Qualification > Math
IGCSE MATHS Doubts
Shazizzzle:
--- Quote from: the golden girl on May 13, 2010, 11:32:16 am ---
read the previous replies and u'll kno ....but By the way ur answer is right but what equations did u use ..in other words , how did solve it ? .... i got it 18smthn which is wrong -_-
--- End quote ---
First of all, you had to calculate the distance traveled by Alonso, i.e area under the graph. Which was 130m.
As they both traveled the same distance, and in the same time too, the area under the graph of boris's graph should also be 130 m.
It was a traingle, so area = 1/2 X b X h
130 = 1/2 X 16 X v (height was v, the maximum speed)
v=16.25 m/s
OR.
Using Alonso's distance and time, you could find the average speed, 130/16 = 8.125 m/s.
Then, using the formula, (physics) (initial speed + final speed)/2 = avg. speed, you could find the final speed, i.e v m/s, using 0 m/s as the initial as he started from rest.
Both techniques are correct.
Dibss:
--- Quote from: Ari Ben Canaan on May 13, 2010, 11:38:43 am ---Take it from me; the order of rotational symmetry was ZERO
--- End quote ---
the David Rayner textbook endorsed by CIE has an example stating that a semi-circle has rotational symmetry of order 1.
order one is the same as zero!
The Golden Girl =D:
--- Quote from: Shazizzzle on May 13, 2010, 11:40:04 am ---First of all, you had to calculate the distance traveled by Alonso, i.e area under the graph. Which was 130m.
As they both traveled the same distance, and in the same time too, the area under the graph of boris's graph should also be 130 m.
It was a traingle, so area = 1/2 X b X h
130 = 1/2 X 16 X v (height was v, the maximum speed)
v=16.25 m/s
OR.
Using Alonso's distance and time, you could find the average speed, 130/16 = 8.125 m/s.
Then, using the formula, (physics) (initial speed + final speed)/2 = avg. speed, you could find the final speed, i.e v m/s, using 0 m/s as the initial as he started from rest.
Both techniques are correct.
--- End quote ---
this is the only part i did okay ...then i added 10 to it for no reason ..idk...but atleast the examiner might give me half the mark ..anyways thx alot mate :D
aaliya_5:
I hated the paper.
It was 387638956395 times harder than the past papers and I royally messed up :(
Guess I have no other choice but to work my butt off for paper 4 :/
Shazizzzle:
--- Quote from: aaliya_5 on May 13, 2010, 11:55:39 am ---I hated the paper.
It was 387638956395 times harder than the past papers and I royally messed up :(
Guess I have no other choice but to work my butt off for paper 4 :/
--- End quote ---
Good Luck! :)
Don't worry, Paper 4 will be easier!
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