Qualification > Sciences
Edexcel PHYSICS Doubts
Romeesa-Chan:
--- Quote from: Nobody on June 05, 2011, 09:20:23 pm ---no, i guess she's wrong here.
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? ;)
--- End quote ---
But. . . 0.015 x 8 = 0.12 :S
Romeesa-Chan:
June 2010, Q2v
Why do we multiply them both with 2? :S
Romeesa-Chan:
Mark scheme answer ^^
Nobody:
--- Quote from: Romeesa-Chan on June 05, 2011, 09:26:45 pm ---But. . . 0.015 x 8 = 0.12 :S
--- End quote ---
haha! typo! :P
i wanted to type 0.12 but typed 0.2 instead :P
Romeesa-Chan:
--- Quote from: Nobody on June 05, 2011, 09:33:25 pm ---haha! typo! :P
i wanted to type 0.12 but typed 0.2 instead :P
--- End quote ---
;)
By the way, did you try the other question? :D
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