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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 199420 times)

Offline the_grim_reaper

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #330 on: May 09, 2010, 09:05:55 pm »
Quote
ou place (stick) the pin horizontally, coinciding the mark on the ruler .. u place the cylinder over the pin .. u want me to show u a drawing ??

Yep I've got it thank you but I still don't get 1 very little thing. How does it prove that the centre is on the 10 cm mark?? :P
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #331 on: May 09, 2010, 09:06:57 pm »
Quote from: SEL123 on May 09, 2010, 08:52:38 pm
Can someone PLEASE help me with may june 06 PAPER 6 PHYSICS igcse

QUestion 3
V- "Extend the straight line EF within the outline of the block to a point I. The distance FI must be exactly equal to b"
Whaaaaaaaaaaat?
b = FH
H --> p3 and p4 extended to the block
if you can explain the rest of the questions on this page I'd really appreciate it
How can FH and FI be equal
I don't get it
I attached it here


HERE .. temme if u wan nythin more ..  :)
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Offline SEL123

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #332 on: May 09, 2010, 09:08:39 pm »
But if you measure HF and FI they're not equal...
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #333 on: May 09, 2010, 09:09:48 pm »
Quote from: deadman786 on May 09, 2010, 09:05:55 pm
Yep I've got it thank you but I still don't get 1 very little thing. How does it prove that the centre is on the 10 cm mark?? :P

for tht u mark a centre line (diameter) of the cylinder if u wan .. so the pin n the diameter sld coincide .. view frm 90o to avoid parallax error .. ;)
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #334 on: May 09, 2010, 09:11:27 pm »
Quote from: SEL123 on May 09, 2010, 09:08:39 pm
But if you measure HF and FI they're not equal...

ya so u hatva draw them in a manner so tht they are equal .. i cant do tht on the comp .. 
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #335 on: May 09, 2010, 09:13:18 pm »
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Offline SEL123

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #336 on: May 09, 2010, 09:14:17 pm »
And for getting the gradient they say :
triangle method seen [1]
More than ½ line used [1]
Gradient value correct
"triangle method seen [1]", is that y2-y1/x2-x1??


But its not possible for them to be equal...
If FI touches the line..its going to be longer
I was thinking possible that FI would be = b (4.3 cm)
And by that, it would reach a bit after the midpart of the block
Would that be wrong..?

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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #337 on: May 09, 2010, 09:19:29 pm »
Quote from: ang3l on May 09, 2010, 08:52:11 pm
Can anyone explain The sliding contact thing...Like placing it in which position increases/decreases resistance bla bla...
Thx alot :D

A has  more resistance .. winter 06 paper6 .. :P
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #338 on: May 09, 2010, 09:29:52 pm »
Quote from: SEL123 on May 09, 2010, 09:14:17 pm
And for getting the gradient they say :

I was thinking possible that FI would be = b (4.3 cm)
And by that, it would reach a bit after the midpart of the block
Would that be wrong..?


wat gradient r u talkin abt ??

nyway .. i drew on paper right now .. its possible .. its too near to G tho .. n FI is supposed to be equal to B ..
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Offline the_grim_reaper

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #339 on: May 09, 2010, 09:41:08 pm »
Quote
for tht u mark a centre line (diameter) of the cylinder if u wan .. so the pin n the diameter sld coincide .. view frm 90o to avoid parallax error ..


THank you so much!!!! + rep! I am very thankful to you! Just one more question. I'll get a mark for this right??? :D.
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #340 on: May 09, 2010, 09:52:46 pm »
Thx Sel...
@ Vin....Hehe i knew tht answer but was jst making sure abt the sliding contact stuff..But thx nyway:P
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #341 on: May 09, 2010, 09:56:12 pm »
Quote from: ang3l on May 09, 2010, 09:52:46 pm
Thx Sel...
@ Vin....Hehe i knew tht answer but was jst making sure abt the sliding contact stuff..But thx nyway:P

i thought so .. id seen u answering in the past n ur smart .. so even i didnt care much to ans jus pasted a diag.. :P lol
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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #342 on: May 10, 2010, 02:42:12 am »
cn any1 answer this plz?
 ??? give 2 reasons why the fulcrum should have a sharp edge!!!
i dnt hve ms for this  cos its 2 old <may 1992> ;)
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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #343 on: May 10, 2010, 03:03:12 am »
chk out de diag 4 de ques abv  ::)
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Offline nizzy

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #344 on: May 10, 2010, 03:18:48 am »
The cylinder completely covers the marks on the metre rule. Describe, with the aid of
a diagram, how you would judge that the centre of the cylinder is directly above the
10.0 cm mark.

I saw this type of questions some other places, this was s08 in paper 6, and the MS only says: (b) clear explanation/diagram [1]

So, what would be the diagram/explanation ?
Thank you.
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