Qualification > Sciences
physics help needed........plz
Deadly_king:
--- Quote from: Ari Ben Canaan on October 02, 2010, 04:06:17 pm --- equation 1
adding the fractional uncertainties :equation 2
Hence, multiplying 1 and 2 gives an absolute uncertainty of 0.2
Therefore, ans =
--- End quote ---
Well done Ari.....except that the units are g/cm3 :P
elemis:
--- Quote from: Deadly_king on October 02, 2010, 04:12:45 pm ---Well done Ari.....except that the units are g/cm3 :P
--- End quote ---
I did that purposely because I wanted to see of you were paying attention :P
I was doing chem all this time..... concentrations and all :D
Deadly_king:
--- Quote from: Ari Ben Canaan on October 02, 2010, 04:18:05 pm ---I did that purposely because I wanted to see of you were paying attention :P
I was doing chem all this time..... concentrations and all :D
--- End quote ---
Haha........take it as if I believed ya :P
Yeah......i know you have loads on your head.....just chill and relax a bit dude :)
ashwinkandel:
i looked up the marking scheme. it was given like this:
(answer 2.69 ± 0.09 g cm-3 scores 4 marks).
Can anyone teach me about the use of significant figures while solving the problems like the above one.
Deadly_king:
--- Quote from: ashwinkandel on October 02, 2010, 04:38:20 pm ---i looked up the marking scheme. it was given like this:
(answer 2.69 ± 0.09 g cm-3 scores 4 marks).
Can anyone teach me about the use of significant figures while solving the problems like the above one.
--- End quote ---
Hmm.....this question carries 5 marks.
Ok........the values given to you and which you used in your calculations were 580g and 6.0cm.
In both cases the values were correct to 2 significant figures.
NOTE : The 0 in 580 is not considered as a significant figure but the one in 6.0 is considered as one. In decimals a zero in front of the other numbers is not considers as a significant figure (Example 2) but a zero after the decimal point which has a number in front is a significant figure.(Example 3)
Examples :
1. Express 5.89 correct to 2 sf ---> 5.9
2. Express 0.00875 correct to 2sf ---> 0.0086
3. Express 1.99 correct to 2 sf ---> 2.0
Hope it helps :)
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