Maths & Physics Help

[toobeerajpanchoo]

HEY | am | I WANNA KNOW HOW U DO TO CALCULATE AREA UNDER GRAPH ALL ITS FORMULAS

[Ghost Of Highbury]

HEY | am | I WANNA KNOW HOW U DO TO CALCULATE AREA UNDER GRAPH ALL ITS FORMULAS

if its a speed-time graph...the area under the graph would be the distance covered.

Theres no formula to find it, u have to first identify the shape. It can be a trapezium/square/triangle anything..

find a sample graph below and i have shown how u calculate the area under the graph..

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first identify the shape - trapezium

area of trapezium = 0.5 * (sum of parallel sides) * perpendicuar height = 0.5 * (7+10) * 25 = 212.5cm²

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u can also use integration to find the area.

[toobeerajpanchoo]

ALRIGHT I UNDERSTOOD BUT COULD EXPLAIN HOW TO DO THE QUESTIONS IN JUNE 2008 CIE ABOUT KINEMATICS PAPER 1

[astarmathsandphysics]

which question?

[toobeerajpanchoo]

NO 13
13 The diagram is the speed-time graph of the first 20 seconds of a motorcyclist’s journey.
Speed
(a) Calculate the motorcyclist’s retardation during the final 8 seconds.
(b) Calculate the distance travelled in the 20 seconds.

[astarmathsandphysics]

Will answer when i get home

[Ghost Of Highbury]

NO 13
13 The diagram is the speed-time graph of the first 20 seconds of a motorcyclist’s journey.
Speed
(a) Calculate the motorcyclist’s retardation during the final 8 seconds.
(b) Calculate the distance travelled in the 20 seconds.

use the formula

v = u+at

s=ut + 0.5at²

[toobeerajpanchoo]

ALRIGHT 

[astarmathsandphysics]

a)The final 8 seconds is a triangle base 8 height 30
area= 0.5bh=0.5*8*30=120m
b) cut up the first 12s into a triangle base 8 and height 15 so area =0.5*8*15=60
and trpezium a=15 b=30 h=4
0.5(a+b)h =0.5*(15+30)4=90
total area =60+90+120=270m

[sasukeuchiha]

please give me the answer of o levels physics October/November 2008 mcq paper 1 question no. 23
please give an explanation too
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=TyBMZXZlbC9QaHlzaWNzL0NJRS8yMDA4IE5vdi81MDU0X3cwOF9xcF8xLnBkZg==

[DrEvil]

please give me the answer of o levels physics October/November 2008 mcq paper 1 question no. 23
please give an explanation too
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=TyBMZXZlbC9QaHlzaWNzL0NJRS8yMDA4IE5vdi81MDU0X3cwOF9xcF8xLnBkZg==

The answer is C. Extend the rays beyond the mirror that are entering the eye and you'll get the explanation.

[sasukeuchiha]

many thanks ..that was a concept left to be cleared

[DrEvil]

many thanks ..that was a concept left to be cleared

my pleasure..