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Physics: Post your doubts here!

TaffsAsLevel

TaffsAsLevel

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Soldier313 said:
hey
Thanx for the answers.

i know the qns i asked seem relatively simple, but the problem is this for the first 2, i wanted to compare my diagrams with drawn ones from someone else.
For the third qn i asked, i attempted using the left hand rule, but somehow i just couldn't figure out the answer

For the last qn i asked, the torque thing, i couldn't figure out why we were using the length 2.8 rather than 4.5

I will look at the qns again though. Thanx a lot for your help.
Click to expand...

Mind helping me with June 2002 for alternating current?
 
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fakibaz

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I have my paper 3 practicals coming up and i am very confused about the significant numbers and decimal places to be used !! I've heard that for raw data we keep the decimal places same while for calculated data we keep the significant numbers same. Is it so? And also calculated data are same or one more sf than raw data.Then what if i have raw data readings in 2 sf and 3 sf both but both are in same dp...what sf will i choose for calculated data?!!
 
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aleezay

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fakibaz said:
I have my paper 3 practicals coming up and i am very confused about the significant numbers and decimal places to be used !! I've heard that for raw data we keep the decimal places same while for calculated data we keep the significant numbers same. Is it so? And also calculated data are same or one more sf than raw data.Then what if i have raw data readings in 2 sf and 3 sf both but both are in same dp...what sf will i choose for calculated data?!!
Click to expand...
Yes you are right.. go for 3sf if thats the case. Since calculated values must have the same no./one more no. of sf as compare to that of raw data.. :)
 
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aleezay

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For P3, the part on percentage uncertainty troubles me alot.. If we measure two values, each with uncertainty .1cm, and calculate their average, would the absolute error in the calculated value be .2 or .1? Also, if the diameter of a tube has an uncertainty of .1cm, what would be the uncertainty in the radius? .1cm? Thirdly, how would we know if we are to give angles to the nearest degree or to half a degree? Is there some set rule? Please help me with this asap. Thanks in advance :)
One more thing: Would they take away the apparatus for q1 after an hour or would we have both sets of apparatus till the end? And any tips for the paper?
 
Osaid Zahid

Osaid Zahid

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AOA
Can someone answer my query.... Light is made of photons (packets of energy) right and is Wave also a part of electromagnetic spectrum ... So are all types of waves within the electromagnetic spectrum made of photons ? Or what is exactly an electromagnetic wave . How might electrons , energy or photons be made into a wave .
O'L student.
 
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fakibaz

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aleezay said:
For P3, the part on percentage uncertainty troubles me alot.. If we measure two values, each with uncertainty .1cm, and calculate their average, would the absolute error in the calculated value be .2 or .1? Also, if the diameter of a tube has an uncertainty of .1cm, what would be the uncertainty in the radius? .1cm? Thirdly, how would we know if we are to give angles to the nearest degree or to half a degree? Is there some set rule? Please help me with this asap. Thanks in advance :)
One more thing: Would they take away the apparatus for q1 after an hour or would we have both sets of apparatus till the end? And any tips for the paper?
Click to expand...
if you calculate the average the absolute value would still stay .1cm also for diameter and radius it will be the same absolute error...this is because you are using the same instrument for measurig the values. i dont know about the angle though :confused: ..and they'll take the apparatus after an hour as far as i have heard :)
 
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aleezay

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fakibaz said:
if you calculate the average the absolute value would still stay .1cm also for diameter and radius it will be the same absolute error...this is because you are using the same instrument for measurig the values. i dont know about the angle though :confused: ..and they'll take the apparatus after an hour as far as i have heard :)
Click to expand...
But ive come across several marking schemes in which they take the uncertainty of the averaged value as .2.. but at the same time there are many others in which they take it as .1.. pretty confused.. :/
 
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