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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 199427 times)

Offline ginger

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1305 on: May 25, 2010, 04:43:57 pm »
hay guys
plz help me with this..............Q11 and Q32 nov 2008 paper1.....
urgent plzzzzzzzzz
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Offline ambitious94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1306 on: May 25, 2010, 04:44:41 pm »
Quote from: diva_sparkles on May 25, 2010, 04:42:22 pm
its B
That I figured from the mark scheme....HOWWWWWWW!
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1307 on: May 25, 2010, 04:45:16 pm »
Quote from: rhea on May 25, 2010, 04:30:30 pm
Some changes are made, one at a time.
• The d.c. supply is reversed.
• The coil is turned before switching on, so that P starts on the right and Q on the left.
• The poles of the magnet are reversed.
• The turns on the coil are increased in number.
How many of these changes make the coil rotate in the opposite direction?
A 1
B 2
C 3
D 4

which paper ?? is there a diag. given ??
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Offline Raywin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1308 on: May 25, 2010, 04:45:45 pm »
Quote from: jellybeans on May 25, 2010, 04:41:57 pm
.... :o sryyyyy my brain isnt really absorbing much atm... so uh sry so why is teh no wait, Xp ummm how does the diagram show where the waves are traveling? D: ......sry

Lol.. :) the wavefront is shown (the weird line around the X) so where ever any options are NEAREST to this line is the ans.
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;D

Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1309 on: May 25, 2010, 04:46:19 pm »
Rhea which question paper is your question from? about the changes done to the coil
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1310 on: May 25, 2010, 04:46:32 pm »
Quote from: diva_sparkles on May 25, 2010, 04:42:22 pm
its B

yes its B, because its potentiometer. thats how a circuit is drawn with a potentiometer, wait ill get a diagram for u
« Last Edit: May 25, 2010, 04:51:16 pm by A@di »
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Offline jellybeans

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1311 on: May 25, 2010, 04:47:13 pm »
Quote from: Raywin on May 25, 2010, 04:45:45 pm
Lol.. :) the wavefront is shown (the weird line around the X) so where ever any options are NEAREST to this line is the ans.

ohhh, haha okay. thanks! ;)
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Offline Raywin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1312 on: May 25, 2010, 04:48:15 pm »
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Offline MasterMath

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1313 on: May 25, 2010, 04:48:49 pm »
Quote from: rhea on May 25, 2010, 04:30:30 pm
Some changes are made, one at a time.
• The d.c. supply is reversed.
• The coil is turned before switching on, so that P starts on the right and Q on the left.
• The poles of the magnet are reversed.
• The turns on the coil are increased in number.
How many of these changes make the coil rotate in the opposite direction?
A 1
B 2
C 3
D 4
Which paper is this? anyone?
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1314 on: May 25, 2010, 04:49:02 pm »
Quote from: ginger on May 25, 2010, 04:43:57 pm
hay guys
plz help me with this..............Q11 and Q32 nov 2008 paper1.....
urgent plzzzzzzzzz

Q11 =  Its dropped from 2m right ? So when it hits the ground some energy will be lost, so it cant bounce up to 2m again can it ? Ofc not.

So it has to be D.


Q32 = see below. THE red arrows represent VERY HIGH CURRENT. Only in once case the fuse blows and protects ALL the lamps.
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Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1315 on: May 25, 2010, 04:49:25 pm »
Quote from: ginger on May 25, 2010, 04:43:57 pm
hay guys
plz help me with this..............Q11 and Q32 nov 2008 paper1.....
urgent plzzzzzzzzz

Q11=D, This is because the ball cannot have the same Gravitational Potential energy as it started or more hence it cant be A,B,C.
Q32=D, This is because in A the fuse protects northing, in B only the first lamp, in C only the 2nd lamp, in D it protects both.

Hope it helps :)
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Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1316 on: May 25, 2010, 04:50:17 pm »
Lol My bad Ari, didn't see any one answered him.
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Offline red_911

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1317 on: May 25, 2010, 04:51:00 pm »
i want help in question 16 0625/11/M/J/09  :-X
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1318 on: May 25, 2010, 04:52:17 pm »
No one has explained to me why may june 05 q 32 is B  ?
Link:http://www.freeexampapers.us/IGCSE/Physics/CIE/2005%20Jun/0625_s05_qp_1.pdf
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Offline Vin

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1319 on: May 25, 2010, 04:52:28 pm »
Quote from: ginger on May 25, 2010, 04:43:57 pm
hay guys
plz help me with this..............Q11 and Q32 nov 2008 paper1.....
urgent plzzzzzzzzz

11) D .. they say energy is "lost" in th form of heat .. so the ball doesnt have that much of energy left to match the original position

remember always a body undergoing a free fall NEVER exceeds its starting position .. here it NEVER  exceeds C

32) D again .. ;ets look at A .. fuse in parallel so protects neither of the lamps .. in B only one lamp is protected and also in C only one lamp is protected .. in D the fuse is placed in "beginning" of the circuit so both are protected
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