents of a Vector
►The x-component of a vector is theThe x-component of a vector is the
projection along the x-axisprojection along the x-axis
►The y-component of a vector is theThe y-component of a vector is the
projection along the y-axisprojection along the y-axis
►Then,Then,
cosxA A θ=
sinyA A θ=
x yA A= +A
ur ur ur
38. More About Components of aMore About Components of a
VectorVector
► The previous equations are validThe previous equations are valid only ifonly if θ isθ is
measured with respect to the x-axismeasured with respect to the x-axis
► The components can be positive or negative andThe components can be positive or negative and
will have the same units as the original vectorwill have the same units as the original vector
► The components are the legs of the right triangleThe components are the legs of the right triangle
whose hypotenuse iswhose hypotenuse is AA
May still have to find θ with respect to the positive x-axisMay still have to find θ with respect to the positive x-axis
x
y12
y
2
x
A
A
tanandAAA −
=θ+=
39. Adding Vectors AlgebraicallyAdding Vectors Algebraically
►Choose a coordinate system and sketch theChoose a coordinate system and sketch the
vectorsvectors
►Find the x- and y-components of all theFind the x- and y-components of all the
vectorsvectors
►Add all the x-componentsAdd all the x-components
This gives RThis gives Rxx::
∑= xx vR
40. Adding Vectors AlgebraicallyAdding Vectors Algebraically
►Add all the y-componentsAdd all the y-components
This gives RThis gives Ryy::
►Use the Pythagorean Theorem to find theUse the Pythagorean Theorem to find the
magnitude of the Resultant:magnitude of the Resultant:
►Use the inverse tangent function to find theUse the inverse tangent function to find the
direction of R:direction of R:
∑= yy vR
2
y
2
x RRR +=
x
y1
R
R
tan−
=θ
41. Problem Solving StrategyProblem Solving Strategy
Slide 13
Fig. 1.7, p.14
Known: angle and one side
Find: another side
Key: tangent is defined via two sides!
mmdistheight
dist
buildingofheight
3.37)0.46)(0.39(tantan.
,
.
tan
==×=
=
α
α
42. Problem Solving StrategyProblem Solving Strategy
►Read the problemRead the problem
identify type of problem, principle involvedidentify type of problem, principle involved
►Draw a diagramDraw a diagram
include appropriate values and coordinateinclude appropriate values and coordinate
systemsystem
some types of problems require very specificsome types of problems require very specific
types of diagramstypes of diagrams
43. Problem Solving cont.Problem Solving cont.
►Visualize the problemVisualize the problem
►Identify informationIdentify information
identify the principle involvedidentify the principle involved
list the data (given information)list the data (given information)
indicate the unknown (what you are looking for)indicate the unknown (what you are looking for)
44. Problem Solving, cont.Problem Solving, cont.
►Choose equation(s)Choose equation(s)
based on the principle, choose an equation orbased on the principle, choose an equation or
set of equations to apply to the problemset of equations to apply to the problem
solve for the unknownsolve for the unknown
►Solve the equation(s)Solve the equation(s)
substitute the data into the equationsubstitute the data into the equation
include unitsinclude units
45. Problem Solving, finalProblem Solving, final
► Evaluate the answerEvaluate the answer
find the numerical resultfind the numerical result
determine the units of the resultdetermine the units of the result
► Check the answerCheck the answer
are the units correct for the quantity being found?are the units correct for the quantity being found?
does the answer seem reasonable?does the answer seem reasonable?
► check order of magnitudecheck order of magnitude
are signs appropriate and meaningful?are signs appropriate and meaningful?