Qualification > Sciences
Edexcel PHYSICS Doubts
Nobody:
--- Quote from: Romeesa-Chan on June 04, 2011, 07:46:43 pm ---Physics 6B, Sample Paper:
*Q1bii- where did 8 come from ? :S
*Q2ciii- No idea what the marking scheme says!
*Q3 a & b
*Q4 a & dii
Link: http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/Physics-Practical-Alternative-SAMs.pdf
Please help me. Have exam the next day (Monday)!!!
--- End quote ---
okay, for Q1 b
assuming you've got the part 1
the uncertainty given is 0.01 mm.
and the thickness is 15 micrometre
so the uncertainty% is
uncertainty
the value
here in this case,
it will be
0.01 mm
DIVIDED BY
8 X 15 micrometre
now convert all of them into meters.
and the answer will be
0.00001
divided by
0.00012
that is 8.333%
Romeesa-Chan:
--- Quote from: Nobody on June 05, 2011, 08:39:51 pm ---okay, for Q1 b
assuming you've got the part 1
the uncertainty given is 0.01 mm.
and the thickness is 15 micrometre
so the uncertainty% is
uncertainty
the value
here in this case,
it will be
0.01 mm
DIVIDED BY
8 X 15 micrometre
now convert all of them into meters.
and the answer will be
0.00001
divided by
0.00012
that is 8.333%
--- End quote ---
Thank you, awesomeness! :D
I am sorry, but could you help me with the Q4? Pretty please with cherry on top? :-[
Nobody:
--- Quote from: Romeesa-Chan on June 05, 2011, 08:42:12 pm ---Thank you, awesomeness! :D
I am sorry, but could you help me with the Q4? Pretty please with cherry on top? :-[
--- End quote ---
Q 4. okay..i'll answer that
hey, you know how you got 8 in Q 1 b (i) right?
don't hesitate. ;)
Romeesa-Chan:
--- Quote from: Nobody on June 05, 2011, 08:59:18 pm ---Q 4. okay..i'll answer that
hey, you know how you got 8 in Q 1 b (i) right?
don't hesitate. ;)
--- End quote ---
Hmmm . . . Nope. :$
I asked my friend and she told me that we must always use 8 for folding. :/
Nobody:
--- Quote from: Romeesa-Chan on June 05, 2011, 09:06:06 pm ---Hmmm . . . Nope. :$
I asked my friend and she told me that we must always use 8 for folding. :/
--- End quote ---
no, i guess she's wrong here.
--- Quote ---(b) An aluminium cooking foil manufacturer states that the thickness of the foil is 15 ?m.
You have a micrometer which can read to a precision of 0.01 mm.
(i) Describe how you would try to find an accurate value for the thickness of a sheet
of the foil.
--- End quote ---
Now, look the precision of micrometer is 0.01 mm. so that's the LEAST value it can read.
and, since the sheet is 15 MICROMETER, we first convert this into milimeter
15 micrometers = 0.015 millimeter
now, we need to fold the sheet so that the screw gauge(micrometer) can be used to read it.
so, try the following
fold the sheet into 2 > 0.015 x 2 > 0.03
fold the sheet into 5 > 0.015 x 5 > 0.075
fold the sheet into 7 > 0.015 x 7 > 0.105
fold the sheet into 8 > 0.015 x 8 > 0.2
since the one in bold is close to the precision of micrometer (0.01) we fold that sheet 8 times and read the value
why we don't take 7 folds > 8 is easier and taking 7 will be too close to the precision of micrometer (0.01).
therefore. 8 ;D
get it? ;)
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