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Author Topic: Physics Help HERE ONLY !!  (Read 75590 times)

Offline Hope

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Re: Physics Help HERE ONLY !!
« Reply #750 on: June 09, 2009, 11:20:20 am »
I drew a rough sketch of a wave, and tried to visualise that..So, isn't it like having a horizontal line, that is as high as the amplitude?
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Offline cockyxrocker

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Re: Physics Help HERE ONLY !!
« Reply #751 on: June 09, 2009, 11:32:39 am »
hey can anyone explain diodes and bridge connection
Thanks
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Offline winnie101

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Re: Physics Help HERE ONLY !!
« Reply #752 on: June 09, 2009, 11:35:11 am »
hi,
can anyone tell me the reasoning behind q31, o/n 2006 pap1. the is supposed 2be D
thx
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Offline winnie101

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Re: Physics Help HERE ONLY !!
« Reply #753 on: June 09, 2009, 12:04:57 pm »
also q31 m/j 2006 it is supposed to be C
thx
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Offline sweetie

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Re: Physics Help HERE ONLY !!
« Reply #754 on: June 09, 2009, 12:05:40 pm »
hi
ineed help in p1 oct06 que.33
i think it should b B but mark scheme says its A????
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Offline winnie101

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Re: Physics Help HERE ONLY !!
« Reply #755 on: June 09, 2009, 12:14:35 pm »
RESISTANCE is proportional to 1/cross sectional area. so if u decrease the cross sectional area, the resistance inc, if u increase the cross sectional area resistance decreases, thats why its A
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Offline 7ooD

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Re: Physics Help HERE ONLY !!
« Reply #756 on: June 09, 2009, 02:22:41 pm »
in addition to winnie when the resistance increase temperature increase so over here we need low resistance
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Offline theigstudent

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phy pap 1 here
« Reply #757 on: June 09, 2009, 05:45:37 pm »
could some 1 tell me what is the threshold  4 A


The half-life of a radioactive substance is 5 hours. A sample is tested and found to contain 0.48 g
of the substance.
How much of the substance was present in the sample 20 hours before the sample was tested?
A 0.03 g
B 0.12 g
C 1.92 g
D 7.68 g

wats the answer 4 this n how do u find it
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<3 datz da way it izzzzzzzzzz <3

Offline Ghost Of Highbury

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Re: phy pap 1 here
« Reply #758 on: June 09, 2009, 05:47:27 pm »
20/5 = 4

0.48 * 4 = 1.92 g
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Offline Tanya

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Re: phy pap 1 here
« Reply #759 on: June 09, 2009, 05:48:20 pm »
me tooo wanna know the answer i couldnt do it anyone cam help us????????????????1
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Offline theigstudent

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Re: phy pap 1 here
« Reply #760 on: June 09, 2009, 05:49:27 pm »
Quote from: eddie_adi619 on June 09, 2009, 05:47:27 pm
20/5 = 4

0.48 * 4 = 1.92 g

sorry but in the ms the ans was D
so plz help
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Offline Ghost Of Highbury

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Re: phy pap 1 here
« Reply #761 on: June 09, 2009, 05:49:54 pm »
ohh..
ill try again

which paper is this????
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Offline basoom16

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Re: phy pap 1 here
« Reply #762 on: June 09, 2009, 05:50:29 pm »
how can it be D??
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Offline basoom16

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Re: phy pap 1 here
« Reply #763 on: June 09, 2009, 05:51:50 pm »
it has to be C
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Offline Ghost Of Highbury

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Re: phy pap 1 here
« Reply #764 on: June 09, 2009, 05:52:58 pm »
ohhkk.got it

5 hours before it was = 0.48 * 2 = 0.96
10 hours before it was = 0.96 * 2 = 1.92
15 hours before it was = 1.92 * 2 = 3.94
and 20hours it was = 3.84 * 2 = 7.68 = D
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