Het nie nodig gehad om vinnig te kon hardloop nie.
Korter bene was voldoende om in woude te kon oorleef.
Word vandag in oop vlaktes aangetref.
Moet vinnig kan hardloop vir vyand.
Langer, meer gespierde bene help om te oorleef.
Word gebruik om op te ry en karre te trek.Het groter en sterker geword sodat dit ‘n effektiewe vervoermiddel kon word.
Leerder afdeling
Inhoud
Aktiwiteit: om die verandering van organismes met die verloop van tyd te kan bespreek [lu 2.3]
Plante en diere verander gedurig om aan te pas en beter in hul omgewings te kan oorleef. Die omgewing verander egter ook. Dit is waarom die dierelewe oor die eeue heen verander het.
Gedurende die tydperk van die dinosourusse was die wêreld meestal warm en droog. Geleidelik het die klimaat begin verander, nuwe diere en plante het begin ontwikkel en ander het uitgesterf. Soos die klimaat warmer en natter geword het, het groot woude van reuse varings en allerlei keëldraende bome ontstaan. In hierdie veranderende wêreld moes die dinosourusse ook verander om te kon oorlewe. Omtrent 100 miljoen jaar gelede het daar blomplante en bloeiselbome verskyn en stadigaan het daar woude van lourier- en eikebome begin groei. Voëls, insekte en ander diere het begin ontwikkel om die nektar en stuifmeel van die blomme te vreet.
Die dinosourusse het almal verdwyn, maar hulle het afstammelinge nagelaat. Indien fossiele bestudeer word, blyk dit dat krokodille en voëls die naaste lewende familie van die dinosourusse is. Die dinosourusse was wel reptiele, maar die reptiele het reeds 300 miljoen jaar gelede ontwikkel. Reeds voor die dinosourusse verskyn het, het die reptiele al in talle verskillende groepe vertak.
Verandering van organismes:
Sommige diere, soos bv. die kakkerlak, het oor miljoene jare byna niks verander nie. Om te oorleef moes ander diere egter aanpas en het hulle met verloop van tyd drasties verander. Perde was eens so groot soos ‘n terriër en het in woude gebly. Vandag is hulle vinnige langbeendiere wat op oop vlaktes bly. Dit staan bekend as natuurlike seleksie.
Prehistoriese Lewe, Van den Heever et al., p. 19
OPDRAG 9
Bespreek die rede vir bogenoemde aanpassings by perde eers in julle groepe. Skryf dan ‘n paragraaf waarin jy ten minste vyf moontlike redes verskaf vir hierdie verandering.
Leeruitkomste 2: Die leerder ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.
Assesseringstandaard 2.3:Dis duidelik wanneer die leerder inligting interpreteer.
Questions & Answers
Three charges q_{1}=+3\mu C, q_{2}=+6\mu C and q_{3}=+8\mu C are located at (2,0)m (0,0)m and (0,3) coordinates respectively. Find the magnitude and direction acted upon q_{2} by the two other charges.Draw the correct graphical illustration of the problem above showing the direction of all forces.
To solve this problem, we need to first find the net force acting on charge q_{2}. The magnitude of the force exerted by q_{1} on q_{2} is given by F=\frac{kq_{1}q_{2}}{r^{2}} where k is the Coulomb constant, q_{1} and q_{2} are the charges of the particles, and r is the distance between them.
Muhammed
What is the direction and net electric force on q_{1}= 5µC located at (0,4)r due to charges q_{2}=7mu located at (0,0)m and q_{3}=3\mu C located at (4,0)m?
Capacitor is a separation of opposite charges using an insulator of very small dimension between them. Capacitor is used for allowing an AC (alternating current) to pass while a DC (direct current) is blocked.
Gautam
A motor travelling at 72km/m on sighting a stop sign applying the breaks such that under constant deaccelerate in the meters of 50 metres what is the magnitude of the accelerate
velocity can be 72 km/h in question. 72 km/h=20 m/s, v^2=2.a.x , 20^2=2.a.50, a=4 m/s^2.
Mehmet
A boat travels due east at a speed of 40meter per seconds across a river flowing due south at 30meter per seconds. what is the resultant speed of the boat
which has a higher temperature, 1cup of boiling water or 1teapot of boiling water which can transfer more heat 1cup of boiling water or 1 teapot of boiling water explain your . answer
I believe temperature being an intensive property does not change for any amount of boiling water whereas heat being an extensive property changes with amount/size of the system.
Someone
Scratch that
Someone
temperature for any amount of water to boil at ntp is 100⁰C (it is a state function and and intensive property) and it depends both will give same amount of heat because the surface available for heat transfer is greater in case of the kettle as well as the heat stored in it but if you talk.....
Someone
about the amount of heat stored in the system then in that case since the mass of water in the kettle is greater so more energy is required to raise the temperature b/c more molecules of water are present in the kettle
pratica A on solution of hydro chloric acid,B is a solution containing 0.5000 mole ofsodium chlorid per dm³,put A in the burret and titrate 20.00 or 25.00cm³ portion of B using melting orange as the indicator. record the deside of your burret tabulate the burret reading and calculate the average volume of acid used?
No. According to Isac Newtons law. this two bodies maybe you and the wall beside you.
Attracting depends on the mass och each body and distance between them.
Dlovan
Are you really asking if two bodies have to be charged to be influenced by Coulombs Law?
Specific heat capacity is a measure of the amount of energy required to raise the temperature of a substance by one degree Celsius (or Kelvin). It is measured in Joules per kilogram per degree Celsius (J/kg°C).
AI-Robot
specific heat capacity is the amount of energy needed to raise the temperature of a substance by one degree Celsius or kelvin
ROKEEB
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