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Author Topic: Maths & Physics Help  (Read 55992 times)

Offline sweetsh

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Re: Maths & Physics Help
« Reply #165 on: April 24, 2009, 09:36:51 pm »
Yes exactly, this point was missing from my post. My biology teacher told me that.
Thanks astar for making us sure
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #166 on: April 25, 2009, 08:11:49 am »
lol my question was something simpler than that.
i got it answered by sum1 else  (and my question was pretty dumb)
:D
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #167 on: April 25, 2009, 12:48:07 pm »
need help
serious topic
not a small question
its about reflection in plane mirror.
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvUGh5c2ljcy9DSUUvMjAwNSBOb3YvMDYyNV93MDVfcXBfNi5wZGY=      (O/N 05 Paper6)
Q4)f)
Explain me, and do we draw reflected ray? (markscheme not helping :( )
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Offline cockyxrocker

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Re: Maths & Physics Help
« Reply #168 on: April 25, 2009, 01:47:43 pm »
Hey do you have notes on light and atomic physics (0625)
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #169 on: April 25, 2009, 02:05:24 pm »
sry i dont!
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Offline twilight

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Re: Maths & Physics Help
« Reply #170 on: April 25, 2009, 02:06:27 pm »
my friend has some notes 4 these topics .. i'll try to get them for u asap.. dont worry ;)
« Last Edit: April 25, 2009, 02:30:49 pm by twilight »
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #171 on: April 25, 2009, 06:02:59 pm »
Quote from: sgvaibhav on April 25, 2009, 12:48:07 pm
need help
serious topic
not a small question
its about reflection in plane mirror.
http://www.freeexampapers.com/FreeExamPapers.com_.php?__lo=SUdDU0UvUGh5c2ljcy9DSUUvMjAwNSBOb3YvMDYyNV93MDVfcXBfNi5wZGY=      (O/N 05 Paper6)
Q4)f)
Explain me, and do we draw reflected ray? (markscheme not helping :( )

Mr. Paul, plz help me in this question.
ok this is for 4 marks, not small ones like b4, my question is there in the quote

Thank You
:D
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #172 on: April 25, 2009, 06:18:42 pm »
You have drawn in the normal. Draw 5com the other side of this normal from th card AB then a line from where the nomal meets MM' to the edge of this card. Or you could use the angle v, tanv=x/y. Measure this angle on the other side of the normal from the incident ray then draw the line. We must get some drawing software in the forum
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #173 on: April 25, 2009, 06:26:25 pm »
im confused, :'(
Or you could use the angle v, tanv=x/y.   ( i did not get this)

and do we draw reflected ray?
i understood till question E
but i cant do part F only.


regarding drawing softwares, currently i am searching a software that can measure pdf files, so i can do these questions without printing itself.
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #174 on: April 25, 2009, 06:45:14 pm »
v is the angle between the incident ray and the normal. I use trigonometry with the right angled triangle formed by the incident ray, the noraml and the card AB tanv=o/a=AB/N, where N is the normal. v is the angle of incidence and the angle of reflection is the same. You can measure this angle. OR - Since the nomal is common to incident and reflected angle, you can make a side of length 5cm at the normal where AB is and draw this line from the normal to the edge of the card.
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #175 on: April 25, 2009, 06:51:35 pm »
do we have to draw reflected ray?
it is not clear in markscheme
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Offline astarmathsandphysics

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Re: Maths & Physics Help
« Reply #176 on: April 25, 2009, 07:18:26 pm »
Yes, it is in the question  and label it XYZ
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Offline SGVaibhav

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Re: Maths & Physics Help
« Reply #177 on: April 25, 2009, 08:19:19 pm »
Thank You
 :D
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Offline zubair_slipknot

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Re: Maths & Physics Help
« Reply #178 on: April 26, 2009, 12:17:12 pm »
hey everybody
i was having a problem in the may june paper 4 2008 question no.1 (the ratio one of Cairo and Addis Ababa)
can someone help me out in this even though i am good at maths i dunnno why i am not getting it ryt...

1(a) The scale of a map is 1:20 000 000
       On the map, the distance between cairo and Addis Ababa is 12cm.

(i)  Calculate the distance,in Km, between Cairo and Addis Ababa.

(ii)  On the map the area of a desert regionis 13 square centimetres
      Calculate the actual area of this desert region, in square Km

(b) (i) The actual distance between Cairo and Khartoum is 1580Km.
         On a diffrent map this distance is represented by 31.6cm.
         Calculate, in the form 1:n, the scale of this map.
thx for help and support if anyone can do this as soon as possible...
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Offline sweetsh

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Re: Maths & Physics Help
« Reply #179 on: April 26, 2009, 12:34:02 pm »
You dont have to post your question everywhere!
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