Qualification > Sciences
Physics Prac Sig Figs
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 29, 2010, 02:21:16 pm ---"But if you are estimating the height, then you should take uncertainty to be between 0.02 - 0.05."
Don't you mean 0.002 - 0.005?
--- End quote ---
Nope..........i said it right!
You cannot estimate in millimetres.Our eyes are not powerful enough :P
Estimates are between 2cm and 5cm. ;)
$!$RatJumper$!$:
That doesnt make sense to me :/ If you are taking your uncertainty to be 0.001 for a normal ruler reading, it makes sense that an estimation of height should make you add about 0.001 to your uncertainty making it 0.002.
If you look at oct/nov 09 31 question 2(b)(iii) you will see what i mean.
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 29, 2010, 02:37:23 pm ---That doesnt make sense to me :/ If you are taking your uncertainty to be 0.001 for a normal ruler reading, it makes sense that an estimation of height should make you add about 0.001 to your uncertainty making it 0.002.
If you look at oct/nov 09 31 question 2(b)(iii) you will see what i mean.
--- End quote ---
Let's say you drop a ping-pong ball from a height of 1m from ground and you're asked to measure the height the ball reaches after the first rebound.
It's obvious that you won't be able to measure the exact value since the ball will reach there and instantaneously drop. Hence you should be estimating the maximum height.
Believe me, you won't be able to read the maximum height in millimetres. That's why the uncertainty is taken as 2cm - 5cm.
I'll take a look at the paper and let you know my opinions asap ;)
$!$RatJumper$!$:
Ok what u say makes sense .. .but according to what i can make out of the question paper, it tells me otherwise. anyways it would be gr8 if you could check it out and let me know what you think.
Deadly_king:
--- Quote from: $!$RatJumper$!$ on October 29, 2010, 05:40:57 pm ---Ok what u say makes sense .. .but according to what i can make out of the question paper, it tells me otherwise. anyways it would be gr8 if you could check it out and let me know what you think.
--- End quote ---
Damn it!.......My bad :-[
How could I be so silly.........5cm is way too long for uncertainty.
In fact for the question, uncertainty should be 5mm.
c)(iii) 0.005/d x 100
Am really sorry for the confusion dude. All the uncertainties for estimates are taken to be 5mm and not 5cm. :-[
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