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Author Topic: Physics P3 27/5/2010  (Read 22415 times)

Offline Malak

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Re: Physics P3 27/5/2010
« Reply #90 on: May 24, 2010, 11:07:28 am »
Can u explain how do we find the direction an alpha or beta particle travels through magnetic feild?
And wats the basic difference between electric and magnetic field...Always confuses me :D

Thx
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Offline WARRIOR

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Re: Physics P3 27/5/2010
« Reply #91 on: May 24, 2010, 11:12:26 am »
electric field you always have two plates Positve and negative ( electric )

in this case alpha ( + ) move to the negative   / Beta ( - ) move to the posotive plate


Magenetic field

you have  2 poles.. NORTH POLE AND SOUTH pole.. THE MAGNETIC FIELD IS ALWAYS FROM NORTH TO SOUTH

This is a bit hard to find the direction but if u understand the folowing its pice of cake

We use FLEMMING LEFT HAND RULE TO FIND THE DIRECTION OF OF MOVEMENT OF WIRE  ( CONVECTIONAL CURRENT IN WIRE )
We know that electrons ( beta )  flow opposite to convectional current . And since electrons move opposite to convectional current that means alpha particles move opposite to beta . ( IN CONCLUSION )

IF YOU FIND USING FLEMMIN LEFT HAND RULE DIRECTION OF MOVEMENT  YOU FIND THE CONVECTIONAL CURRENT AND ALPHA
if you want to find movement of beta particles ..just fidn the movemnt of convectional current and and beta will move opposite.
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Offline Vin

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Re: Physics P3 27/5/2010
« Reply #92 on: May 24, 2010, 11:26:09 am »
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Offline Ivo

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Re: Physics P3 27/5/2010
« Reply #93 on: May 25, 2010, 06:18:27 pm »
OK, Kimo Jesus has asked me to post this, in response to the question found in attached file:

Quote
The answer is A, because if thicker wires are used, resistance is less, so current is less, as voltage is constant (I=V/R).

In transformers, for the same power, voltage is increased and so current has decreased, so there is less heat (I=P/V).

This is Extension material apparantly (the transformers and the grid stuff), so get learning for Paper 3 :D
« Last Edit: May 25, 2010, 06:26:30 pm by Ivo »
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Offline SoONa

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Re: Physics P3 27/5/2010
« Reply #94 on: May 26, 2010, 01:07:16 am »
Quote from: ~VIN1094~ on May 22, 2010, 02:48:33 pm
i think "quantity of charge" means "amount of charge" Coulombs

Q = It

is tht wat u mean Soona ??

YuPP exactly but the notes made it very weird... Thanks alot
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Offline Moonlyte

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Re: Physics P3 27/5/2010
« Reply #95 on: May 26, 2010, 01:18:52 pm »
does anyone have any tips? I'm finding the past papers VERY HARD :'(
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holtadit

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Re: Physics P3 27/5/2010
« Reply #96 on: May 26, 2010, 01:38:40 pm »
Quote from: Moonlyte on May 26, 2010, 01:18:52 pm
does anyone have any tips? I'm finding the past papers VERY HARD :'(

https://studentforums.biz/index.php/topic,6468.msg226756.html#new

Post you doubts there. We'll help you :)
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Offline Moonlyte

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Re: Physics P3 27/5/2010
« Reply #97 on: May 26, 2010, 01:59:07 pm »
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Offline blackberry

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Re: Physics P3 27/5/2010
« Reply #98 on: May 26, 2010, 09:17:48 pm »
PLZZZZZ HELP!!!!!!!!!!!!!!

how can we reduce power loss in relation to resistance?? decrease or increase?
and wat r de methods for changing resistance in relation to length,thickness,area,temp etc of wire?
« Last Edit: May 26, 2010, 09:33:15 pm by blackberry »
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Offline syedz123

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Re: Physics P3 27/5/2010
« Reply #99 on: May 26, 2010, 09:24:33 pm »
hey kimo...ur hv really helpd alot! i know u also hv to study bt u hv managed to also help others t0o...Thanks alot.u also helpd for chems ryt..man ur da best!!! +rep   ;)
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Offline J.Darren

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Re: Physics P3 27/5/2010
« Reply #100 on: May 27, 2010, 04:22:11 am »
Quote from: blackberry on May 26, 2010, 09:17:48 pm
PLZZZZZ HELP!!!!!!!!!!!!!!

how can we reduce power loss in relation to resistance?? decrease or increase?
and wat r de methods for changing resistance in relation to length,thickness,area,temp etc of wire?
Decrease. Power dissipated in a power cable is calculated by the equation P = I^2 R

Decreases the length, increasing the thickness, increasing the area, decreasing the temperature (metal), increasing the temperature (semiconductor) would help to reduce the temperature. A nichrome wire has more resistance than a copper wire.
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Offline Heart Hacker

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Re: Physics P3 27/5/2010
« Reply #101 on: August 25, 2010, 02:54:37 pm »
hello good work kimo jesus

i didnt read through the whole thread

but i think the notes could be a bit better organized  ::)

for example bigger fonts for the titles etc.(underlined and bold)
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elemis

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Re: Physics P3 27/5/2010
« Reply #102 on: August 25, 2010, 03:20:06 pm »
Quote from: Heart Hacker on August 25, 2010, 02:54:37 pm
hello good work kimo jesus

i didnt read through the whole thread

but i think the notes could be a bit better organized  ::)

for example bigger fonts for the titles etc.(underlined and bold)

Dude he made this a few days before the Physics exam; he didnt have the time to beautify it ::)

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Offline Heart Hacker

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Re: Physics P3 27/5/2010
« Reply #103 on: August 25, 2010, 03:22:26 pm »
OMG oh and i thot it was done recently

NICE :D
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Offline WARRIOR

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Re: Physics P3 27/5/2010
« Reply #104 on: September 11, 2010, 07:56:18 am »
yep :P ari is right ;p

Im going to make a Bio guide soon , i have to start now so i can finish by May :P
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NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa
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