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Wiskunde

Graad 9

Getalpatrone

Grafiese voorstellings

Vergelykings

Statistiek

Waarskynlikheidsleer

Module 13

‘n studie van grafieke

Wat is grafieke nou eintlik?

Aktiwiteit 1

Om sekere grafieke te bestudeer om hulle te kan verstaan

[lu 1.3, 5.5]

Grafiek A wys hoe die getal TV-stelle per 1 000 mense verander het tussen 1985 en 1995 in ses verskillende streke van die wêreld. Byvoorbeeld, in 1985 het Suid-Asië 20 TV-stelle per 1 000 mense gehad; in 1995 was daar 55 TV-stelle per 1 000 mense.

Grafiek B wys, op die vertikale as, die getal persone in die tronk in die Ver­enigde State van Amerika gedurende die jare aangetoon op die horisontale as. Byvoorbeeld, daar was 135 000 mense in die tronk in 1940.

  • Werk saam in pare; een werk met grafiek A om vraag 1 te beantwoord, en die ander een met grafiek B en vraag 2. Gee redes of verduidelikings vir alle bewerings.

1 Bestudeer grafiek A , en skryf dan antwoorde en verduidelikings neer vir hierdie vrae:

1.1 Watter streek het die laagste getal TV-stelle per 1 000 in 1985 gehad?

1.2 Watter streek het die hoogste getal TV-stelle per 1 000 in 1995 gehad?

1.3 In watter streek het die getal TV-stelle per 1 000 die meeste gestyg?

1.4 Is daar ’n streek waar die getal TV-stelle per 1 000 minder geword het?

1.5 Vergelyk Afrika Suid van die Sahara met die Arabiese State en lewer kommentaar op die verandering in TV-stel-getalle.

1.6 Gebruik nou jou verbeelding – hoe sou die situasie wees? – en trek ’n soortgely­ke grafiek wat twee ander streke wys: Suid-Afrika en die Verenigde State van Amerika.

2 Bestudeer grafiek B en beantwoord hierdie vrae:

2.1 Vanuit die grafiek, probeer skat hoeveel mense in die tronk was in:

a) 1930 b) 1950 c) 1995

2.2 Was daar in 1980 meer of minder as 200 000 mense in die tronk?

2.3 Die grafiek gaan afwaarts net ná 1940. Wat kan jy daaruit aflei?

2.4 Skryf neer rofweg hoeveel jaar dit geneem het vir die tronkbevolking om te verdubbel van wat dit in 1950 was.

2.5 Hoe lank het die tronkbevolking geneem om te verdubbel van wat dit in 1985 was?

2.6 Sou jy sê dat die getal mense in die tronk in die VSA pal styg? Gee redes.

2.7 As ’n mens die grafiek se boodskap lees, hoe meen jy sal die tronkbevolking van die VSA in die toekoms daar uitsien?

3 In Aardrykskunde tref ’n mens ’n interessante soort grafiek aan – ’n deursnee-tekening. Hier sien ’n mens hoe die hoogte bo seespieël varieer tussen twee plekke. Die een hieronder is vir die reguit lyn tussen Bottelaryberg en Papegaaiberg, twee heuwels naby Stellenbosch. Al die mates is in meter. Hieruit kan ons sien dat Bottelaryberg (links) ongeveer 470 m bo seespieël is, en Papegaaiberg ongeveer 255 m. As jy vanaf Bottelaryberg in ’n reguit lyn loop, kry jy ná ongeveer 2,5 km ’n holtetjie, en dan, oor nog ’n halwe kilometer, loop jy oor ’n klein heuweltjie.

  • So ’n grafiek is van besondere waarde vir padmakers aangesien dit die skuinsste van die terrein aantoon.
  • Dit is baie duidelik dat vanaf Bottelaryberg die hoogte sterk val oor ongeveer 750 m. Maar as jy van die kruin van Papegaaiberg af in die rigting van Bottelaryberg stap, neem dit die hoogte omtrent 1,5 km om net so ver te val, wat die roete heelwat minder steil maak.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Wiskunde graad 9. OpenStax CNX. Sep 14, 2009 Download for free at http://cnx.org/content/col11055/1.1
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