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Physics Practical ( Paper 3 ) Tips :)

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*Hope*:

--- Quote from: Spy on May 21, 2010, 06:09:38 pm ---your welcome :D

where's the +rep? :P

--- End quote ---
i did give u one but dunno y not appearing
anywayz i'll give u another 1 after 2 hours have passed :D
listen do u noe how to calculate the uncertainties?? ???

[Spy]:
lets say you have to record the time taken for a pendulum to stop swinging, you should repeat each twice for each length..

for example, your recording the time taken for a 0.5 meter pendulum to stop, then you time it once, and twice. you get 10.51 and 10.75 then find find the average and use this as the time value for the length of 0.5 meter :)

then do the same for your other lengths

hope its clear? :)

[Spy]:

--- Quote from: without a name on May 21, 2010, 06:28:22 pm ---i did give u one but dunno y not appearing
anywayz i'll give u another 1 after 2 hours have passed :D
listen do u noe how to calculate the uncertainties?? ???


--- End quote ---

oh probably takes time to show, haha thanks :D

yeah its easy, the key is you ALWAYS add them, and they should be in PERCENTAGE Form. these two things are very important.

for example lets say you have the equation.Q=A*B^2 all over C^1/2

and A=1.3mm +/- 0.02
B= 2.8mm +/- 0.01
C= 0.8mm +/- 0.008

convert all to percentages first! for example A= 0.02/1.3 * 100 and do the rest for B and C
lets say for example you get A=1% and B=2% and C=1% (im too lazy to calculate :P)
so you plug them into the equation.
AND YOU ALWAYS ADD. but before that, any thing to the power of X, in uncertainties you multiply by the power. (because your adding them twice for instance if its squared you multiply by 2)
so for our equation. its 1+(2*2*(the power)) + 1*0.5(the power) as you can see its always ADD no matter what the equation is.

so your uncertainty is 1+4+0.5=5.5%. and if you want to find it as a value of the actual result. then use this equation. X/the value= 5.5/100

i hope its clear :D
                                       

unknown 101:

--- Quote from: Spy on May 21, 2010, 06:40:13 pm ---oh probably takes time to show, haha thanks :D

yeah its easy, the key is you ALWAYS add them, and they should be in PERCENTAGE Form. these two things are very important.

for example lets say you have the equation.Q=A*B^2 all over C^1/2

and A=1.3mm +/- 0.02
B= 2.8mm +/- 0.01
C= 0.8mm +/- 0.008

convert all to percentages first! for example A= 0.02/1.3 * 100 and do the rest for B and C
lets say for example you get A=1% and B=2% and C=1% (im too lazy to calculate :P)
so you plug them into the equation.
AND YOU ALWAYS ADD. but before that, any thing to the power of X, in uncertainties you multiply by the power. (because your adding them twice for instance if its squared you multiply by 2)
so for our equation. its 1+(2*2*(the power)) + 1*0.5(the power) as you can see its always ADD no matter what the equation is.

so your uncertainty is 1+4+0.5=5.5%. and if you want to find it as a value of the actual result. then use this equation. X/the value= 5.5/100

i hope its clear :D
                                       

--- End quote ---

didnt understand anything!!!  ;D

[Spy]:
HAHAHAHAHAHAHA NASHAT, GO STUDY

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