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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 228417 times)

Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #705 on: May 10, 2010, 06:16:26 pm »
Quote from: Adzel on May 10, 2010, 06:11:25 pm

Its a rule which u use to check if an object is Perpendicular or wtte :P





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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #706 on: May 10, 2010, 06:20:54 pm »
Explain more with an aid of a diagram please...
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Offline Hesham Mhd

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #707 on: May 10, 2010, 06:22:15 pm »
Hi, in the questions of lenses, the object should be inverted and magnified? or just inverted without being magnified?
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Offline Baladya

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #708 on: May 10, 2010, 06:23:02 pm »
Quote from: Baladya on May 10, 2010, 06:02:19 pm
"An electron beam is equivilent to an electric current, but without the wire. It can bla bla bla.... In this diagram, the magnetic field is at right angles to the electron beam, so the beam is deflected."
This is what my book says... but how come the electrons go down (srry for bad quality). If u use Flemingooo's left hand rule, the current is ur middle finger(so points to the left [direction of electrons]), the field is ur second finger (pointing into the paper[direction of magnetic field]) and so ur thumb will be pointing up, which shows how the electrons will be deflected...How come they show it going down?

Cmon guys helpsss :D
Thanks ;)
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #709 on: May 10, 2010, 06:25:31 pm »
Quote from: Adzel on May 10, 2010, 06:20:54 pm
Explain more with an aid of a diagram please...

Umm...For example...Here to make sure that the rule correctly positioned

http://img3.imageshack.us/img3/8131/76681659.png

U get it??
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Offline Adzel

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #710 on: May 10, 2010, 06:27:52 pm »
Ohw know I get it...Thanks
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #711 on: May 10, 2010, 06:28:45 pm »
Umm, in May/June 2001, Q4, part (b),
What is the main question? :S
Why the glass stopper was heated?
Why it was heated for a long time?
Or, why was it heated in boiling WATER?

I mean, where does the emphasis lie?

If they meant long time, then obviously so that evenly and completely, the glass stopper fully reaches 100 deg. C, i.e as it has a hight sp. ht. capacity and may take longer.
If, why specifically in boiling WATER and not directly, well because, the glass would crack on direct contact with the heater.
What exactly is the ans? MS, anyone?

Also, the same question, part (e), is the answer:
This is because it has a greater size and thus greater mass comparatively, and thus has a higher thermal capacity and so will gain more internal energy, and transfer more of it to the water as compared to the smaller one.

That is the answer I wrote. Kindly correct! :)
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #712 on: May 10, 2010, 06:30:42 pm »
Hey guys, I would be very grateful if you could answer my query.

on 0625/05/O/N/09 Q.2 iv) Where I have to record the temp. readings, in the mark scheme it says temperatures decreasing - does that mean I won't get the mark if one of them is the same e.g. 85, 84, 83, 83, 81, 81, 80, 79.  Therefore, does it mean all the temp. readings have to be decreasing, and so I won't get the mark in the example above?

Also, for the last marking point for that question, where it says "evidence of temperatrues to 1 degrees" does that mean I shouldn't right 37.5 degrees?

Here are the links to the papers and MS:

http://www.xtremepapers.net/CIE/Cambridge%20IGCSE/0625%20-%20Physics/0625_w09_qp_5.pdf

http://www.xtremepapers.net/CIE/Cambridge%20IGCSE/0625%20-%20Physics/0625_w09_ms_5.pdf

Many thanks in advance!
« Last Edit: May 10, 2010, 06:35:36 pm by iwilliams »
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #713 on: May 10, 2010, 06:47:13 pm »
Wow. When I need help, everyone disappears.
I helped so many of you! :O

ANSWER my post, Please! :P
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Offline TheLonelyIsland

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #714 on: May 10, 2010, 07:13:02 pm »
One more question plz... say you have three bulbs set in parallel, and you needed to measure the p.d. across the lamps, as in all of them at the same time, with one voltmeter... How do we connect the voltmeter?

Thx!! ;)
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Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #715 on: May 10, 2010, 07:17:46 pm »
In parallel to the entire circuit, just as you connected the lamps.
I.e, either at the bottom, or at the top, but in parallel to the whole thing, for all three lamps.

|               |
|_ _ (X) _ _ |
|                |
|_ _ (X) _ _ |
|                |
|_ _ (X) _ _ |
|               |
|_ _ (V) _ _ |
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Offline TheLonelyIsland

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #716 on: May 10, 2010, 07:27:05 pm »
Thx so much Shazizzzle!!!
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Offline princess12

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #717 on: May 10, 2010, 07:30:24 pm »
what we should take wiyh us for exam of physics  ??? ???
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Offline Malak

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #718 on: May 10, 2010, 07:33:25 pm »
Quote from: princess12 on May 10, 2010, 07:30:24 pm
what we should take wiyh us for exam of physics  ??? ???
As in equipment / stationery??
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Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #719 on: May 10, 2010, 07:42:17 pm »
I have one question.. you guys know for the questions where they tell you the cylinder placed on the rule covers the mark..
should you draw the rule and the cylinder and mark the center of the cylinder AND THEN DRAW ANOTHER Rule under it to measure the distance or the diagram without extra ruler is enough?
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